PCI-e Overclock

Mr_Flibble · 4 Nov 2006 at 19:19

Hi All,

I wish what is a safe maximum for overclocking the pci-e bus before things get risky.
I ask as i have one of the freaky ASUS p5b-vm motherboards and increse of the FSB has to be matched by an increse of the PCI-e bus. So far i have the FSB at 303MHZ and the PCI-e bus at 111MHZ giving me a not too bad 18.884 second super pi with the E6600 running at 2726MHZ
Im sure i can get more out of it if i just increse the PCI-e bus a bit more but im unsure how far i can go.

Also how possible it it to volt mod the motherboard to increase the memory voltage. At the moment im having to run a divider on it presumably because i cant give it enough juice. The motherboard tops out at 1.95v and my memory is rated at 2.1v. So far i feel the motherboard has been wasting the optential of my conroe 6600 and gskill 6400HZ not to mention the watercooliong

Any tips or advice in getting more out of my rig greatly appreciated

Indy500 · 4 Nov 2006 at 19:22

You should leave the PCI-E bus alone. More than enough bandwidth as it is. Stick to upping FSB and keeping RAM at 1:1 ratio with it.

Bearing in mind you're using a value IGP mATX motherboard, thats a good overclock.

Rroff · 4 Nov 2006 at 19:25

Yeah leave the PCI-e bus locked at 100... my RAID array dissapears if I have it OC'd more than a very little and it doesn't give any performance difference.

Mr_Flibble · 5 Nov 2006 at 11:45

Hi thanks for the replys, the problem is that the pci-e lock doesnt actually work on this board i can set it at 100 but i then can only raise the fsb a few MGHz. I have to increase the PCI-e bus to increase the fsb a worthwhile amount.

Unfortuneately it seems asus isnt going to fix the pci-e lock issue
http://vip.asus.com/forum/view.aspx...oard_id=1&model=P5B-VM&page=1&SLanguage=en-us

So looks like im stuck at 2.7 unless i want to risk upping the pci-e - or get a decent matx board if one ever comes out.

Arthalen · 5 Nov 2006 at 21:11

Does your board have any ICH Voltage options ?

I've had my PCIEx upto 120mhz with no adverse side effects, but had to up the voltage on the ICH to 1.20 volts (default 1.05) in order for it to not lose the SATA drives attached to my system.

Also, upping the PCI-Ex can help push FSB's on certain Pentium4 and PenD chips... unsure about Conroe though.