What advantage is gained from higher FSB?

[Polish3d]

Going from 5xHTT x 220 to

5x HTT to 243, ram is the same at the 9 divider, cpu is the same at the 10 mult


Seemingly it is a ~10% overclock but my Sandra, PC Mark 05 scores remained identical. I expected a small boost at least.


I'm wondering where the benefit is seen from the faster FSB, or if there even is one when HTT is lower and, CPU and Ram speed remain the same

 

[mrkun]

There is no benefit from increasing the FSB speed besides the overclocking of the CPU and RAM (to my knowledge).

 

[BigCoolJesus]

Originally posted by: mrkun
There is no benefit from increasing the FSB speed besides the overclocking of the CPU and RAM (to my knowledge).

agreed

 

[Hacp]

Very little benefit. Look at this article to see what more FSB gives.
http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2469

 

[Link19]

Originally posted by: mrkun
There is no benefit from increasing the FSB speed besides the overclocking of the CPU and RAM (to my knowledge).

Why wouldn't there be?? A faster FSB would mean data can get to the CPU faster?? SO wouldn't that increase performance in addition to the internal CPU speed overclocked?

 

[BigCoolJesus]

Originally posted by: Link19

Originally posted by: mrkun
There is no benefit from increasing the FSB speed besides the overclocking of the CPU and RAM (to my knowledge).

Why wouldn't there be?? A faster FSB would mean data can get to the CPU faster?? SO wouldn't that increase performance in addition to the internal CPU speed overclocked?

yea, but the RAM and CPU are both still running at stock speeds (hes using dividers) so they cant take advantage of the increase in speed............

 

[Link19]

Originally posted by: BigCoolJesus

Originally posted by: Link19

Originally posted by: mrkun
There is no benefit from increasing the FSB speed besides the overclocking of the CPU and RAM (to my knowledge).

Why wouldn't there be?? A faster FSB would mean data can get to the CPU faster?? SO wouldn't that increase performance in addition to the internal CPU speed overclocked?

yea, but the RAM and CPU are both still running at stock speeds (hes using dividers) so they cant take advantage of the increase in speed............

But what about on a Pentium 4 system where you put in faster RAM capable of running at the same speed as the overclocked FSB so they still run synchronously at the same 1:1 ratio?? Wouldn't there be a good performance boost in thaqt case?? It seems to have made a big difference in 3-D Mark 2005 for my P4 system.

 

[Link19]

Oh I see. That's because he's using dividers, and why increasing FSB won't improve performance very much. But it will improce performance if the RAM is running at the overclocked speed synchronously with the FSB right?

 

[Leros]

Also, if you are bottlenecking at your video card, OCing your other componentes wont help your scores.

 

[Crescent13]

Originally posted by: Link19
Oh I see. That's because he's using dividers, and why increasing FSB won't improve performance very much. But it will improce performance if the RAM is running at the overclocked speed synchronously with the FSB right?

Excatly. You will notice even more of a performance improvement if you raise the CPU speed too.

 

[Matt2]

how did you raise the HTT without changing the CPU and RAM clock speeds when using the same divider and multiplier?

Also, raising the FSB helps on P4 systems and older Athlon XP and older systems because you are increasing the rate of communication between the CPU and the northbridge via the FSB.

A64s have onboard memory controllers effectively eliminating the FSB, hence the reason it is called HTT now.

 

[Polish3d]

It could have been clearer, I meant "I made ram the same as at 220fsb using the x divider, and cpu the same using the x multi"

 

[thegimp03]

So what? Your processor is already fast enough. Wah.

 

[Fox5]

Originally posted by: mrkun
There is no benefit from increasing the FSB speed besides the overclocking of the CPU and RAM (to my knowledge).

Higher FSB along with higher memory means higher bandwidth and lower latency. Going from stock to ultra high performance memory can be up to around a 25% difference.

Higher FSB alone doesn't have any benefit beyond just increasing the cpu speed, and sometimes a slight latency penalty from running it out of sync with the memory.

I don't think the bandwidth of higher fsb/memory matters much, but the lower latency does.(assuming you can raise ram speeds without loosening timings, if you have to loosen the timings to reach the higher speeds then there's like a net nill benefit)