Overclock Help

oceaness

oceaness

oceaness

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I'm curently in the progress of overclocking a friends server.

It started as a 3000+ Venice 200 x 9 = 1800mhz @1.4v

I'm now posting this message at 275 x 9 = 2475mhz @1.520v. It's set to be 1.550v but I guess the PSU isn't too brill, considering the BIOS has a 1.525v setting as well and it's lower/nearer that :(

The memory is on a divider (CPU/11) at 225mhz at 2.8v

The one problem is that it keeps failing Prime95's Blend Tortue test.
 
Undervolting is generally due to the voltage regulators on the motherboard rather than the PSU.

Have you tried backing the ram down a bit (or slackening the timings) to make sure it's the CPU that is causing Prime to fail rather than the CPU?

Probably worth taking it to the bods in the overclocking section as there will no doubt be a lot more experience with the particular CPU/Board there.


Good luck with it :)
 
I managed to get into windows at 2700mhz (not bad from 1800) with the motherboard at 300 FSB (high as it went :() RAM Divider at 2700/14=192mhz and the HT at 300*3=900mhz.

I wanted 311 FSB, 311*9=2799
2799/14=199.9mhz RAM (3,3,3,8 if it's running at 200mhz it shouldn't need looser timings?)
and 311*3=933mhz HT.

The CPU and RAM are both set at the max voltage they can be and the CPU runs at 40C at full load.
The HT shouldn't need more voltage because it's running slower than intended. However the chipset could probably use a boost considering it's at 300 rather than 200. Problem is though the heatsink has the smallest surface area I've ever seen and a normal small NB fan so the fan is having little effect because the heat is pretty much all in the chip. So I'm wary of pushing any extra volts through it especially combined with the huge FSB increase. I wish it were as simple as getting a new NB heatsink and fan but it's right at the end of the PCIe graphics card which clears the heatsink and fan by about 1.5mm :'(

I think the chipset is getting to hot which is cause the instability, but I'm really at a loss cause of the graphics card.

I had to let him take it away at stock for now as it turns out one of the 512 DIMMS was kaput.
 
Have you touched the chipset to find out if it's actually hot?

What's the mobo? Generally A64 chipsets don't get that hot as the memory controller is in the CPU. The exception is some of the nForce4 mobos which can heat up quite nicely.
 
The one problem is that it keeps failing Prime95's Blend Tortue test
Click to expand...

If it gets into windows but fails Prime95 small fft test then your overclock as AFAIK is unstable....

It matters when gaming or stressing the CPU.....can lead to crashes and you could lose important info if that happens....
 
Yes I realise. I think it's the chipset overheating that is very difficult to do anything about though looking around the forum I've seen a Jing Ting Force Chipset Cooler and am waiting for the new revision when it comes around :D
 
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