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RAM and FSB speed question

S

Super Mario

Limp Gawd
Joined
Apr 22, 2003
Messages
466
Is it important for best system performance that the RAM MHz speed and FSB MHz speed match?
 
Yes. to a piont.. Your best performance will be achieved if the RAM speed is equal to or greater than the FSB speed.
 
So are Pentium 4 systems with an FSB of 533MHz underperforming because almost all P4 motherboards with a 533MHz FSB only support DDR-SDRAM up to PC2700 333MHz? All of the DDR-SDRAM is slower than the modern Pentium 4s FSB. With Athlon XP CPUs, it has been much easier to set a system up where the FSB speed matches the RAM speed. Does this mean that Athlon XP CPUs have been maxing out more performance than Pentium 4 CPUs, or does it not matter as much for the Pentium 4? Is it true that for the most modern Pentium 4s with 800MHz FSB that using DDR PC3200 400MHz RAM in dual channel configuration makes the RAM speed 800MHz to match the 800MHz FSB speed? I've heard the RAM speed doesn't double, but the throughput doubles with dual channel DDR400, making it effectively match the P4C FSB speed?
 
Hmm. Your not achieving greater performance when your RAM is running faster then your FSB. It can still TECHNICALY only communicate with your CPU at the FSB speed, which leads me to dissagree with you and say that your better off with a higher FSB speed, because then your using ALL of your RAMs speed/bandwidth, plus anything else feeding off the front side bus has plenty of speed to get itself where it needs to go. The only time that the idea of equal speeds applies is when your FSB is at a lower speed then your RAM. i.e. 333 FSB/400 RAM, once you hit 400/400 you see a great boost in performance, from there its all RAM, seeing as your FSB is faster than your RAM, so your it can take every once of speed from your RAM.
 
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