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pci Express Frequency

post #1 of 22
Thread Starter 
Hi ,

I see in my BIOS (ASUS P5LD2) ad Juperfree setting when overclocking ,
PCI Express Frequency (90 - 150) ... What should I do with these settings?
I have it at auto at the moment. I have a ATI x1600Pro 128mb/128mb
I am currently overclocking a Cedar Mill 631 from 3.0 stock to 3.6 Ghz
How will I need to deal with the Pci Express Frequency setting

thank you
have a great day
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post #2 of 22
Just lock it to 100MHz. If for some reason your system starts to not display video, raise your PCI-E bus by 1 or 2 MHz and it should come right back.
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post #3 of 22
Thread Starter 
Quote:
Originally Posted by Chim3ra
Just lock it to 100MHz. If for some reason your system starts to not display video, raise your PCI-E bus by 1 or 2 MHz and it should come right back.
May I ask why you so confidently recommend that value? Don't you need to know my Card scematics? It's an ATI X1600Pro (12 pipes) 128 mb bus 128 mb size card. What does the 90 to 150 frequency actually mean , or indicate
this is still new to me , sorry

thanks for helping
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post #4 of 22
No, the card itself is unimportant in this situation because we are dealing with a frequency on your motherboard. The nominal setting for the PCI-E bus is 100MHz.

The 90-150MHz on the PCI-E setting just means you can adjust it anywhere along that spectrum. The best frequency to have it at is 100MHz since that is what it's designed to run at. There are others who have tested raising the bus frequency higher but garnered no gains in performance. I have mine raised to 115MHz just due to the fact my card will not display video at anything lower with my current FSB.
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post #5 of 22
Thread Starter 
Great advise from a Great Man,

I hope to be communicating more with you (^_^)

thanks for the advise

will get back to you if it doesn't hold at 100mhz...
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post #6 of 22
Like I said, if the video doesn't display when you power up after you have overclocked a little bit turn up the PCI-E bus frequency up 1 or 2 notches. I don't know if ASUS has any type of monitor for your PCI-E bus as a built in utility as the uGuru software does, but there is an easier way for you to tweak it. Leave the PCI-E bus on auto and overclock to your max while maintaining stability. Next, once you've reached your max overclock, open up your motherboards monitoring software (as I've said I'm not sure if ASUS comes with one or not or even the overclocking software that comes with it) and if you can determine the PCI-E bus frequency go back into your BIOS and try booting the rig 1 or 2 notches of what you identified in the software. If you get no video leave it at the original frequency (the one you got off the software).

I know it's a little confusing but once I get back to my place after my class tonight I'll take a screenshot of what I'm talking about. That is the way I did it so I could keep my PCI-E bus as low as possible.
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post #7 of 22
100mhz is the DEFUALT value for all PCI-e cards, its HIGHLY Recommended to lock it at 100mhz. Otherwise u r harming it .
yeah yeah...
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yeah yeah...
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post #8 of 22
That really hasn't been proven. Unless you can show me some figures and data that supports that statement I doubt it to be even true. I've had mine at 115MHz for the past 5 months with no adverse effects. It's completely stable and I don't have any issues that I've seen in that time frame.
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Elite
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post #9 of 22
It is not gonna DEFINATTLY kill your card, but it is highly recommended that you lock it at 100mhz, raising it just to gain performance will probley end up killing your card. It's like putting achohal in a gas only car to try and get more hp out of it, it just will ruin the car, unless of course it was made for it.
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post #10 of 22
I'm not sure if ASUS has a program like this but this is how I tweaked my PCI-E bus after I found my stable overclock. I just took whatever number the software I had was reporting and lowered it by 1 and tried to reboot. If I got video than I dropped it one more. Once it stops displaying video I just reset the rig and it held the last good frequency and I was all set.
Elite
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Elite
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