The RX 6000 series Owners' Club

[LeonIncognito]

I have a 6600XT which I seriously enjoyed for the price at the time ($425) and with my 1080p monitor. It performed very well at that resolution, high or max and 120fps on games only a few years ago. 60fps max settings with newest games. However, AMD cards are permanently compromised with DirectX 9 games like Far Crys, Assassin´s Creed and even Hat in Time. Framerates would be all over the place no matter the settings. AMD just made bad drivers and never addressed it.

Unfortunately, when I moved to Intel 12th and a new board, I had so many driver problems I decided to jump ship when I snagged a 3070 Ti at Best Buy.

 

[nolive721]

Hello everyone,

would another move from my current 6600XT to a 6600 model be a wise thing to do?

I bough the XT a month ago for under $550 and I see a Sapphire Pulse 6600 for around $470 here where I live.

looks like its the same chip and memory bus, only Clocks and TDP is different so I was wondering if a bit of MPT help and OCing I could get such 6600 very close to my 6600XT

I play on a UW 1440p Freesync and my GPU is heavily UVed but still get happily above the low range of my monitor Freesync so I don't mind if I get just 2 to 3fps less with the 6600

thanks in advance for the feedback including if you think I am nutts lol)

 

[Space Lynx]

I have a 6600XT which I seriously enjoyed for the price at the time ($425) and with my 1080p monitor. It performed very well at that resolution, high or max and 120fps on games only a few years ago. 60fps max settings with newest games. However, AMD cards are permanently compromised with DirectX 9 games like Far Crys, Assassin´s Creed and even Hat in Time. Framerates would be all over the place no matter the settings. AMD just made bad drivers and never addressed it.

Unfortunately, when I moved to Intel 12th and a new board, I had so many driver problems I decided to jump ship when I snagged a 3070 Ti at Best Buy.

did you get the 3070 ti in person at best buy?

 

[LeonIncognito]

No, online. They were dropping several models spaced apart and I was missing them all near the end despite being in the queue. Got the 3070 Ti, though I really wanted a 3080 because 8GB seems to already not be enough for some games texture settings.

 

[nolive721]

is MPT on RX GPUs if you are on latest RADEON drivers? I received a RX6600 today and its Power limit is locked at 120W ( where TDP is meant to be 132W by the way) and changing this in MPT, write SPTT table and restarting my PC don't make any sort of difference.

any help appreciated

 

[Felix123BU]

is MPT on RX GPUs if you are on latest RADEON drivers? I received a RX6600 today and its Power limit is locked at 120W ( where TDP is meant to be 132W by the way) and changing this in MPT, write SPTT table and restarting my PC don't make any sort of difference.

any help appreciated

As far as I see there is no mention of 6600 support on the MPT version page, could be wrong though. Even if its not supported just now, it might be in future or in the latest beta versions. I would check the latest beta, even though that too does not mention support for the 6600.

Anyway, love MPT, best tool for AMD cards ever

 

[nolive721]

As far as I see there is no mention of 6600 support on the MPT version page, could be wrong though. Even if its not supported just now, it might be in future or in the latest beta versions. I would check the latest beta, even though that too does not mention support for the 6600.

Anyway, love MPT, best tool for AMD cards ever

thanks for the heads up as you are right, stable version dont capture RX6600 or 6600XT. I tried Beta version on both and you can override things like Voltage and Power in MPT but then the RADEON drivers would not allow you to go beyond the 20% power increase.

I can see the Voltage slider being updated (I had set move from 1150mV to 1175mV) but it doesn't do anything for power headroom to the GPUs unfortunately, again unless I am not using it properly (I played with my 6700XT last year and it was working well)

But anyway, for the sake of science and people who are considering a 6600 vs 6600XT, I did quite few back to back comparison as shown below in details.
My conclusion is the 6600XT is the better card at so much more efficient to achieve same FPS in benchmark or Games tested (almost 50W!!!!) and it will have the extra performance I will need to drive my 2 different monitor set-up with future AAA titles

Heaven is 1080p and all Graphics are Maxed out in the 2 Games tested, including heavy modding in AC

Detailed results here

RX6600 powercolor hellhound

Undervolt/OC 2555Mhz CORE 1.097V Memory 1750Mhz(fast) 101.5FPS 110W
DEFAUT all stock 98FPS
OVERCLOCK 2730Mhz Core 1.15V Memory 1862Mhz 103.9FPS 120W

