CPU overclock works "sometimes"

X1800XTTOP · Sep 16, 2006, 10:18 AM

Hello guys!

I´m overclocking a CPU for the first time ever. Well, i have the AMDX2 4400+ and using the A8R-MVP motherboard.

I found that the CPU at 2.5ghz was stable (did 24h prime95 without any errors). Settings are as follow;
CPUfreq:228
Multiplier: 11
vcore: 1.4V
RAM: limit 183, 2.5-3-3-6 @ 208mhz 2.8V
HTT: 800mhz

My problem is. After every boot where i have turned the computer off (not after a simple reboot).. my cpu freq will do down to 2.04ghz and my memory to something like 168mhz. If i reboot, they get their correct values. The BIOS reads everything correct at all times. Why does this happen?

I dont have any AMD C&Q driver installed (i have the dualcore optimizer installed though). Cool&quiet is also disabled in the BIOS. I also dont have any program that changes these things in windows (i did everything through the BIOS).

I´ve read 2 big guides on overclocking before i tried it myself, but i´ve never read anything about this before.

Also, the "RD 480 HT PLL" setting - its set to "Fast" atm.. is that correct? I have googled for this like crazy but havent found any answer of what it does or should be set at.

Thanks

Edit: whops - this should probably be in the overclocking-subforum instead. So sorry.

Bar81 · Sep 16, 2006, 11:28 AM

What PSU?

X1800XTTOP · Sep 16, 2006, 12:45 PM

The Silverstone Strider 600W.

The clocks it "underclocks" to varries depending on what CPUfreq. i use. E.g. when its 228 - it sometimes reduces to 2.04ghz (as i said before).

If i choose 227 - it "only" reduces to 2.19 (i think), and memory to something ~190.

I´ve manually set all settings - nothing is on "auto".

Bar81 · Sep 16, 2006, 01:15 PM

Plenty of juice. Seems weird. Latest BIOS?

X1800XTTOP · Sep 16, 2006, 02:13 PM

Yes, latest BIOS.

Bar81 · Sep 16, 2006, 02:48 PM

Well, must be something peculiar to the board then. Did you check the stickied thread at the top of this forum? Sorry I can't be of any help. Good luck.

X1800XTTOP · Sep 16, 2006, 03:01 PM

Dont worry, thank you so much for trying - i apprechaite it.

If anyone else knows ssomething i can try.. please do tell.

For anyone else having this problem;
Its a problem with the latest BIOS for the A8R-MVP. The 0402 Bios works perfectly.

To revert back to that BIOS, install the original asus update that is on the CD you got with your A8R-MVP - and then download the old bios from asus.com. Make sure "bios downgrade" is ticked in the optons-page of that program and flash it back until a new bios that fix that issue is released.