What is holding me back (Asus P4C800)!?

[Nerevarine]

Ok....first my system:

MB: Asus P4C800 (not Deluxe, just P4C800).
CPU: P4 Prescott 3.2GHz D0 stepping.
RAM: 2x512MB Gskill PC4400 TCCD chip, 277MHz @ 2,5-3-3-7
CPU cooler: Asetek Waterchill Antarctica, dualradiator with 2 120mm Adda fans and the Hydor L30 pump.
VGA: PNY GeForce 6800 Ultra
PSU: OCZ PowerStream 520

...and some other stuff.

Anyhow....this system should be able to clock pretty well I think...but still, something is holding me back. I'm guessing that it's settings though, and not hardware.

I run my memory in 1:1, since they are guranteed to do 277MHz with decent timings. The power supply is one if the best on the market. The temp on my CPU under full load with 1.55Vcore and 240 FSB is stable at 40 degrees.

Anyhow....If I run Prime95 with my current 240 FSB I get a critical error after only a few minutes. I have tested another motherboard, and there I could go higher on the Vcore, when I set 1.65V in the bios, it showed about 1,6V on the monitoring, and then I could run Prime without problems at 250 FSB....with my current Asus MB it wont post over 1,6V in bios, and that is about 1,55V in the monitoring.

What is the reason it wont post with over 1.6V? Like I said, that's only 1,55V anyway...and I need more to go higher. What should i do?

[Gk22CoE]

240x16=3840 which is prolly the limits of your cpu

if you really want high bandwidth u need a cpu with a low multi like the 2.4c

[Nerevarine]

I am sure it's not the CPU, like I said I could run that exact CPU stable in Prime95 with 250 FSB...that is 4GHz. Only that was on another MB, where I could post with higher Vcore....and I wanna know how I'm gonna be able to get a higher Vcore on my current Asus MB as well.... With just 1,6 actual volts, 250 FSB shouldn't be a problem.

[musk]

There is a very lengthy thread about OC prescots on OCForums. Basically, there are powerplant issues with these boards and pressies. They are not built to handle the huge draw that these chips require when OC'd. A droop mod will help a bit with your vcore stability, but with that board, most are adding capacitors to stabalize and reduce heat to the mosfets.

I also believe that the bios limits you on the vcore with a prescott and won't let you go too high. Are you wanting higher vcore or just more stabile vcore?
Do the droop mod.

Try one stick of RAM and see if that helps. I am guessing it wont but if it does maybe up your NB voltage.

Link to post


Hows that for a jumbled answer.

Good Luck!

musk

[Nerevarine]

Thanks for the help!

Guess I'll just have to do the droop mod and ad some capacitors then....just have to gather more exact info on how to do that first. I have voltmodded before, so it shouldn't be a problem.

[ed.howell]

What bios are you using? I am using 1019 and I can select voltages up to 1.9 with my Prescott. Although I never would!!

Also, that thread on ocforums, I don't think anyone has actually done a cap mod to the Asus mobo's yet, I think a couple of people are waiting to get their boards back from someone modding them. I have thought about doing it but I really don't want to have to cut holes in my mobo tray to clear the new caps. I know there are a couple of people with Abit boards cap modded though.

It's definately a thread to read though. Very educational.

[uclajd]

I have thought about doing it but I really don't want to have to cut holes in my mobo tray to clear the new caps.

Actually, I found a trick around that Ed: Double standoffs.

The only thing is that the metal bracket for the ports won't fit, and the vid card can't be screwed in, but if you use double mobo standoffs, there is enough clearance for caps without any mobo tray hacking, if the caps are laying sideways of course.

BTW, what's this about the 1019 BIOS? Must be different from the P4P800, which is limited to 1.6v.

[dragonhunter]

I had the same problem w/ my asus mobo. 1.625v, 1.65v no post but 1.675v+ it post