i7 920 CO/C1 Overclocking

Frosties · 24 Nov 2010 at 10:41

Hi this is my first post on overclockers so be gentle

I currently have a 920 C0/C1 stepping and I'm venturing into overclocking. I'm looking to achieve a decent overclock for 24/7 something around 3.8 Ghz (maybe 4

) on air.

I just want some opinions if it's worth upgrading to a 920 D0 stepping or 930/950, would like to keep the vcore at a minimum, possibly something in the range of 1.25 - 1.28.

I have tried to overclock my 920 but the vcore was a bit high at 1.35 although the temps were fine even when gaming, didn't try any stress programs yet.

Is it worth upgrading or its safe to leave the 920 at 1.35v 24/7?

cmndr_andi · 24 Nov 2010 at 11:48

I certainly wouldn't upgrade that CPU to a D0 version. You may be able to get a slightly higher overclock 200-400MHz - but in the scheme of things this is only ~5% more.

The C0/C1 i7 chips are not the same as D0 stepping chips in terms of overclocking - 1.25-1.28 may be enough for a D0 to get it to 3.8-4GHz, but this isn't the case with the C0 - you need to put in more, this is normal. Also, they tend to top out at ~3.8GHz, so I wouldn't bank on 4GHz, however the real-world performance difference is tiny.

nmsraider · 26 Nov 2010 at 07:32

hi there i have the co/c1 stepping, and have ran mine stable for over a year now at 4009.2mhz the voltage does have to be a lot higher than on the do/d1 but if you want some settings feel free to message me.

Frosties · 26 Nov 2010 at 08:36

Hi nmsraider

What's your setup? Could you share your settings please

I'm running on Asus P6T Deluxe v2 with 6x1GB Corsair Dominator @ 1600 Mhz and for cooling the CPU I have a Thermalright HR-02 together with a 140m silent fan.

Thanks!

nmsraider · 26 Nov 2010 at 14:39

well i am running like this
Ai Overclock Tuner - Manual
CPU Ratio Setting - Auto
Intel (R) SpeedStep (TM) Tech - Enabled
Intel (R) Turbo Mode Tech - Enabled
BCLK Frequency - 191
PCIE Fequency - 100
DRAM Frequency - ddr3 1531
DRAM CAS# Latency - 9
DRAM RAS# to CAS# Delay - 9
DRAM RAS# PRE Time - 9
DRAM RAS# ACT Time - 24
CPU Voltage 1.41875
CPU PLL Voltage - Auto
QPI/DRAM Voltage - 1.31250
IOH Voltage - Auto
IOH PCIE Voltage - Auto
ICH Voltage - Auto
ICH Voltage - Auto

DRAM Bus Voltage - 1.50
DRAM DATA REF Voltage on CHA - Auto
DRAM CTRL REF Voltage on CHA - Auto
DRAM DATA REF Voltage on CHB - Auto
DRAM CTRL REF Voltage on CHB - Auto
DRAM DATA REF Voltage on CHC - Auto
DRAM CTRL REF Voltage on CHC - Auto

Load-Line Calibration - Enabled
CPU Differential Amplitude - Auto
CPU Clock Skew - Auto
CPU Spread Spectrum - Auto
IOH Clock Skew - Auto

i have the i7 920 c0/c1
Motherboard:
p6t deluxe v2
RAM:
Corsair XMS3 6GB 3x2GB DDR3 PC3-10666C9 1333MHz,
Power Supply:
thermaltake 950w modular
Graphics Card:
2 x radeon hd5850 1g ddr5 in crossfire oc'ed to 850\mhz core 1200Mhz memory
Hard Drives:
3x sata2 250g
Cooling:
Thermalright Ultra-120 Extreme
Case:
thermaltake
and a load of fans
If you are unsure of these settings i would start lower and build up as not all cpu's will run the same. here is a good guide to overclocking your chip but bare in mind this is for the d0 so you will need more cpu v to run stable. any further questions feel free to ask.
this is what i run at 24x 7 but it also runs @ 4200.8Mhz with same setting just by changing the BCLK fre. to 200 but on my system runs slightly warmer than i would like.
http://www.clunk.org.uk/forums/overclocking/22106-core-i7-overclocking-guide-beginners.html