BENCHMARKS

ASSETTO Triple 1080p
UV 73fps CPU use 70% 108W
DEFAULT 71fps CPU use 68% 105W
OC 75fps CPU 72% 129W


RX6600XT SAPHIRRE NITRO+

Undervolt 2188Mhz CORE 1.062V 103FPS Memory 200Mhz 75W
DEFAULt all stock 116FPS
OVERCLOCK 2965Mhz Core 1.15V Memory 2150Mhz 126FPS 148W

BENCHMARKS

ASSETTO Triple 1080p
UV 75fps CPU use 63% 75W
DEFAULT 84fps CPU use 70%
OC 90fps CPU 74% 144W

SHADOW TOMB Triple 1080p
UV 43fps Frame 6730
DEFAUT 48fps Frame 7516
OC 49fps Frame 7628

ASSETTO UW 1440P
UV 68fps CPU use 56% 71W
DEFAULT 75fps CPU use 61%
OC 81fps CPU 67% 146W

SHADOW TOMB UW 1440P
UV 58fps Frame 9000
DEFAUT 62fps Frame 9650
OC 65fps Frame 10250

 

[Fatal Fighter]

Soo, I could not help myself and purhased second Gigabyte RX6900XT Xtreme Waterforce, as it was $1500 for a brand new one.
I always had concerns regarding my first Gigabyte RX6900XT's temperatures, I am easily hitting 50-55 while playing RDR2 for example, which seemed kinda high to me.
Now, this example I purchased lately runs 12-13 degrees cooler, soo should I disassmeble the hot card and change thermal paste and tighten it harder? I do not believe such difference is just silicon lottery.
Barely ran TimeSpy GT1 (1000W platinum PSU is def. not enough for these guys, upgrading to 1500 tomorrow) and power draw and frequencies are kinda same, but 12-13 difference is bugging me a lot

Edit: actually it is even 15C difference

Spoiler: IMGs

 

[Felix123BU]

Soo, I could not help myself and purhased second Gigabyte RX6900XT Xtreme Waterforce, as it was $1500 for a brand new one.
I always had concerns regarding my first Gigabyte RX6900XT's temperatures, I am easily hitting 50-55 while playing RDR2 for example, which seemed kinda high to me.
Now, this example I purchased lately runs 12-13 degrees cooler, soo should I disassmeble the hot card and change thermal paste and tighten it harder? I do not believe such difference is just silicon lottery.
Barely ran TimeSpy GT1 (1000W platinum PSU is def. not enough for these guys, upgrading to 1500 tomorrow) and power draw and frequencies are kinda same, but 12-13 difference is bugging me a lot

Edit: actually it is even 15C difference

Spoiler: IMGs

View attachment 234556

View attachment 234558

Most likely its mounting pressure or bad paste spread, you would get by far the best results with Liquid Metal on the die instead of paste, but that must be done with much care and needs some knowledge.
I would not feel too bad about 50-55c in a demanding game like RDR2, but of course, less is better. If you disassemble it, would be a good idea to have spare thermal pads of the correct thickness, they can get damaged during disassembly.

Btw, nice looking build

 

[Fatal Fighter]

Most likely its mounting pressure or bad paste spread, you would get by far the best results with Liquid Metal on the die instead of paste, but that must be done with much care and needs some knowledge.
I would not feel too bad about 50-55c in a demanding game like RDR2, but of course, less is better. If you disassemble it, would be a good idea to have spare thermal pads of the correct thickness, they can get damaged during disassembly.

Btw, nice looking build

I was totally thinking about changing thermal pads and even using LM, but idk what thickness pads needed, so thought I might reuse old ones plus kinda lazy to do it or think wont have much effect. I have seen great results with LM and know how careful you need to be, for obvious reasons coming from its name I think I will use it sooner or later, just hesitating for now.

Thanks for the reply and liking my build!

 

[nolive721]

thanks for the heads up as you are right, stable version dont capture RX6600 or 6600XT. I tried Beta version on both and you can override things like Voltage and Power in MPT but then the RADEON drivers would not allow you to go beyond the 20% power increase.

