Xeon Owners Club

[FilipM]

On the topic of QPI (VTT) Voltage, I run 1.3625 daily for nearly a year now, no issues yet.

 

[The Silviu]

This are my results on Firestrike. It seems that i'm the fastest with a single card rx480 and a Xeon x56xx series.View attachment 93599 View attachment 93599

I'm seeing everywhere that qpi/vtt overvoltage is the killer of this platform.

 

[FireFox]

I'm seeing everywhere that qpi/vtt overvoltage is the killer of this platform.

Exactly.

I have used it at 1.40V for bench, max 8/10 minutes.

 

[lyra]

well even with the extra ram speed its not good. i cant beat my old cinebench score or get a new max overclocked frequency, not cause of too high bclk causing memory instability but cause the uncore on my board seems to be a damp squib. wont go more than 3200 before giving up the ghost. ill tighten down the timings on my 2000mhz dims and run them at 1600 and see if i can get by with 6gb of ram if not ill just go back to my old 12gb of 1600mhz sticks

 

[FilipM]

Uncore frequency has nothing (very little) to do with the board I'm afraid.

 

[Regeneration]

On the topic of QPI (VTT) Voltage, I run 1.3625 daily for nearly a year now, no issues yet.

Yet is a big word. VTT is the killer of this platform. IMC/L3 degradation and instabilities are hard to detect. Causes silent data corruption over time.

Best way to detect it is to run Prime95 with custom FFT from 512K to 1024K, 90 percent of RAM, and to run some GPU stress test like Luxmark in the background.

 

[lyra]

Oh my understanding of it isnt very good then. Ill aim to learn about it more but not today. Im all tired now lol. I had some wierd things going on today like cpu ratio getting stuck on 20 when it was set to 26

 

[Zyll Goliat]

They claim that but it wouldn't makes sense because if i need Vcore 1.48V for 4.7GHz and VTT for daily max is 1.35V what do you think it would happen if i increase VTT to 1.45V/1.48V?

Well.....You are EXTREME case @Knoxx29 .......anyway I agree with you I just said what some other ppl. claimed and its kind of logical if your OC stays below Crazy Speeds&Voltages

 

[FireFox]

its kind of logical if your OC stays below Crazy Speeds&Voltages

That just if you overclock for 24/7 but if you do like me that turn on the Machine just for a few hours to do the overclock then let's use crazy Speeds and voltages it's kinda funny

 

[lexluthermiester]

And that's what i was talking about but you didn't get it

Guess so. My bad. Thought we were just talking about the ram voltage.

Oh shit okay. That was just the number it automatically did on the xmp. Good job i have only booted with my i7 920 so far then. Ill get that sorted out. What would be the max for that setting and how much should i tweak it in terms of getting stability?

On the setting "QPI/DRAM Core voltage", I've seen people go as high as 1.55v, but the Intel spec max is 1.3v. I'd stay close to that as a max if you're going to push your BCLK(base clock) beyond 133. If you're not going to OC the BCLK than leave it at the default as that setting will not affect the RAM, even though it states DRAM. What that setting actually does it set the voltage for the QPI link and the CPU's onboard cache, which is also considered a form of DRAM.

 

[Regeneration]

That just if you overclock for 24/7 but if you do like me that turn on the Machine just for a few hours to do the overclock then let's use crazy Speeds and voltages it's kinda funny

With your high-end cooling... you should be able to push the system to world record levels.

If you disable hyperthreading, you'll be able to push the CPU clock even higher but sacrificing some performance.

If you want to maximize BCLK to the 220-230 area, boost PCIE to 103 MHz, and increase the IOH/ICH core voltage from 1.1v to 1.25v.

 

[FireFox]

I missed to post Ram and Motherboard

 

[Regeneration]

Nice. If you want to get the highest possible score in benchmarks, you'll have to bump all clocks (Core, QPI+BCLK, Uncore, DDR) and to keep HT on.

The maximum BCLK in X58 is at the 230 range (QPI 4GT/s) after PCIE, IOH/ICH tweaks.

 

[FireFox]

Nice. If you want to get the highest possible score in benchmarks, you'll have to bump all clocks (Core, QPI+BCLK, Uncore, DDR) and to keep HT on.

The maximum BCLK in X58 is at the 230 range (QPI 4GT/s) after PCIE, IOH/ICH tweaks.

I will try it when i have time, right now it is 03:37am

 

[agent_x007]

Rising QPI/VTT Voltage is required for high NB Frequency (UnCore), but I always look at "UnCore" as L3 with IMC (not just IMC).

1,65V limit on RAM for Nehalem is result of default QPI/IMC voltage.
It's the difference between IMC and RAM power planes that is deadly (max. is 0,5V), not voltages themselves (up to a point). Source : LINK.

Also, a bit higher Vcore may be needed when bumping NB Frequency (since L3 cache is faster, it puts more stress on cores).

