Hi, I have followed NickN's overclocking advice for o/c'ing my i7 930 to 4.2 ghz. I referenced his info listed in the following thread at simvation.com:http://205.252.250.26/cgi-bin/yabb2/YaBB.pl?num=1263037900/0For a 4 ghz o/c, he suggests the following for cpu voltage and qpi/dram voltage respectively:Cpu Voltage: 1.30-1.35vqpi/dram voltage: 1.35-1.40vI wanted to know if those two settings should be the same? I have seen some use a matched setting (i.e. 1.35 for both settings). If I was to increase cpu voltage to 1.36, should qpi/dram also be 1.36, or could that stay at 1.35?At the moment I am testing to see the lowest cpu voltage possible for stable operation at 4.2ghz and just needed to know how I should adjust the qpi/dram setting in relation to the cpu voltage.

On most i7 overclocks the qpi/dram is set higher than the cpu voltage and they do not have to be the same. I do not recall seeing any OC's that had the qpi/dram lower than the cpu voltage, but that does not mean that it does not happen. The only voltage rule of thumb that I recall is that the qpi/dram voltage and the dram bus voltage should be within 0.5V of each other.A great overclock site is overclock.net and in the Intel CPU forum there is a thread for the P6X58D, you might want to post your question over there.Rod

Hello A.J.First, all components are different to overclock. Even if you have exactly the same model (i7930, Asus P6X58D-E, ...)QPI/VTT and DRAM Voltages depends on two main factors. This are uncore and DRAM frequency. Higher DRAM freq. = higher uncore frq. Higher uncore freq needs more QPI/VTT voltage.Formula: uncore = at least 2 times DRAM frequency (exceptions are the gulftowns 1.5 times)Lets say your memories are rated with 2.0GHzExample 1: If your CPU is at 4.0GHz and your Memory is at 2.0GHz, than the Uncore hase at least 4.0GHz (can be higher depends on the multipler). Now the CPU needs (only an example) 1.35V, DRAM needs 1.65V and QPI/VTT needs 1.55V.Example 2: If your CPU is at 4.0GHz and your Memory is at 1.6GHz, than the Uncore hase at least 3.2GHz. Now the CPU needs (only an example) 1.35V, DRAM needs 1.58V and QPI/VTT needs 1.30V.Moste components can not go over 3.8GHz uncore unless you use a high and dangerous (more than 1.45V) QPI/VTT voltage.You have to find out which are the best values for your components.Good luck and much fun!Cheers

Hello A.J.First, all components are different to overclock. Even if you have exactly the same model (i7930, Asus P6X58D-E, ...)QPI/VTT and DRAM Voltages depends on two main factors. This are uncore and DRAM frequency. Higher DRAM freq. = higher uncore frq. Higher uncore freq needs more QPI/VTT voltage.Formula: uncore = at least 2 times DRAM frequency (exceptions are the gulftowns 1.5 times)Lets say your memories are rated with 2.0GHzExample 1: If your CPU is at 4.0GHz and your Memory is at 2.0GHz, than the Uncore hase at least 4.0GHz (can be higher depends on the multipler). Now the CPU needs (only an example) 1.35V, DRAM needs 1.65V and QPI/VTT needs 1.55V.Example 2: If your CPU is at 4.0GHz and your Memory is at 1.6GHz, than the Uncore hase at least 3.2GHz. Now the CPU needs (only an example) 1.35V, DRAM needs 1.58V and QPI/VTT needs 1.30V.Moste components can not go over 3.8GHz uncore unless you use a high and dangerous (more than 1.45V) QPI/VTT voltage.You have to find out which are the best values for your components.Good luck and much fun!Cheers

What would be the suggested QPI/VTT for the following: i7920 @ 4.2Ghz1.43750 core voltage21 CPU multiplier x 200 FSBOCZ Gold DDR3 1600Mhz 8-8-8-24 (3x2GB)1.66V DRAM (This is the closest to 1.65V I could get)I currently have the QPI/VTT at one click above 1.4V (I can't remember the exact number)Thanks.

Hi Shane,as i wrote already, every System is different.I can only suggest that you test the lowest QPI/VTT which is stable for your System.The numbers you wrote here sounds ok as long as the temps are ok, but perhaps you can lower Vcore and QPI/VTT.You can test stability with Linx or Prime95.Cheers

Hi Shane,as i wrote already, every System is different.I can only suggest that you test the lowest QPI/VTT which is stable for your System.The numbers you wrote here sounds ok as long as the temps are ok, but perhaps you can lower Vcore and QPI/VTT.You can test stability with Linx or Prime95.Cheers

My temps are fine, they never pass 70c even during OCCT Linpack testing, which my system passes 2 hours just fine.The odd thing about my system is occasionally, especially after sitting off for 8+ hours, it won't post the first time, but will after that just fine. It almost seems like it needs to "warm up" first, then it runs fine from then on. It still passes OCCT Linpack.

Shane,I know what you mean. Had this with different Motherboards, no matter which vendor. It was always the bios version. So, perhaps a newer bios version will get you out of this issue.cheers