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Increase FSB or CPU Multiplier

post #1 of 8
Thread Starter 
Having only just recently ventured into the confusing world of overclocking I’m still trying to understand some of the concepts of why different settings affect benchmark results.

When I run my system with 420MHz FSB and multiplier 9, which gives a CPU freq of 3780MHz, I get a better 3DMark score than when I set BIOS to 390MHz FSB and multiplier 10, which gives 3900MHz CPU freq. I assume this is because I’m being limited by the slower FSB.

My questions then:

1. Is it better to keep the multiplier at a lower setting and increase the FSB?
2. What effect does changing the multiplier have on the rest of the system?
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post #2 of 8
The only way to know the performance difference for every situation would be to test it (as you've done so far).

As for increasing the multiplier, all it does is increase the CPU speed by whatever the FSB is at (the original FSB not QDR or "rated" FSB).

Of course, you'll probably have to compensate for any increase in CPU or FSB speed with increased CPU Core and FSB voltages.

And yes, a higher FSB frequency will generally allow for better performance than a lower FSB frequency (all else being equal). But since it directly correlates to CPU speed, you just have to test it out and see what works best for you.
    
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by Choggs396 View Post
And yes, a higher FSB frequency will generally allow for better performance than a lower FSB frequency (all else being equal). But since it directly correlates to CPU speed, you just have to test it out and see what works best for you.
Thanks, + Rep

That's what I thought, I just needed someone with a bit of knowledge to confirm it for me. I think I'll go back to setting lower multi and higher FSB and keep tweaking until I get to where I want to be.
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post #4 of 8
Thread Starter 
OK, so I lowered the multi back to 9, set FSB to 430MHz and appear to be stable at these settings with a 3DMark score of 18702. So I ran 4 instances of Prime95 using the advice I found on the Hardware Analysis forum for stressing all four cores:

http://www.hardwareanalysis.com/content/topic/65100/

I Started to run 4 instances as suggested on the above link and I don't get any errors but after about 10 minuets one instance of Prime95 will randomly stop working. It's not always on the same core and as I say there are no errors reported, Vista just reports that the programme is not working and it closes, the other instances of Prime95 continue to run with no errors.

Does this mean that I don't actually have a stable system or is there something else wrong, maybe with Prime95 or my Vista setup?
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post #5 of 8
Generally speaking with intel guys you want a high fsb as this usually nets the best performance. The fastest fsb with the fastest ram and the fastest cpu will get you the fastest rig.

However you should test for your self to find out what is best.
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post #6 of 8
I do believe the reason you're seeing the higher FSB benching better, would be because your RAM is also at a higher speed. Your FSB not only clocks your processor, but your RAM as well. Hence the higher bench scores. Clock speed on your processor...doesn't matter if its reached by multi or FSB in my opinion. Just so long as you get it to its top speed achieveable. RAM speed is what's making the difference for you at this point.
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post #7 of 8
Quote:
Originally Posted by pioneerisloud View Post
I do believe the reason you're seeing the higher FSB benching better, would be because your RAM is also at a higher speed. Your FSB not only clocks your processor, but your RAM as well. Hence the higher bench scores. Clock speed on your processor...doesn't matter if its reached by multi or FSB in my opinion. Just so long as you get it to its top speed achieveable. RAM speed is what's making the difference for you at this point.
And with your AMD rig you would be right but with a intel rig your wrong for the most part.

When intel gets the onboard memory controller thats gonna make a huge differnece I assume and when they do the fsb wont matter any more. Itll be more memory timings and cpu speed.

Its in the way intel works witht he fsb and memory that gets you the better performance from higher fsb. With a lower fsb and equal cpu speed but with a huge increase in memory spped youll see a little jump in performance but nothing like increasing the fsb,
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post #8 of 8
Thread Starter 
Quote:
Originally Posted by sniffsunderclouds View Post
I Started to run 4 instances as suggested on the above link and I don't get any errors but after about 10 minuets one instance of Prime95 will randomly stop working. It's not always on the same core and as I say there are no errors reported, Vista just reports that the programme is not working and it closes, the other instances of Prime95 continue to run with no errors.

Does this mean that I don't actually have a stable system or is there something else wrong, maybe with Prime95 or my Vista setup?
Thanks for the feedback. So with an Intel CPU I'm better off keeping the FSB higher and not worrying too much about what multi I use.

At the moment I have my memory set at the lowest frequency possible within the BIOS until I get CPU to where I think is the best possible speed given the crappy cooling I'm using; I read that this was the best way to eliminate possible memory problems during the o/c process. I'll set the memory speed later.

Any clues though on my Prime95 problem above.
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Blue Dragon
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