I don't use XMP profiles on first gen i7's (because they also need a QPI/VTT setting to be stable).
Newer RAM sticks don't have specific values for QPI/VTT.
Result is 1,7V QPI/VTT afetr loading XMP profile (which probably will damage a not LN cooled IMC).

 

[phill]

Loving the overclocking on these pages guys Reminds me of chasing number for my 920 D0 for Hwbot Shame I only had water cooling at the time so...

 

[FireFox]

Reminds me of chasing number for my 920 D0 for Hwbot

I have one 920 D0, tomorrow i will do some overclock with it i hope i still have some thermal paste left

 

[phill]

I think I have been pretty lucky with both of mine, 4.5Ghz+ LinX stable I thought was pretty impressive Still have them to this day.. I do have a Gigabyte X58 SOC sitting pretty at the moment, maybe I should tempt myself into buy a Xeon for it and seeing what it can do.....

 

[CAPSLOCKSTUCK]

I think I have been pretty lucky with both of mine, 4.5Ghz+ LinX stable I thought was pretty impressive Still have them to this day.. I do have a Gigabyte X58 SOC sitting pretty at the moment, maybe I should tempt myself into buy a Xeon for it and seeing what it can do.....

Im still first in UK at R 15 with

E 5620
E5640
X 5670

and third with X 5650


Please beat me......

 

[FireFox]

I am still looking for a X5698 and i hope to find a good deal on an i7 980X or i7 990X, i need some CPUs to kill

 

[phill]

If you'd like to take a look at my HWbot profile, it's phill It'll have a picture of me and my daughter who I was benching before I got into the top 5 in the UK before I gave up about 2 years ago now

https://hwbot.org/submission/2817412_phill_2_cinebench___r15_2x_xeon_x5650_1915_cb

That was my best with my 2 X5650's.. They weren't the best overclocking CPUs I found, but then also with so much ram, I think I was struggling with that too

 

[FireFox]

If you'd like to take a look at my HWbot profile, it's phill It'll have a picture of me and my daughter who I was benching before I got into the top 5 in the UK before I gave up about 2 years ago now

https://hwbot.org/submission/2817412_phill_2_cinebench___r15_2x_xeon_x5650_1915_cb

That was my best with my 2 X5650's.. They weren't the best overclocking CPUs I found, but then also with so much ram, I think I was struggling with that too

Nice score, of course 2 x Chips it makes a big difference when running CineBench.

Wait did you gave up because @CAPSLOCKSTUCK

Joke.

Where is the SR-2?

Note: when i run any Bench max memory i use is 8GB.

 

[phill]

It kinda does, but when the CPU's sucked overclocking, I wasn't getting too far and with running 24Gb or 48Gb of ram (at the time that's all I had!!) I think it was limiting the overclock, no amount of volts seemed to help which was a pain lol I was chasing for some high points which I did manage with a 3rd place in the world for the GPUPI test, was very happy with that

Sadly no, I was going through a rough time having had problems with ex and daughter (she was 2.5 years old at the time) and benching was a way of ignoring but I just ended up spending so much cash, when I spent £1000 on a 5960X I decided, whoa... Hang on, not benching that!! Needless to say, 2.5 years on, still issues with the ex and such but it's a little easier... But not brilliant as I've switched jobs and I've lost a load of pay to go with it!! But starting at the bottom in IT is a good place to be should I get a pay rise

My SR-2 is still with me, same as my other EVGA Classified boards Won't be selling those......

Do you have special sticks of ram to use for benching with the CPU's?

 

[Zyll Goliat]

It kinda does, but when the CPU's sucked overclocking, I wasn't getting too far and with running 24Gb or 48Gb of ram (at the time that's all I had!!) I think it was limiting the overclock, no amount of volts seemed to help which was a pain lol I was chasing for some high points which I did manage with a 3rd place in the world for the GPUPI test, was very happy with that

Sadly no, I was going through a rough time having had problems with ex and daughter (she was 2.5 years old at the time) and benching was a way of ignoring but I just ended up spending so much cash, when I spent £1000 on a 5960X I decided, whoa... Hang on, not benching that!! Needless to say, 2.5 years on, still issues with the ex and such but it's a little easier... But not brilliant as I've switched jobs and I've lost a load of pay to go with it!! But starting at the bottom in IT is a good place to be should I get a pay rise

My SR-2 is still with me, same as my other EVGA Classified boards Won't be selling those......

Do you have special sticks of ram to use for benching with the CPU's?

Dude 2xXeons OC at 4ghz with that ammount of ram are GREAT result especially if that works as yours 24h PC and it´s not just for benchmarks&showing....

 

[phill]

I was hoping to use it a little more but the power usage and my 5960X is slightly bit faster! lol But, when I have some cash together, I think I'll try and get that system up and running, just needs a PSU and some water for the cooling It was a beast and so nice seeing 24 threads in CPU History

What do you guys run for your 24/7 rigs??