Ryzen Owners Zen Garden

[AusWolf]

7800X3D should be around 100-110W in Linpack. Make comparisons that are apples to apples.

I tested in Cinebench. Is Linpack that much different? I'll have a go, although, if it really gets to 110 W, I'll probably run into some throttling. It's already at 80-82 °C with 85 W.

 

[tabascosauz]

I tested in Cinebench. Is Linpack that much different? I'll have a go, although, if it really gets to 110 W, I'll probably run into some throttling. It's already at 80-82 °C with 85 W.

I was looking at Linpack runs on 7800X3D landing around 400GFLOPS (vs. 5800X3D around 320-330GFLOPS), which is a pretty accurate middle ground between 5800X(3D) and 5900X. But like P95 it might need PBO to take the conservative current limits off. Dunno how the stock 7800X3D will react

You also get up to -50 CO range on AM5, on top of already super easy stock V-F.

 

[AusWolf]

I was looking at Linpack runs on 7800X3D landing around 400GFLOPS (vs. 5800X3D around 320-330GFLOPS), which is a pretty accurate middle ground between 5800X(3D) and 5900X. But like P95 it might need PBO to take the conservative current limits off. Dunno how the stock 7800X3D will react

You also get up to -50 CO range on AM5, on top of already super easy stock V-F.

I just did a run, and... what kind of magic is this?

The CPU eats 96 W, but runs cooler than when it's eating 10 W less in Cinebench! Also, it only does 4.575 GHz despite not being near any kind of limit at all!

Does AMD use a W-GHz curve or something? This is some weird shit...

 

[tabascosauz]

I just did a run, and... what kind of magic is this?

The CPU eats 96 W, but runs cooler than when it's eating 10 W less in Cinebench! Also, it only does 4.575 GHz despite not being near any kind of limit at all!

Does AMD use a W-GHz curve or something? This is some weird shit...

View attachment 326867

That's probably the current limits that i was talking about. It's not new, it's been there since Zen 3, AMD throttles very hard by default in perceived "heavy" workloads like P95 Small FFT and Linpack, even if watts and temps are not an issue.

It's why P95 will borderline burn Zen 2 CPUs but Zen 3 CPUs don't even hit their stock PPT. That's not the limit they run into, it's something else AMD has imposed. PBO should usually lift it.

 

[AusWolf]

That's probably the current limits that i was talking about. It's not new, it's been there since Zen 3, AMD throttles very hard by default in perceived "heavy" workloads like P95 Small FFT and Linpack, even if watts and temps are not an issue.

It's why P95 will borderline burn Zen 2 CPUs but Zen 3 CPUs don't even hit their stock PPT. That's not the limit they run into, it's something else AMD has imposed. PBO should usually lift it.

But TDC and EDC limits show 57 and 41%. I'm confused. Are we constrained by some invisible wall that HWinfo doesn't show?

Edit: Also, a CPU running at 96 W should be hotter than the same one running at 85 W, right? Or did I skip too many physics classes?

 

[tabascosauz]

But TDC and EDC limits show 57 and 41%. I'm confused. Are we constrained by some invisible wall that HWinfo doesn't show?

Edit: Also, a CPU running at 96 W should be hotter than the same one running at 85 W, right? Or did I skip too many physics classes?

I'm pretty sure it has nothing to do with TDC and EDC so you won't get your answers from there. More wattage should be hotter, but unless you know Vcore as well it doesn't mean much.

 

[Count von Schwalbe]

But TDC and EDC limits show 57 and 41%. I'm confused. Are we constrained by some invisible wall that HWinfo doesn't show?

Edit: Also, a CPU running at 96 W should be hotter than the same one running at 85 W, right? Or did I skip too many physics classes?

Depends a bit on thermal density. If parts of the core are not being used it might run hotter as the wattage is more concentrated.

My guess anyways.

 

[freeagent]

With Linpack, everything gets used. I choose option number 5 for my runs, 10GB.

 

[AusWolf]

Depends a bit on thermal density. If parts of the core are not being used it might run hotter as the wattage is more concentrated.

My guess anyways.

That makes sense. Kind of why my GPU runs roughly 100 MHz slower when RT is used vs when it isn't. More parts consume more power -> lower clocks are needed to balance power consumption.

 

[freeagent]

That makes sense. Kind of why my GPU runs roughly 100 MHz slower when RT is used vs when it isn't. More parts consume more power -> lower clocks are needed to balance power consumption.

That is why when you said everything runs at 4800-5GHz I was like well.. let’s see when you run this.. Not going to lie I was expecting the socket to be feeding much more.

