q9550 oc voltages-having problems

Nocky24 · 26 Jan 2010 at 18:18

Whenever i try setting CPU PLL to 1.56v and FSB termination voltage to 1.14v (i didn't want to go any higher) my pc fails to boot properly after exiting the bios. Yet i can power everything down, cold boot and run 10 minutes of prime stable without any problems. Hows that work? Are the voltages the problem here or is it something else?

So far my settings are:

FSB: 424MHz
PCIe: 100MHz
FSB strap: Auto
DRAM Freq: 848MHz
DRAM Timings: Auto

CPU Vcore: 1.26250
FSB Termination Voltage: Currently Auto'd
DRAM voltage: 1.80v
NB Volts: Auto
SB Volts: Auto
CPU GTL: Auto
CPU PLL: Currently Auto'd

setter · 26 Jan 2010 at 18:56

When i ran my q9550 p5q deluxe combo, i had to raise both NB and FSB to 1.26, pll was at 1.54 iirc, theese are well within the safe limits for the q9550. Maximum reccomended voltages are.

NB, 1.4v
FSB, 1.4V
PLL, 1.6V

Nocky24 · 26 Jan 2010 at 19:10

setter said:
When i ran my q9550 p5q deluxe combo, i had to raise both NB and FSB to 1.26, pll was at 1.54 iirc, theese are well within the safe limits for the q9550. Maximum reccomended voltages are.

NB, 1.4v
FSB, 1.4V
PLL, 1.6V

Cheers setter

are those max volts for a 45nm E0 stepping?

fishfishfish · 26 Jan 2010 at 19:14

There are also some settings in the post here. Mine's currently on 3.7 if I recall correctly. It's been stable like that for over a year with no problems, and it's the C0 stepping. http://forums.overclockers.co.uk/showthread.php?t=17926830

setter · 26 Jan 2010 at 19:29

Nocky24 said:
Cheers setter are those max volts for a 45nm E0 stepping?

Yep, id also sick to those with a CO as well, the settings of 1.26 for NB andd FSB and PLL of 1.54 were what i ran for 3.8ghz (450 fsb).

Nocky24 · 26 Jan 2010 at 19:36

Cheers

Should i set the SB volts and PCIe volts to default as well? I can't see the need for upping them, but then again i'm a bit of a noob so please say aha.

setter · 26 Jan 2010 at 19:39

I left those on auto all the time.

Nocky24 · 26 Jan 2010 at 19:44

setter said:
I left those on auto all the time.

Good stuff, seems like i've got it to 3.8GHz stable with those settings. Just need to do some testing, but so far it looks a lot more promising. Cheers again setter

setter · 26 Jan 2010 at 20:10

Glad to offer advice, give it a good workout with linX/IBT/prime95 to check all is running ok.