Advice

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Blyths

New member
Hi all,



I have just got a used custom Mach 11 (Thanks Stocky) and seem to have hit my OC limit.



This is my setup



P4C800-E

P4 Northwood 3.4 (478)

OCZ 2x512 2.5 4-4-8



I have managed to O/C to 4.08Ghz using



Cpu FSB 240 x 17 locked

Dram fre - 400

Agp/Pci - 66.66/33.33



Vcore - 1.80

DDR v - 2.85

AGPv - 1.60



My temps are Evap -44 / Cpu(asus monitor) -26 running norm.

-36 / -18 after 3Dmark05



Are these ok?



If i try to increase the FSB anymore the system will crash or wont boot. Do you think i have reached the limit with this setup?



Thanks for your help/Advice



Blyths

 
temps are good - drop in a ram divider and see of you can go higher. Temps look good do contact does not seem to be an issue.

Northwoods are good for 4ghz so u might have hit the limit, even though you have a 3.4, 4ghz seems to be their limit.

Asus mobos are really good but u really need to stabilise the CPU core juice and there is a mod for that - PM me if you want a linky.

Get urself a 3.2 prescott if you can - they'll really fly under mach cooling (probs 4.4Ghz waiting for ya) but that volt mod will go a long way and might even help ya with what you have now.

Warlord Shigs on these forums will do the mod for ya at a reasonable price.

Try a different BIOS.

What psu are you using?

Cheers

MAv
 
I think that the RAM is PC4400, so it shouldn't need a divider yet. I personally prefer running 1:1 for the performance benefit, as your RAM should have more head room yet.

My 3.4 Prescott (in classifieds ;)) ran around 4.7 if I remember right, so it could well be your CPU limit?
 
Thanks for your reply guys,

My Power supply is a Tagen 480w, and Stocky is right my Ram is PC4400.

Is this Vcore Stability volt mod just a Bios update?

Thanks
 
No it's a hardwire mod.

but the later BIOS's also allow for a different multiplier to be used (x14?) which might help (there are otehr fixes too which may help).

Putting the divider in just allows you to concentrate on pushing the CPU so allows you to find it's limits without having to be concerene about any other product.

Using a later BIOS that allows a different multiplieer will help you get the most out of the rig - highest FSB at highest CPU clock.

Good luck
 
That's a good overclock for a Prescott, they get quite toasty!

I wouldn't be surprised if it needs more volts to increase the stability, but things get very hot over 1.6V and the mobo BIOS will have protection to stop this when a Prescott is in the socket. This can be overcome with V-Mod, but from experience is not really worth the hassle for a few MHz...
 
Just checked and I think I was running mine close to 1.75 Volts. I wouldn't do that again though, as it causes too much heat for any practical purposes...
 
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