Unstable overclock PSU maybe?

Bigdogbmx

Bigdogbmx

Bigdogbmx

Associate
Joined
25 Sep 2003
Posts
456
Location
Leeds
Ok heres my problem, sometimes I can get my CPU to 3.2 (Specs below) and its fully stable, and sometimes Ill set it to the same speed, and the system will start, POST, reboot and come up with default clock settings. The wierd part is that if it does get to windows with the OC its totally fine, Prime tested for hours, temps all about 40-45°c.

This is the setup anyway:

Q6600 G0
Gigabyte P35 S3G
2GB OCZ PC8000
2x1GB Cheapo PC6400
Radeon 4850 512mb
Hiper Type-R 580W
Water loop of Laing D4, D-tek Fuzion and 1 120mm fan on a 3 fan Rad.
1 120mm case fan

Speedfan is reporting the rails to be running at:
+12v = 12.29v
+5v = 5.08v
+3.3v = 3.39v

I should add, I have turned off detect legacy USB devices already. Come to think of it the problem used to happen if I had my external USB HDD plugged in, and removing it would let the OC become stable.
I am wondering now if the fairly recently installed water loop is sucking too much power for the PSU. Its a decent PSU but only 580W which these days isnt that great I suppose.
 
Last edited:
Ah sorry, RAM at 2.1v just because the OCZ is meant to be run at that, CPU at 1.5v just because I get a massive vdrop and vdroop on this MB and chipset at +0.2v whatever that makes it.

RAM is underclocked a little to 712MHZ or so as well because its over 800MHZ at normal divider.
 
If your RAM is underclocked, and getting enough volts. Try increasing NB/chipset voltage slightly. Watch temps though. What fsb are you running 1600 x8?
 
The chipset is already at +0.2v, only options are +0.1, +0.2, and +0.3. FSB is 356 x 9. Do you think its worth dropping the multi and raising the FSB?
 
You might try. Sometimes fsb "holes" can appear on certain boards with certain processors. You can try 1600 fsb (400) with an 8x multi. I have no idea about your board, so am unable to help you further.
 
I had a problem, E6300 that worked at 2.45 and nicely stable.
then it rebooted on post, default settings, unclocked.
GA mobo.
anyway have you got an external harddrive or printer plugged in via USB that has storage devices on it??
if so unplug it and try it out. if that works change your BIOS settings to not look for legacy USB storage devices.
mine is now sorted, boots with my 1TB ext drive plugged in and runs happily at 2.8ghz/1600FSB
 
Yeah I did have the exact same issue with this board before, (as I mentioned in the first post ;)) but it happens now wether the drive is there or not, and also when the legacy storage device detect is off in the BIOS. Anyway I just did as cje suggested and upped the FSB to 1600 and dropped the multi to 8 and without wanting to speak too soon, it seems stable. :cool:
 
You must log in or register to reply here.
Back
Top Bottom