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i7-950 Newbie Overclocking Assistance.

post #1 of 4
Thread Starter 
Hey all,

New member here. I've always bought components rated great for overclocking when I built PCs....and then never overclocked them. Today, I am finally putting a stop to that. I have a I7-950 paired with an Asus Sabertooth X58 that I assembed 4-5 years ago and I want to overclock it. My goal is a meager 4.0 Ghz. If it's relevant, the RAM I have in the system is 3x2 gb OCZ Gold 1600 Mhz.

So right now I'm running a 3.8 Ghz OC on 1.25 Vcore, 1.2 QPI/DRAM, and 1.64 DRAM voltages. I'm running at a CPU multiplier of x24. To be honest, the Vcore and DRAM voltages are the only two I fully understand. I've read numerous guides but I haven't quite picked up on what other voltages (QPI, IOH, etc.) I'm suppose to be using/staring with. I tried a 4.0 Ghz OC at 1.275, 1.2 QPI/DRAM voltages but it failed a few hours into a Prime95 test. The error it gave me was a NTFS file system error so I'm not entirely sure if it's related to voltages or not. I have the ram manually set for the timings they're rated for, but I've also read that the OCZ ram is troublesome. Before the 4.0 Ghz OC failed, I averaged 78-79 degrees at load, but did peak at 81 so I suppose I'd want to stay lower if possible.

Basically, I'm asking for guidance on the voltages that I'm unsure of. Also, should I be using the x24 CPU multiplier, or should I be using a lower multiplier? Different guides suggest different things and it's leaving me unsure.

Any guidance would be greatly appreciated!

Rick.
post #2 of 4
Yeah, you'd want to stay under 80°C for 24/7 use. You may need more CPU Vcore voltage for a 4.0 GHz overclock, all chips overclock differently, even the same. Some may require less voltage for the same clock, some may require more voltage for the same clock. You may even require 1.32 between 1.37v if you're unlucky.

It doesn't really matter which multiplier you use in my option (correct me if I'm wrong). I've never had issues with using certain CPU multipliers. Which CPU Cooler are you using by the way?

You may want to rise the QPI/VTT voltage ranging from around 1.2V to 1.35V, this may help with the stability of your overclock. Yes, QPI And VTT are the same thing.

The first thing you might want to do before overclocking your CPU is by getting the highest possible stable BLCK clock. Make sure readjust the CPU multiplier and the RAM clock as altering the BLCK clock will alter the frequencies of the CPU and RAM clock. So make sure you double check what it'll run when raising the BLCK Clock. A higher BLCK is better. If you're lucky you may be able to get a BLCK ranging around 190-210.

Also choose the lowest setting for QPI link (This also helps with stability), there may be usually 3 settings to choose from.

Set PCI-E frequency manually to 100 (If this is altered, it can cause instability and even damage to your graphics card).

You may also want to enable all C-States with EIST (Enhanced Intel Speedstep Technology)

Also manually set the ram timings to the rated timings on your RAM stick stickers, also manually set the rated clock (If can't, set the allowed memory clock that is closest to the ram clock)

Also, about QPI Voltage, having it over V1.45 may cause degradation on the IMC (Integrated Memory Controller)

This is useful because it explains what these confusing terms are:
An explanation to the confusing words such as QPI/VTT/DIMM/VDIMM and ETC.
Edited by benjamen50 - 3/13/14 at 12:17am
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Western Digital 1 TB Pioneer Noctua NH-U9B Windows 7 Ultimate 64-bit 
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post #3 of 4
Thread Starter 
Hey thanks for the reply!

I 'believe' I'm using a CM Hyper 212+, not a EVO. Right now my BLCK is only 160 x 24. Should I lower the multiplier to get the BLCK higher? At that point it becomes a matter of RAM speed I guess.

Is there any trick to knowing when you should bump the Vcore up a notch as opposed to the QPI/VTT voltage? I imagine, with the temps I'm getting with this cooler, that if I have to bump the Vcore up too much more I'll just stick with 3.8 to stay under 80 degrees. I'd love to hit 4.0 Ghz if possible though.

Rick.
post #4 of 4
Yes, you should lower the multiplier to get the BLCK higher, you can still achieve the same or close to the same overclock with a higher BLCK.

It depends on if you BSOD and get a error code listed in this overclock.net link:

Common Bluescreen of Death Error Code List for Overclocking

If you don't get any BSODs at all, it's going to be quite difficult as to seeing if the QPI/VTT and or Vcore needs to be bumped by a notch or more.

Generally I'd try upping Vcore first then if that totally fails, I'd attempt to up the QPI/VTT voltage by a notch or more, if both by themselves fail, then I'd try upping both voltages then.
Edited by benjamen50 - 3/13/14 at 12:58am
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Western Digital 1 TB Pioneer Noctua NH-U9B Windows 7 Ultimate 64-bit 
MonitorKeyboardPowerCase
Dell Monitor Logitech G110 Antec 750W Thermaltake Aluminium Old Case 
MouseMouse PadAudio
Logitech G500 Gaming Mouse Generic Mousepad Soundblaster 5.1 VX 
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Gaming Computer
(19 items)
 
   
CPUMotherboardGraphicsRAM
Intel Core 2 Quad Q6600 Asustek P5Q-PRO Nvidia 9800 GTX+ Kingston DDR2 8gb 
Hard DriveOptical DriveCoolingOS
Western Digital 1 TB Pioneer Noctua NH-U9B Windows 7 Ultimate 64-bit 
MonitorKeyboardPowerCase
Dell Monitor Logitech G110 Antec 750W Thermaltake Aluminium Old Case 
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