PCIe bus speed and voltage

procupine14 · Nov 14, 2007, 12:34 PM

i was wondering is there was a recommended bus speed and voltage for my oc'ed card that may yeild an even higher OC than i currently have

**ChaosMinionX** · Nov 14, 2007, 02:03 PM

i run 120mhz on my PCIE

procupine14 · Nov 14, 2007, 02:04 PM

ok cool

Zelig · Nov 14, 2007, 02:41 PM

Negligable difference in performance, run some benchmarks if you're doubtful.

PangingJr · Nov 14, 2007, 02:47 PM

PCIe freq at 120MHz is may not be too high on one motherboard platform, but it can be too high and cause damage to some different platform, different system configuration, likes RAID sets, SATA drive corruption.

**ChaosMinionX** · Nov 14, 2007, 08:41 PM

Quote:

Originally Posted by PangingJr

PCIe freq at 120MHz is may not be too high on one motherboard platform, but it can be too high and cause damage to some different platform, different system configuration, likes RAID sets, SATA drive corruption.

Quite possibly

Most recommend 100-110mhz I would go with that if your unsure.

procupine14 · Nov 15, 2007, 12:44 PM

AH....well good thing ihaven't messed around with it yet lol

Just Learnin' · Nov 15, 2007, 03:20 PM

I get major benefits at about 135MHz in 3DMark benchies, that is with an IDE drive. The best I can do running a RAID or SATA drive is 114MHz with the same board or it won't "find" the drive to boot.

procupine14 · Nov 17, 2007, 05:46 PM

gotcha thanks all

H3X4D3C1M4L · Nov 20, 2007, 10:46 PM

Quote:

Originally Posted by PangingJr

PCIe freq at 120MHz is may not be too high on one motherboard platform, but it can be too high and cause damage to some different platform, different system configuration, likes RAID sets, SATA drive corruption.

Not on modern motherboards. It used to be the case but they all plug directly into the northbridge now. The only risk is damaging anything plugged into the PCIe slots themselves, but PCI-e is far far far less frequency sensitive than PCI was.

IIRC some nVidia cards were fine up to 150MHz and ATI's up to 130 or so (they have a "happy" setting and everything else except that and stock yields no gain), but that was long ago. You've still got alot of bandwidth to play with, more than you'll ever need, so if it ain't broke

PangingJr · Nov 21, 2007, 05:02 AM

really? it's still create problem with my onboard sound and RAID. may be so what's next my board is old or it sucks.

H3X4D3C1M4L · Dec 22, 2007, 06:17 PM

Quote:

Originally Posted by PangingJr

really? it's still create problem with my onboard sound and RAID. may be so what's next my board is old or it sucks.

Probably. The best parallel I can draw to it is AthlonXP boards. The last of them had integrated SATA (because SATA got hot just as the AXP's were being phased out), but most of them were just plumbed into the PCI bus along with GBe and such, and changing the PCI frequency (i.e. if you had control over it only with a divider and not a frequency lock) would cause issues because those devices got clocked higher along with it.

These days most things are plumbed right into the northbridge... so as long as that stays cool everything is fine.

Also consider that even a year or so ago, boards were not nearly as OC friendly as they are today. Manufacturers expect people to be OCing these days more than leaving it alone. Just look at the memory market for example. Hardly anything in the high end that is sold is JEDEC spec compliant