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Confused: Raising FSB increases processor speed, but multiplier doesn't?

post #1 of 32
Thread Starter 
Hey all - doing a new OC on a new rig with the specs showing below...

First, I slowed the RAM down, decreased my multiplier and increased my FSB till I found my stable max FSB.

I was then going to try to find my RAM's max FSB, but as far as I can tell, there's nowhere in my BIOS to change the CPU/memory ratio, or memory voltage. Because of that I skipped the RAM and left the stock timings the same as well.

So, after that, I planned on going straight for the best FSB/multiplier combo... I lowered the FSB down 40mhz, and started raising the multiplier past the stock 10x... The BIOS flashscreen, nor Windows (XP Pro x64) never registered a raise in mhz.

At this point, the multiplier was at 15x - with no raise in CPU ghz at all, with FSB at 205mhz. Leaving the multiplier at 15x, I then raised the FSB back up to 245mhz (the max I had reached earlier). Rebooted - didn't post. I changed the multiplier to 10x (back to stock multi), left FSB at 245...

Stock CPU ghz was 2ghz, now, with no changes except to FSB, I'm getting 2.45 ghz.. with FSB at 245mhz and multi at stock 10x.

What am I missing here? Why won't the multi affect the processor speed?

Thanks all for any info.

Edit: Typos
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post #2 of 32
you need to save and exit the changes and re-enter the BIOS flashscreen in order for the processor speed to come up correctly
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post #3 of 32
Thread Starter 
Hmm? I am saving and exiting. When I do, it reboots with the changes.

That's not the problem. Like I said, I do see an increase in CPU speed. But, it's only when I increase the FSB. When I raise the multi - nothing increases.
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post #4 of 32
On that cpu the miulti is locked ..Only on the FX serires are the multi,s ulocked it may let you up it in the bios but it will default to standard every time ...Use the fsb to oc the chip
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post #5 of 32
Thread Starter 
Was it intended to be like that? What would be the reason for not allowing a multi increase? If I find my stable max FSB, is it the same as finding the stable max multi in my case?
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post #6 of 32
Thread Starter 
Can anyone chime in on my last post? Why do I have to use the FSB to increase the speed, rather than just raise the multiplier? And, why can't I raise the multiplier to begin with?
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post #7 of 32
You can't raise the multiplier because it is locked at 10. A 4200+ Manchester is just a 3800+ X2 with a 11x multi instead of a 10. They also unlock the multiplier on the FX chips to make them more "special".
post #8 of 32
The Multi is loocked at 10x even if the bios gives you the option to change it it wont change it becuse it's locked you can only change it down not up 10x is the highest multi you are gonna get to use with the 3800+
post #9 of 32
Thread Starter 
So, to confirm, they're designed to be OC'd only by raising the FSB?
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post #10 of 32
Quote:
Originally Posted by Noachian
Can anyone chime in on my last post? Why do I have to use the FSB to increase the speed, rather than just raise the multiplier? And, why can't I raise the multiplier to begin with?

Check the ASRock website for BIO updates.

I do not have any experience with ASRock, but most of the Asus MoBo's that I have used have an updated BIOS that allows the user to change Multi. Perhaps ASRock is similar...

Good luck!

P.S. - Check out V1.2 on the following page:
http://www.asrock.com/support/downlo...Dual-VSTA#bios
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