875K Overclocking Low Limits?

trentlad

trentlad

trentlad

Soldato
Joined
7 Feb 2010
Posts
3,747
Hardware
CPU: Core i7 875K
Mobo: P55 EVGA 200 Classified
RAM: GSkill Sniper DDR3 1866 (but website says SPD = 1600)
CPU Cooler: Hyper 212 (air)
OS: Win 7 64-bit
I'm venturing into the world of overclocking and trying to follow a few guides (video + article) but I'm doing something wrong.

Essentially the video recommends:
CPU Freq. = increases CPU clock and inevitably memory clock
CPU Multiplier = increases CPU clock without increasing memory clock
Bootup CPU VCore = 1.325V
Eventual CPU VCore = 1.325V
DIMM Voltage = 1.65V
Bootup CPU VTT = 1.4V
Eventual CPU VTT = 1.4V
CPU PLL = 1.875V

[CPU Confg.]
C1E Support = Disable
SpeedStep = Disable
Turbo = Disable
C-State Tech = Disable

[Mem Config.] <- matched the RAM timing
DRAM SPD = Standard
DRAM Freq. = 1600 MHz <-- offset to allow
tCL = 9
tRCD = 10
tRP = 9
tRAS = 28
Command Rate = 2
Seemed like recommended voltages weren't too extreme and a nice starting point to play around with the multiplier and frequency. WRONG!

Increasing the multipliers doesn't seem to have any effect in Windows (looks fine in BIOS) it reverts to the default 22, so after a little research it seems the "apparent" fix it:
C1E support: disabled
Intel Speedstep Tech: enabled
Turbo Mode: enabled (when i fix the Multi to x31, this option must be disabled, i think so)
C-state tech: enabled
C3: disbaled
C6: enabled
Even with these settings I can't get Windows to start at all. :(

The most I've managed is a lousy 3.9 GHz and it's not even slightly warm using these settings:
CPU Freq. = 175
CPU Multiplier = 22

I can't seem to go anywhere over that, it just fails to boot to windows when I try. What's going on? I'd love to get this to a point where heat becomes an issue because it's not even allowing me to go up and I don't know if the VCore is safe to go higher? Do they say 20% above the standard VCore level is safe?
 
Last edited:
You beauty! This looks like the absolute perfect guide.

I had about 50 tabs open searching for 875K overclocking guides and didn't come close to finding this quality.

Thank you so much!!!
 
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