I can see the Voltage slider being updated (I had set move from 1150mV to 1175mV) but it doesn't do anything for power headroom to the GPUs unfortunately, again unless I am not using it properly (I played with my 6700XT last year and it was working well)

But anyway, for the sake of science and people who are considering a 6600 vs 6600XT, I did quite few back to back comparison as shown below in details.
My conclusion is the 6600XT is the better card at so much more efficient to achieve same FPS in benchmark or Games tested (almost 50W!!!!) and it will have the extra performance I will need to drive my 2 different monitor set-up with future AAA titles

Heaven is 1080p and all Graphics are Maxed out in the 2 Games tested, including heavy modding in AC

Detailed results here

RX6600 powercolor hellhound

Undervolt/OC 2555Mhz CORE 1.097V Memory 1750Mhz(fast) 101.5FPS 110W
DEFAUT all stock 98FPS
OVERCLOCK 2730Mhz Core 1.15V Memory 1862Mhz 103.9FPS 120W

BENCHMARKS

ASSETTO Triple 1080p
UV 73fps CPU use 70% 108W
DEFAULT 71fps CPU use 68% 105W
OC 75fps CPU 72% 129W


RX6600XT SAPHIRRE NITRO+

Undervolt 2188Mhz CORE 1.062V 103FPS Memory 200Mhz 75W
DEFAULt all stock 116FPS
OVERCLOCK 2965Mhz Core 1.15V Memory 2150Mhz 126FPS 148W

BENCHMARKS

ASSETTO Triple 1080p
UV 75fps CPU use 63% 75W
DEFAULT 84fps CPU use 70%
OC 90fps CPU 74% 144W

SHADOW TOMB Triple 1080p
UV 43fps Frame 6730
DEFAUT 48fps Frame 7516
OC 49fps Frame 7628

ASSETTO UW 1440P
UV 68fps CPU use 56% 71W
DEFAULT 75fps CPU use 61%
OC 81fps CPU 67% 146W

SHADOW TOMB UW 1440P
UV 58fps Frame 9000
DEFAUT 62fps Frame 9650
OC 65fps Frame 10250

the RX6600 is going back and I will be keeping the 6600XT until new and 2nd hand market prices come back to at least pre-COVID.

I am in the RED camp owning both CPU^GPU but I am not sure how they can convince people with current pricing if the Power efficiency vs Performance ratio is so far away from the XT variant?

maybe they bank on the fact that VEGA and RDNA1 are worse but that's not very customer base friendly.

anyway End of rant, I keep my 6600XT Nitro+ working in UV mode for some time and enjoy before the next upgrade

PS Last night I was playing RF2 one of my Simracing titles in UW1440p mode, no FSR, all Graphics maxed out and it was the 1st time I could see on a track the VRAM getting at 8Gb.I will need to keep an eye on this

 

[Fatal Fighter]

I am confused af. Is 1500W Titanium PSU not enough for two OC’d 6900XTs?? OC settings are 2600/2700 +15% power limit. No issues on stock. The PC shuts down on GT2 in Time Spy all the time. I can only some weird power spikes maybe, but integrated monitoring widget never shows power usage higher than 400w per each card.

 

[GamerGuy]

I am confused af. Is 1500W Titanium PSU not enough for two OC’d 6900XTs?? OC settings are 2600/2700 +15% power limit. No issues on stock. The PC shuts down on GT2 in Time Spy all the time. I can only some weird power spikes maybe, but integrated monitoring widget never shows power usage higher than 400w per each card.

Why are you on a dual RX 6900 XT CF setup when CF (like SLi) is basically dead in the water? I used to be a CF/SLi man myself, having owned dual GPU setups from time to time, last AMD CF cards were a pair of GB RX Vega64 Gaming OC, and a pair of GTX Titan. These were powered by either my Seasonic X-1250 or my Enermax MAX REVO 1500W PSU.

With regard to your present conundrum, it may be so. Reason I said this is because even with a single mildly OC'ed Nitro+ RX 6900 XT, my system would occasionally restart (very seldom, which makes it hard to troubleshoot as it would not be repeated when go into desktop again). The funny thing is, I can game all day, or at least 2-3 hours, and have absolutely no issue. But it'd be entirely possible that my rig would restart simply while I'm on desktop the very next time around. Never happened when I had a single PC Vega64 Red Devil in it (before upgrading to my present card) but occasionally do so now. It's so frustrating, but it happens so randomly, and so very seldom, that I'd given up trying to troubleshoot it.

