P6X58D & i7-980x @ 4.3 GHz - Need help pushing further

[00011011]

4.3GHz Prime95's running fine with 143x30 and 1.336 Vcore, 1.6 QPI/dram (cpu vtt). Trying to push further; I've read that I have a chip from a good batch.

In my BIOS, it doesn't say Vcore anywhere, I've been assuming that is what "CPU Voltage" is. But what's weird, is that even though I've been increasing the CPU Voltage, when I get into Windows, CPU-Z still stays Core Voltage is still the same (1.344).

I increased to 143x31 (4.43 Ghz) and
increased CPU Voltage to 1.34. boots fine, freezes immediately on P95...
increased CPU Voltage to 1.350, boots fine, freezes immediately on P95...
increased CPU Voltage to 1.356, boots fine, I got about 10 seconds out of P95 before freezing this time tho...

I'm not sure what the max Vcore is for this chip (Intel website states VID is 1.375; not sure what this is exactly)? I've seen another person state they're running with 1.4 Vcore though...

Thoughts? Should I keep increasing voltage a bit more? Is there something else I'm possibly overlooking?

[Blauhung]

my 980x hit a wall around 4.3 as well. I had to bump Vcpu up above 1.4V before i could start working my way up. 4.5GHz took 1.425V in BIOS to be stable.

[Sam_oslo]

Intel recommends absolute max vCore=1.4v for 32nm, but it is a good idea to keep it under 1.375v for 24/7.

Those early BSOD in prime, that vCore increase doesn't help them, are usually related to IMC/Uncore. Usually it needs more VVT for that specific Uncore multi/frequency.

Whatever you do, don't run with VVT=1.6v for 24/7. VVT is a bigger killer/degrader than vCore, and nobody knows the long term effect of high VVT on 32nm yet. Besides, even if it doesn't kill/degrade your chip, it will add a lot of heat to your CPU and VRM. Save those heat for higher OC by reducing the VVT. Try to reduce the Uncore multi/frequency, then you would need less VVT.
Intel recommends max-VVT=1.4v, but try to keep it under 1.34v to secure a long life, and less torture and heat, for your CPU.
What kind of Uncore multi are you using?

[Peen]

Voltage doesn't seem too bad. Just depends on what you're doing though, if your trying to find max 24/7 clocks wouldn't go much over 1.35v otherwise heat and power consumption goes up way too much. Your VTT voltage is way to high though, I would lower that close to 1.2v and work your way up

[00011011]

I had to bump Vcpu up above 1.4V before i could start working my way up. 4.5GHz took 1.425V in BIOS to be stable.

Thank you

Intel recommends absolute max vCore=1.4v for 32nm, but it is a good idea to keep it under 1.375v for 24/7.

Those early BSOD in prime, that vCore increase doesn't help them, are usually related to IMC/Uncore. Usually it needs more VVT for that specific Uncore multi/frequency.

Whatever you do, don't run with VVT=1.6v for 24/7. VVT is a bigger killer/degrader than vCore, and nobody knows the long term effect of high VVT on 32nm yet. Besides, even if it doesn't kill/degrade your chip, it will add a lot of heat to your CPU and VRM. Save those heat for higher OC by reducing the VVT. Try to reduce the Uncore multi/frequency, then you would need less VVT.
Intel recommends max-VVT=1.4v, but try to keep it under 1.34v to secure a long life, and less torture and heat, for your CPU.
Shortly, try to use x16 or x15 multi for Uncore. What kind of Uncore multi are you using?

My VVT of 1.6 was actually set automatically by the X.M.P. profile in BIOS for my Corsiar 2000 MHz RAM. It also set my BCLK to 143, which I left alone and just started raising my CPU Ratio Setting (30 now). Should I start backing this VTT down incrementally until it loses stability that way before going any further?

The UCLK Freq I just had set to Auto and it doesn't look like BIOS is telling me what it will be. CPU-Z didn't mention UCLK either. Is there another way to determine what it is being set at? I know it's supposed to be at least double the DRAM Freq (which is 2006 MHz). Should I just manually set the UCLK to 4014 MHz or something (that is the lowest that is 2x the DRAM) instead?

