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7*500 or 9*389--what's the difference?

361 Views 9 Replies 9 Participants Last post by  CL3P20, 
The Argosy
What role does the FSB-Frequency ratio play in terms of actual processor frequency attained; in other words, why do the Anand guys go for such a low multiplier/high FSB?:

http://www.anandtech.com/cpuchipsets...spx?i=2851&p=3

Thanks to whoever answers.
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Fishie36
You would want lower FSB if your ram can't handle it. You would want higher FSB if it can.
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tubnotub1
This one is actually rather easy. When you up the mutliplier of CPU you are only overclocking the CPU, the FSB is staying the same which means you memory is also staying the same. When you lower the multi and up the FSB you are not only increasing the frequency of the CPU, but you are also increasing the frequency of the ram (overclocking it) which leads to increased speed. Which is why its always more effective to have a small multi, high fsb over a high multi, small fsb.
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mudd
if you have good ram you want to run 500 x 7 because that'll effectively push your FSB up to 1000+. if you have less quality ram you want to use the higher multi. it just helps adjust your system to max performance.
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Lt.JD
Higher FSB means that your memory is running faster and your CPU is running over stock. You want higher FSB because your memory is running faster and so is your FSB which means that memory and proccessor can talk to each other quicker. So you want higher FSB lower multi rather than higher multi Lower FSB
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adam144
Definitely go with the higher FSB. Basically it means your whole system is communicating faster
.. well the CPU and RAM anyway
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Fishie36
"Go with the higher FSB always no exceptions" is only good advice if you spent a boatload on overpricegouged ram. For the rest of us, sometimes it's better to run low FSB and high multi to obtain the max cpu speed possible without getting ram instability.
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M
i guess u can say that this is why lower grade cpu + big overclock > higher trade cup + low overclock
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Jazino
Quote:


Originally Posted by Fishie36
View Post

"Go with the higher FSB always no exceptions" is only good advice if you spent a boatload on overpricegouged ram. For the rest of us, sometimes it's better to run low FSB and high multi to obtain the max cpu speed possible without getting ram instability.


agreed, not everyone has $300 ram. using multipliers shouldnt be frowned upon so much, or lower fsb with higher multi.
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CL3P20
Higher FSB allows more bandwidth to the entire system. Allowing you NB to reach extreme speeds can increase your RAM->CPU throughput.
**Your numbers on a P5B should =......
389mhz FSB * 9x multi should yeild a 380ish mhz NB, where as @ 500mhz FSB * 7x multi, your NB speed would be around 750mhz!

-Put it this [email protected] a 1:1 ratio using DDR 800, your NB would be at the base speed of your RAM, or 400mhz....can you imagine the Mbs if your RAM could keep a 1:1 @ 750mhz? It could be close to 16,000!
......Bottleneck what?
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