BTW, I have a Corsair HX1000 Plat, which by right, should be more than sufficient for any single flagship GPU now. Oh yeah, are you running both cards OC'ed? If so, why not try running them at default setting first to see if they're stable to begin with?

 

[Fatal Fighter]

Why are you on a dual RX 6900 XT CF setup when CF (like SLi) is basically dead in the water? I used to be a CF/SLi man myself, having owned dual GPU setups from time to time, last AMD CF cards were a pair of GB RX Vega64 Gaming OC, and a pair of GTX Titan. These were powered by either my Seasonic X-1250 or my Enermax MAX REVO 1500W PSU.

With regard to your present conundrum, it may be so. Reason I said this is because even with a single mildly OC'ed Nitro+ RX 6900 XT, my system would occasionally restart (very seldom, which makes it hard to troubleshoot as it would not be repeated when go into desktop again). The funny thing is, I can game all day, or at least 2-3 hours, and have absolutely no issue. But it'd be entirely possible that my rig would restart simply while I'm on desktop the very next time around. Never happened when I had a single PC Vega64 Red Devil in it (before upgrading to my present card) but occasionally do so now. It's so frustrating, but it happens so randomly, and so very seldom, that I'd given up trying to troubleshoot it.

BTW, I have a Corsair HX1000 Plat, which by right, should be more than sufficient for any single flagship GPU now. Oh yeah, are you running both cards OC'ed? If so, why not try running them at default setting first to see if they're stable to begin with?

I know mGPU is not the thing anymore unfortunately ( never had been “a big deal” in fact) I just could not resist myself from buying second one as it was for $1550 and I am kinda a pc/upgrade addicted There is no issue on stock whatsoever, but was with 1000w, which was not enough for these hungry boys.
I am OC enthusiast and wanted to play around with these cards in some benchmarks, but havent tried yet other than Time Spy, which just shuts my PC down at 2600/2700. One card is 15C warmwer than the other, I really dont think this could somehow be connected with my issue, but I am going to reapply thermal paste anyways when adjustable fitting comes and see. If hwinfo or any other monitoring softs logs the data and saves, I would look it up and see if there is indeed power spikes, which is a thing for a reference 6900XT. Thanks for the reply! Will post one more time this regard as my vacation starts tomorrow and I will have more time to investigate.

 

[GamerGuy]

Holy crap, a pair of GB RX 6900 XT Xtreme WaterForce WB's!!! So jelly!!!

 

[Fatal Fighter]

looks good but not that practical

 

[Felix123BU]

I am confused af. Is 1500W Titanium PSU not enough for two OC’d 6900XTs?? OC settings are 2600/2700 +15% power limit. No issues on stock. The PC shuts down on GT2 in Time Spy all the time. I can only some weird power spikes maybe, but integrated monitoring widget never shows power usage higher than 400w per each card.

It should be, theoretically, that's 750w max per card, and even less if you subtract the rest of the system and the way the power rails are split. The recommended minimum Psu for a 6900xt is 850w, so not sure if a 1500w is enough for 2 water cooled and OC-ed 6900xt's.

I would try running time spy with only one Gpu, full power possible, disable the other one while testing. Gt2 can suck up to 380w constant on my 6800xt, for a 6900xt that should be even more without spikes. Just to make sure a) psu can at least handle one and b) if at least one runs without issues, to check if both Gpu's can run at the same settings stable.

Too high frequency settings can also cause crashed in Timespy, and generally any unstable OC can also cause crashes in Gt2 rather easy.

Not all 6900xt's can run 2600-2700mhz stable.

 

[Fatal Fighter]

It should be, theoretically, that's 750w max per card, and even less if you subtract the rest of the system and the way the power rails are split. The recommended minimum Psu for a 6900xt is 850w, so not sure if a 1500w is enough for 2 water cooled and OC-ed 6900xt's.

I would try running time spy with only one Gpu, full power possible, disable the other one while testing. Gt2 can suck up to 380w constant on my 6800xt, for a 6900xt that should be even more without spikes. Just to make sure a) psu can at least handle one and b) if at least one runs without issues, to check if both Gpu's can run at the same settings stable.

Too high frequency settings can also cause crashed in Timespy, and generally any unstable OC can also cause crashes in Gt2 rather easy.

