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PCI-E bus overclock???

post #1 of 10
Thread Starter 
Hey i know that when overclocking you should lock the PCI-E bus at 100mhz because it grows exponentially with the FSB. but my BIOS allows me to increase the PCI-E bus speed by 1mhz at a time. Will i get any kind of performance boost by increasing PCI-E bus speed?
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The Doombringer
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post #2 of 10
i asked the same question along time ago and was told not to mess with it and that it would not help

i found this to be interesting to support what i had been told in the past, http://www.nbsgaming.com/PCIEBus.html
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post #3 of 10
Quote:
Originally Posted by THEBREN View Post
Hey i know that when overclocking you should lock the PCI-E bus at 100mhz because it grows exponentially with the FSB. but my BIOS allows me to increase the PCI-E bus speed by 1mhz at a time. Will i get any kind of performance boost by increasing PCI-E bus speed?
It's rumoured (and i repeat rumoured) to help get higher overclocks on GPU's. But it's not worth the hassle, not only can you inherantly damage a given GPU but you can also corrupt SATA hard disks.
 
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post #4 of 10
In some cases, when running really high OC's, a PCI speed of 110-112 can help stabilize the OC. I run mine at 105mhz. Anything up to 110 or so is usually considered fine. I don't think there is much of a performance difference either way. I would run some benches at 100, 103 and 105 and see if there is any increase.



edit: I agree that it is a rumor as I have never seen actual proof that it works. The main reason I have mine at 105 is so I can feel comfortable that I have one more thing overclocked.
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by dralb View Post
The main reason I have mine at 105 is so I can feel comfortable that I have one more thing overclocked.
~ Amen brother
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post #6 of 10
It shouldn't make a difference because PCI-E has 2GB/s transfer and it is not even fully utilized yet. Overclocking the bus to increase transfer rate would not help because the video card would bottle neck it...
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post #7 of 10
Thread Starter 
yeah based one the stuff I've been reading it doesnt do anything to OC it, maybe a few frames more here or there but it can mess up your SATA drive and Southebridge i guess. Also it bottlenecks the clock cycles. Makes a pretty good Overclocking myth though.
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post #8 of 10
Quote:
Originally Posted by Kipper View Post
It shouldn't make a difference because PCI-E has 2GB/s transfer and it is not even fully utilized yet. Overclocking the bus to increase transfer rate would not help because the video card would bottle neck it...
Could you explain why you say the video card would bottle neck it? Thanks.
post #9 of 10
Thread Starter 
cuz the PCI-E connections have a certain bandwidth, its not like the FSB which is really flexible. I found out that back with AGP cards upping the AGP bus would give you a boost in performance
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post #10 of 10
i found increasing it on my 650 board worked a treat but this mobo hates it for some reason.
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