 

[AusWolf]

That is why when you said everything runs at 4800-5GHz I was like well.. let’s see when you run this.. Not going to lie I was expecting the socket to be feeding much more.

To be honest, I never used any program before that pushed it below 4800 MHz, so I didn't have a clue.

I think it could feed much more, as I'm not even near any kind of limit (thermal, power, current, etc.). I have no idea why it lowers boost like that for seemingly no reason.

 

[freeagent]

I have no idea why it lowers boost like that for seemingly no reason.

That is one of the heaviest loads that you can place on a CPU

think it could feed much more, as I'm not even near any kind of limit (thermal, power, current, etc.). I have no idea why it lowers boost like that for seemingly no reason.

Can you? On X3D for AM4 we can only reduce power limits, which in turn, reduces performance, especially with that program. My X3D runs at closer to 4300MHz with that program, and my 5900X runs at ~4550 with my current limits of 260/170/200.

 

[AusWolf]

That is one of the heaviest loads that you can place on a CPU


Can you? On X3D for AM4 we can only reduce power limits, which in turn, reduces performance, especially with that program. My X3D runs at closer to 4300MHz with that program, and my 5900X runs at ~4550 with my current limits of 260/170/200.

The 7800's power limit is 162 W by default, 90 W is nowhere near that. Even the current limits are at ~50% in Linpack, so there is definitely more headroom in every sense.

Unless it lowers boost only to remain stable, which might be a hidden mechanism of the CPU that we can't see in HWinfo.

 

[Deleted member 223428]

Hi All - Quick question for those on AM5 with a dual CCD chip. Is there no option to disable the second CCD within the BIOS? I've searched every page and I can't find anything. Also, I remember in the initial reviews of the X3D's that some had a BIOS option to prefer cache or prefer frequency. Was that specific to a certain OEM because I can't find that either.

Thanks.

<------- System specs

 

[Kapone33]

Hi All - Quick question for those on AM5 with a dual CCD chip. Is there no option to disable the second CCD within the BIOS? I've searched every page and I can't find anything. Also, I remember in the initial reviews of the X3D's that some had a BIOS option to prefer cache or prefer frequency. Was that specific to a certain OEM because I can't find that either.

Thanks.

<------- System specs

To do that you need Ryzen Master.

 

[Deleted member 223428]

To do that you need Ryzen Master.

The AM4 board I had previously had the option to disable cores/ccds within the bios. This sucks.

 

[Kapone33]

The AM4 board I had previously had the option to disable cores/ccds within the bios. This sucks.

Some boards do have that option.

 

[Deleted member 223428]

Thanks. Ryzen Master unfortunately isn't an option for Linux.

Found it. It's under the AMD Overclocking section.

Disabling the non-3D Cache CCD double the frame rate in the game I'm testing. Windows takes care of this on it's own, probably through the AMD chipset drivers, but under Linux is uses all 16 cores and tanks the FPS.

 

[Ruru]

Using a HD 7970 for a day and ran Fire Strike

I scored 2 601 in Time Spy

AMD Ryzen 7 5800X, AMD Radeon HD 7970 x 1, 32768 MB, 64-bit Windows 11}

www.3dmark.com

 

[TheGuruStud]

Well, it's been a while. But still running 5800x3d overclocked on x370 and it's been 100% stable. Yeehaw! Same performance as LOLtel 14900k.
Die, Intel, die

 

[Super XP]

Well, it's been a while. But still running 5800x3d overclocked on x370 and it's been 100% stable. Yeehaw! Same performance as LOLtel 14900k.
Die, Intel, die

You got a 5800 working on a X370?

 

[Ruru]

You got a 5800 working on a X370?

According to his specs, he seems to have a Crosshair VI Hero. And it's supported by Asus: https://rog.asus.com/motherboards/rog-crosshair/rog-crosshair-vi-hero-model/helpdesk_cpu/

 

[Deleted member 229121]

With Linpack, everything gets used. I choose option number 5 for my runs, 10GB.

I don't use Linpack anymore, it's borderline sadomasochism.

 

[TheGuruStud]

I don't use Linpack anymore, it's borderline sadomasochism.

I use it and still don't hit the thermal limit. Water coolers are for Intel clowns.

 

[Deleted member 229121]

I honestly can't remember when the last time I ran it was, but know it was with an i5-750 @ 4.2 GHz.
Had that under a Meghalems and an H60 w AP-15s, Linpack crushed them both.

Did not even bother with my 3770K, P95 was good enough lol.