[acebmxer]

Thank you



My VVT of 1.6 was actually set automatically by the X.M.P. profile in BIOS for my Corsiar 2000 MHz RAM. It also set my BCLK to 143, which I left alone and just started raising my CPU Ratio Setting (30 now). Should I start backing this VTT down incrementally until it loses stability that way before going any further?

The UCLK Freq I just had set to Auto and it doesn't look like BIOS is telling me what it will be. CPU-Z didn't mention UCLK either. Is there another way to determine what it is being set at? I know it's supposed to be at least double the DRAM Freq (which is 2006 MHz). Should I just manually set the UCLK to 4014 MHz or something (that is the lowest that is 2x the DRAM) instead?

Dont use X.M.P profile. Set memory speed and voltages manually...

Uclk freq for i7-980x has a new rule compaired other I-7's... Its now 1.5 times memory multi. So if your using a 14x memory multi you want to use a 21 uncore multi.

[Peen]

Uncore is in the Memory tab, and Northbridge frequency on cpu-z.

[00011011]

Uncore is in the Memory tab, and Northbridge frequency on cpu-z.

on the Memory tab, I see NB Frequency and DRAM Frequency, but nothing about Uncore

[acebmxer]

nb frequency is the uncore

[00011011]

Thanks everybody for the info so far

nb frequency is the uncore

Sorry, this is my first LCS

Dont use X.M.P profile. Set memory speed and voltages manually...

Uclk freq for i7-980x has a new rule compaired other I-7's... Its now 1.5 times memory multi. So if your using a 14x memory multi you want to use a 21 uncore multi.

OKAY! Breaking out of the template, here goes! I changed the AI Overclock Tuner from the X.M.P. Profile --> Manual and then set:

BCLK: 144
CPU Ratio: 31 (4462 MHz) I think I wanna shoot for the *Intel 4.5GHz LinX Stable Club*
DRAM Freq: 2020 MHz
UCLK Freq: 3032 MHz
CPU Volt: 1.375
QPI/DRAM Volt: 1.40

From what I've learned here, I also have (and had previously):

Load-Line Calibration: Enabled
C1E Support: Disabled
Intel C-State: Disabled
Virtualization: Disabled
Intel HT Tech: Disabled (for now)
SpeedStep: Disabled (for now)

So with this, I ran the P95 "Small FFT (ram not tested much)" for 10 minutes stable with a single core only maxing out at 56C (Ambient=27C). Gonna continue trying to increase the CPU Ratio more from here....

** is this best P95 Torture Test to use or is it better to use the "In Place FFT (some RAM tested)" or "Blend (lots of RAM tested)"? I was thinking if I'm just trying to achive the highest possible OC, what would be the point of testing the RAM so much....

======> The next thing I tried was increasing the CPU Ratio to 32 (4608 MHz) and it froze and gave me the vertical bars on the screen before Windows loads. Any thoughts on what to try next based on my above manual settings... Raising the QPI/DRAM Voltage a little perhaps?

Thanks guys!

[acebmxer]

So with this, I ran the P95 "Small FFT (ram not tested much)" for 10 minutes stable with a single core only maxing out at 56C (Ambient=27C). Gonna continue trying to increase the CPU Ratio more from here....

** is this best P95 Torture Test to use or is it better to use the "In Place FFT (some RAM tested)" or "Blend (lots of RAM tested)"? I was thinking if I'm just trying to achive the highest possible OC, what would be the point of testing the RAM so much....

============
The next thing I tried was increasing the CPU Ratio to 32 (4608 MHz) and it froze and gave me the vertical bars on the screen before Windows loads. Any thoughts on what to try next based on my above manual settings??

Thanks guys!

Small FFT stresses the CPU. In-place large FFT stress the cpu and a little ram. Blend stress everything and all your ram.... Its suggested to pass 6-12hrs small 6-12 hrs of in-place and 12-24 hrs of blend to say your stable.

[Sam_oslo]

Take 2 hours Prime smallFFT, + a memtest or a HyperPi32M-run, it should be stable enough for 24/7 use. But try it with your daily applications and see how stable it is for your needs.
It is not a good idea to torture it with long Prime runs in these high vCore/speeds.

You should also try yo get the VVT under 1.34v for 24/7 use.

[00011011]

Its not letting me break the 4.5GHz barrier....

