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CPU VTT, QPI and IOH voltage interactions with an i7 920 rig

post #1 of 26
Thread Starter 
How do these interact?

I wish to reach my 4.2ghz OC, but to do so, I'm needing to raise my CPU VTT to dangerously high levels. I understand that all chips are not created equal, and even with my D0 chip, I'm requiring quite high voltages.

Currently, my "stable" profile for in order to reach 4.2ghz is:
CPU VCore: 1.425V
CPU VTT Voltage: +225mV (which brings me to ~1.41V VTT)
CPU PLL VCore: 1.85V
DIMM Voltage: 1.65V
QPI PLL VCore: 1.35V
IOH: ~1.22V

I have tried lowering the VCore as well as the VTT. Anything less, and I will crash at some point. I use my system for 24/7 folding, and getting to 4.2ghz is quite an improvement on my PPD.

I have since lowered my clocks to 4.0 on much lower voltages, but I am still interested if there is anything I can tweak, that I may be missing, that will give me stability at lower voltages, specifically, my VCore and CPU VTT.
 
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post #2 of 26
What speed is your RAM at with the VTT?
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post #3 of 26
Thread Starter 
To be honest, I have it set at auto... which generates quite loose timings. 11-11-11-29, IIRC.

Any time I messed with my RAM and Uncore? timings in the BIOS, my computer refused to post. Even when using the proper ratios. Everything always worked fine on auto though...
 
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post #4 of 26
VTT/QPI is the voltage for the uncore, which, accurately named, is the voltage for pretty much everything other than the core. This includes the QPI link and more notably, the IMC (Internal Memory Controller).

QPI/VTT shouldn't effect your ability to get an OC at 4.2GHz too much. However, it's the reason I chose to run 176x24 (4.224) instead of 200x21 (4.200). With 176, I can use the 10x multi for 1760MHz on the memory whereas with 2000MHz (200x10) I have to use 1.515V QPI/VTT.


What are your BIOS settings? These are the important ones below:


CPU Freq:
BCLK:
CPU Multi:

QPI Link:

Uncore Freq:
Uncore Multi:

Memory Freq:
Memory Multi:
Memory Timings:

CPU Volts:
QPI/VTT Volts:
CPU PLL:
QPI PLL:
IOH Core:
DRAM Volts:
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post #5 of 26
Thread Starter 
I'm in the middle of finishing off a -bigadv unit, but I will post these ASAP tomorrow. I lost quite a bit of time on the unit due to instability issues when trying to lower random voltages on the 4.2ghz OC.

I'll get you those answers ASAP tomorrow morning though! Sorry for not responding with them tonight. :\

Also, thank you for the explanation above! I wish I could use a higher multiplier, but the highest I can get is 21x.
 
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post #6 of 26
No need to apologize. I'm subscribed so I'll reply pretty soon after.
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post #7 of 26
Thread Starter 
CPU Freq: 4228 Mhz according to BIOS
BCLK: 201
CPU Multi: 20x (21x after Turbo mode, highest I can go)

QPI Link: Explain, I'm sorry :\

Uncore Freq: Auto
Uncore Multi: Tied to Frequency

Memory Freq: Auto
Memory Multi: Tied to Frequency
Memory Timings: 11 -11 - 11 - 29 (auto)

CPU Volts: 1.425
QPI/VTT Volts: +225 mV (puts it up to about 1.42, I think)
CPU PLL: 1.875
QPI PLL: 1.35
IOH Core: 1.225
DRAM Volts: 1.65

I will add screens in a moment.
 
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post #8 of 26
Thread Starter 
Sorry for the massive screens... epic camera fail.

Main screen

Memory control

Memory frequency options

Voltage control

CPU VCore options

CPU VTT options

CPU PLL options

DIMM voltage

QPI PLL VCore

IOH VCore

CPU Features

CPU Uncore Frequency


EDIT: So, I think that's basically my entire BIOS. Hopefully, I can get some input! Thanks for everyone's time and patience as I learn more about overclocking!
Edited by stu. - 1/19/11 at 12:07pm
 
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post #9 of 26
Alrighty...

What speed is your memory on at default? Set it to that speed and timings and make sure your Uncore is double the speed of the memory. For instance, if your memory is 1600MHz, use the 8x multi (201x8) for memory and the 16x multi for uncore.

QPI Link is the speed that shows on CPU-Z as the "Rated FSB".

Would you mind posting a CPU-Z link?
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post #10 of 26
Thread Starter 
I will post all of that at 6pm when I get home, thanks for the help!
 
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