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Noob overclocking: Intel 875k

post #1 of 2
Thread Starter 
Hello, all,

Help me do this better.

I built a new box in November of last year based on the 875K and the Asus P7P55D-E Pro. (I entered all of its specifications here somewhere, but not knowing how this forum works yet I don't know where that all went. Perhaps in my profile?) Anyway, my goal was to balance low noise with overclocking for the sake of improving Folding@home performance; to that end, I originally overclocked it simply by boosting the multiplier to 27 and increasing the core voltage to 1.1625V -- the highest it seemed to stably go while staying quiet and not having to kick the voltage up too much.

Yesterday I updated the BIOS to version 1602, and while I was there I decided to play around with overclocking via BCLK and multiplier to see what would happen to my Folding@home (-bigadv units) performance if I were to increase the BCLK while keeping my CPU speed around 3.6. So I upped my BCLK to 160 and lowered my multiplier to 23, resulting in a clock of 3695mhz. It's roughly a 2.8% increase in clockspeed, but my WU performance in Folding@home has gone up by close to 5%. More than that, this speed is stable faster than I could go just by adjusting the multiplier. Interesting.

Anyway, I know next to nothing about BIOS settings for overclocking, but here's what I have:
Code:
AI OC Timer: Manual
OC from CPU Up: Auto
CPU Ratio: 23
SpeedStep: Disabled
Xtreme Phase Full Power: Auto
BCLK: 160
PCIE: 100
DRAM: DDR3-1600
QPI: 5761
DRAM: Auto
CPU Differential Amplitude: Auto
CPU Clock Skew: Auto
CPU Voltage Mode: Manual
  Fixed:  1.175V
IMC Voltage: Auto
DRAM Voltage: 1.5V
PLL Voltage: Auto
PCH: Auto
DRAM CHA: Auto
     CHB: Auto
Load-Line: Auto
CPU Spread Spectrum: Auto
PCIE Spread Spectrum: Auto

C1E: Disabled
Hardware Prefetcher: Enabled
Adjacent Cache Line Prefetch: Enabled
CPUID Value Limit: Disabled
Virtualization Technology: Enabled
TM Function: Enabled
Execute-Disable Bit: Enabled
A20M: Disabled
SpeedStep: Disabled
C-State: Disabled
That seemed to be all the relevant information given in the BIOS. Given that, are there things I can optimize whilst avoiding increasing heat? It seems that using the BCLK in addition to multiplier is, in fact, a more ideal way to overclock the 875K, but beyond that I know nothing. All the fans in my system are in "silent" mode in my BIOS and I'd love to keep it that way, but if I can tweak settings and go higher, I'd love to. For all I know I could even go higher right now with these settings just by manipulating the BCLK further, but I wanted to post to see if I'm on the right track.

A penny for your thoughts?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 875k Asus P7P55D-E Pro Gigabyte GTX460 SOC 8GB (2x4GB) G.SKILL Ripjaw DDR3-1600 1.5V 
Hard DriveOptical DriveOSMonitor
OCZ Vertex 2 120GB, WD20EARS Lite-On DVD-RW 24x lightscribe Windows 7 x64 SP1 Samsung 244T 
KeyboardPowerCaseMouse
Apple Mac Pro SeaSonic X-650 Lian-Li Lancool PC-K7B Logitech (laser, corded) 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 875k Asus P7P55D-E Pro Gigabyte GTX460 SOC 8GB (2x4GB) G.SKILL Ripjaw DDR3-1600 1.5V 
Hard DriveOptical DriveOSMonitor
OCZ Vertex 2 120GB, WD20EARS Lite-On DVD-RW 24x lightscribe Windows 7 x64 SP1 Samsung 244T 
KeyboardPowerCaseMouse
Apple Mac Pro SeaSonic X-650 Lian-Li Lancool PC-K7B Logitech (laser, corded) 
  hide details  
Reply
post #2 of 2
Guides are your friend.
http://www.overclock.net/intel-cpus/...ed-guides.html
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