Not all 6900xt's can run 2600-2700mhz stable.

Minimum requiremet for this particular version is 900watt psu even, but thats for the whole system and that’s why I think it kinda should be enough (for 2700freq. at least), but not 100% sure. I think I need to see logs of power usage of cards before shut down I guess.
Each card runs 2750mhz without issues, even though one card is way hotter than the other.
Actually I have two PSUs at home damn I totally forgot about that I didnt sell my 1000w psu yet. Tomorrow starts my vacation, disassambeling my cards and testing with two PSUs as well
Will post here later

 

[Fatal Fighter]

Looks like it is silicon lottery after all :|
I disassembled the card, re-applied thermal paste and made sure mounting issue is good, but no joy.
One thing that also came to my mind is maybe it is factory defected base plate? Like it is not touching die as it should. I made some photos, maybe someone will notice anything here.

But 90% it is just bad luck with silicon lottery.

As I mentioned in earlier post, I have two of these cards - Gigabyte 6900XT Xtreme Waterforce


Thermals after running Time Spy GT2

"Bad card"

"Good card"

 

[chris189]

Anyone know how to BIOS mod the 6600 XT? I'm sure it's not possible yet. Otherwise anyone know about a custom copper backplate for the Gigabyte Eagle AMD Radeon RX 6600 XT?

 

[CMP01]

After years of being shoehorned, one way or another, into Intel/Nvidia dominance (re gaming laptops and higher end desktop) I was amped at AMD's slow but steady come back rise from the ruins.
And haven't they done well too? First giving Intel a much needed boot in the nethers, then for the first time in a long time matching blow for blow to the top with Nvidia this gen.
So here I am now, my first all AMD system ever, first AMD CPU or GPU since the noughties... and it rocks. Just my opinion (and one that's seen me come off the worst in a few forums) The RDNA2 lineup, especially the top half, is easily as worthy as the Nvidia one. Too many ppl took the overhype pill and run on old AMD are hot, hungry, have poor drivers myths and RT and proprietary DLSS as proof of success alone but I say screw 'em. A handful of games supported does not a future standard yet make (though it will be the future... in the future) nm that only a year after launch games are already making RT and DLSS an either/or option for Ampere. Then there's the price probs stemming from all this, my 6800XT was half the price of (and way more available by two months or more) a 3080 that trades blows outside of RT perf that might be noticeable. I had the choice of a system with the former and other great parts or a 3080 with... not much else, 'nuff said.

Roll on RDNA3 and Zen 4.

 

[turbogear]

Anyone know how to BIOS mod the 6600 XT? I'm sure it's not possible yet. Otherwise anyone know about a custom copper backplate for the Gigabyte Eagle AMD Radeon RX 6600 XT?

Moding the bios of RDNA2 cards is not possible.
The good community at Igor‘s Lab tried it but I think gave up as it does not work.

 

[chris189]

Here's my results from my failed attempt at thermal modding the Gigabyte Eagle AMD Radeon RX 6600 XT. Then after proper results.

This card I got from a miner on eBay for $575 & I get continuous glitching on the HDMI or display corruption sometimes.

Now the hotspot went from 100°C to 79°C from 1.150v to 1.025v using MPT MorePowerTool.

 

[turbogear]

Here's my results from my failed attempt at thermal modding the Gigabyte Eagle AMD Radeon RX 6600 XT. Then after proper results.

This card I got from a miner on eBay for $575 & I get continuous glitching on the HDMI or display corruption sometimes.

Now the hotspot went from 100°C to 79°C from 1.150v to 1.025v using MPT MorePowerTool.

View attachment 236802

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To be honest, I am not too sure if the glitches that you see are due to thermal issue or something different wrong with the card.
Make sure that the VRAM have proper contact with the heatsink.
VRAM data corruptions can cause an image issue like you show in the photos.

I have something like that sometimes when I am too aggressive with OCing the VRAM.
I have 6900XT OC Formula which is flashed with the bios from AMD 6900XT reference LC card that offers 18Gbps memory on it.
With that bios I unlock higher VRAM speed.
This bios can‘t be flashed without a special programmer and is only compatible with 6900 XTXH cards.

 

[chris189]

@turbogear Thanks. I wish the guy before me didn't overclock the VRAM so much when mining then. I should RMA the card huh?