Overclocking an E6600

division72

division72

division72

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26 Jan 2008
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39
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Birmingham
I have the following kit:

Core 2 Duo E6600
Asus P5ND2 SE motherboard
2Gb of Corsair Value Select 667MHz memory (set timings at 5-5-5-15 @ 1.8v)

The problem that I am having is that I can't get an FSB of higher than 285MHz.Iif I try to go higher, the computer locks up on the bios display screen, meaning I have to clear the CMOS to get back onto it. I have tried increasing the Vcore up to 1.38 Volts, and have swithced off speedstep, but it doesn't seem to be working. I kept the memory at it's rated speed and voltage to make sure that it isn't the cause. Does anyone have experience with this board as there doesn't seem to be much info about O'cing with it, as I'm completely stuck.
 
I'm only going by the SPD reading in CPU-Z for the memory voltage as I can't fine any info on Corsairs website to say what it should be running at, but it is riunning stable at that voltage. I've managed to get up to 2.68Ghz on the stock vaotage (which fluctuates between 1.344V and 1.36V at full load) by upping the northbridge from 1.4V to 1.5v (only two options in the bios 1.4V or 1.5V).

Trying to go further by upping the VCORE (from 1.36V up to 1.412V) had no effect (almost boots into windows but crashes), so now I'm stuck.

Would switching to faster 400MHz corsair XMS2 memory be better, or is the value select stuff holding me back.

P.S. I'm using an Arctic Cooling Freezer 7 Pro cooler, by the way.
 
Last edited:
Thanks - upping the DRAM to 1.9V got me through that part, boots into windows and completes a session in ORTHOS (@297.5MHz FSB).

Now gone for the 300Mhz FSB, and got the same problem. Upped the DRAM all the way to 2.1V (as high as it can go). Boots the BIOS screen but crashes while booting into windows. Also tried upping the Vcore to 1.425V but no joy.

Any ideas? :confused:
 
I'm using the option which allows me to seperately change the FSB and the memory speed (keeping the memory speed @ 667Mhz) and just upping the FSB.
 
I've solved it. For some reason the memory speed had increased even though I was using the option to tweak the CPU and memory speeds independently. I tried reducing the memory to a 1:1 divider and hey presto it booted and everything seems OK. So that must mean that my RAM was overlcokced as far as it would go, and that is why I could go no further. Still, it's good to know that my RAM will go up to 730Mhz (up from 667Mhz) and run stable!
 
I'm now up to 2834MHz with the following settings:

FSB = 315Mhz x 9 (stock Vcore)
Memory = 5-5-5-15 timings @ 1.9v running with a 1:1 divider

My Pc boots into windows OK, but after about an hour of running Orthos, my PC had restarted itself automatically.

Is now th eitme to start upping the Vcore, and if so, what is the best way of finding what my stock voltage is?
 
I also ran memtest to see of it is the RAM causing the problem, and it reported 1 error. I decided to set the timings back to auto in the bios and ran memtest again. On returning to my PC I found it had restarted itself. Should I perhaps try increasing the voltage on my RAM or do you think the Value Select stuff just isn't up to OC'ing.

I'm already thinking of upgrading to some better quality PC2-6400 RAM, maybe some OCZ Platinum (on overclockers for about £30.).
 
I've managed to get up to 315Mhz FSB, but trying to go up to 320MHz causes my system to restart itself when running the Orthos blend test or memtest. I tried lowering the divider but that caused my system to fail to POST, so now I'm stuck.
 
Update:
I have replaced my ram with 4Gb (2 x 2GB) of OCZ 800MHz Vista Gold Series. Set the timings at 5-5-5-18 with the voltage at auto

Ran Orthos and memtest @ 315MHz x 9 and it passed both. Upped the FSB to 320MHz and I'm now getting problems with random restarts. It happens either as soon as I enter my password on the Windows log-in screen, or, when I've got to my desktop and start any application. I tried upping the Chipset voltage from 1.4V to 1.5V and also upping the DRAM up to 2.0V with no improvement to the situation. I put the FSB back to 315MHz and now everthing is fine.

Any ideas would be appreciated.
 
My BIOS doesn't give me the option the reduce the multiplier. The other odd thing is that it doesn't like running the memory faster than 1:1. Even putting the RAM 5MHz faster than the FSB causes it to fail to POST. I'm fairly convinced that my mobo just isn't up to OC'ing and I'll just have to stick with the 315MHz FSB.

Ho-hum.
 
What's the HT voltage/I can't find that in the BIOS. Also what BIOS revision should I use?

Just to be on the safe side, would my 500w PSU be giving me any problems?
 
I'm having difficulty working out what my Vcore actually is before I start upping it. The bios and cpu-z says it was 1.37v. So I went into the bios and switched the vcore form "Auto" to 1.375v (nearest to 1.37v). When I booted and checked CPU-Z it then read 1.42v (?). I tried to run orthos but it failed after 10mins. I'm going to try upping the vcore a notch and running orthos again until I'm stable (9x315MHz). I'm assuming (dangerous I know) that on auto the voltage increases itself under load (I have C1E and Speedstep disabled) and was actually much higher. Also, what effect would increasing the CPU Termination Voltage have? (I tried googling it and got various different answers - FSM voltage, HTT voltage, etc?????)
 
I don't have the option of the HT voltage. I have:
DRAM Voltage - currently at 2.000V
Chipset voltage - currently at 1.4V
CPU Termination voltage - currently at 1.3V
Vcore - currently at 1.365V

And I'm stuck.
 
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