========== THIS IS WORKING ==========
BCLK: 144
CPU Ratio: 31 (4462 MHz)
DRAM Freq: 2020 MHz
UCLK Freq: 3032 MHz
CPU Volt: 1.375
QPI/DRAM Volt: 1.40

========== THIS IS NOT ==========
CPU Ratio: 32 (4608 MHz)

I guess I'll fiddle with the settings (lower BCLK, raise CPU ratio, etc...) to try and come in closer to 4501 MHz...

[Sam_oslo]

You got a screen shot with Prime-load, temp, and CPUz-tabs? It would be much easier to see what's going on.

Something like this: http://www.xtremesystems.org/forums/...postcount=1493

[00011011]

You got a screen shot with Prime-load, temp, and CPUz-tabs? It would be much easier to see what's going on.

Something like this: http://www.xtremesystems.org/forums/...postcount=1493

It wasn't stable all of a sudden at above mentioned settings. Not sure why, so I had to take my original CPU Volt from 1.375 and:

increased --> 1.38125. Still BSD on me...
increased --> 1.38750. Still BSD on me...
increased --> 1.39375. Finally... stayed stable

not sure why it became so irritable all of a sudden. Temps are up a bit obviously because of the new voltage...

[Sam_oslo]

Well, that 1.384v is not too bad for 4.46HGz, and probably that's what your CPU/batch# can do.
The temp is OK, too. Just try to keep the VVT in check, otherwise if it can run a couple of hours Prime, + some memtest, then it looks good and you should be happy with that extra 1.6GHz you got.

[00011011]

Well, that 1.384v is not too bad for 4.46HGz, and probably that's what your CPU/batch# can do.
The temp is OK, too. Just try to keep the VVT in check, otherwise if it can run a couple of hours Prime, + some memtest, then it looks good and you should be happy with that extra 1.6GHz you got.

Would you quit with 38 MHz to go?

[PatRaceTin]

using BCLK will be more fun!!!

[acebmxer]

^ +1.... Drop multi down to like 19 or 21... then push bclk to 200 get that stable then start raising the multi back up

[00011011]

^ +1.... Drop multi down to like 19 or 21... then push bclk to 200 get that stable then start raising the multi back up

Well, with a BCLK of 200, I would be stuck at jumping from 4.4 to 4.6 GHz... right?

Also I thought that when you have an unlocked multiplier, that it is no longer needed to OC in that fashion... by maximizing the BCLK.

[acebmxer]

Yes having a unlocked muli is better... but you could be putting to much stress on the cpu... so you could try lowering the multi and and raising the bclk to even out the stress... Or you could just simply just need to push vcore up more.

[00011011]

... but you could be putting to much stress on the cpu...

Are you saying that if CPU Frequency stays constant at 4.5 GHz and CPU Voltage says constant at 1.425, that...

125x36 stressed the CPU out more than 180x25 ?

Another question: I have a top filling Res, and it seems that I have to add a couple ml of coolant every day so that it stays abolutely full and not become airated. Does coolant naturally burn off or evaporate or something in water cooled systems, or do i have a poor seal some where and it may be evaporating? I know there are no "leaks"...

(Also, today I just passed the LinX 20 Run Stable test @ 4.5 GHz. Will post to that thread in a bit)

[GreyStone]

Thank you



My VVT of 1.6 was actually set automatically by the X.M.P. profile in BIOS for my Corsiar 2000 MHz RAM. It also set my BCLK to 143, which I left alone and just started raising my CPU Ratio Setting (30 now). Should I start backing this VTT down incrementally until it loses stability that way before going any further?

The UCLK Freq I just had set to Auto and it doesn't look like BIOS is telling me what it will be. CPU-Z didn't mention UCLK either. Is there another way to determine what it is being set at? I know it's supposed to be at least double the DRAM Freq (which is 2006 MHz). Should I just manually set the UCLK to 4014 MHz or something (that is the lowest that is 2x the DRAM) instead?

Just Curious - I have the same board and DRAM kit. Manual says selecting XMP profile will present 2 additional options; 1. Performance 2. Frequency. Which option did you select?

[00011011]

I didn't use XMP in the end.

CPU BCLK: 125
CPU Multiplier: 36
DRAM: 2005
UCLK: 3008
CPU Voltage: 1.425
CUP VTT: 1.4