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Processor bus speed vs front side bus speed

Posted on 2004-09-22
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Can I install a P4 processor with 800 Mhz bus into a computer currently running a P4 processor with 533 Mhz bus speed?
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Question by:bradsoblesky
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Callandor earned 500 total points
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You could, but that would be a waste of a lot of cpu speed: you would be running at 133/200 = 66% of full speed.  That is called severe underclocking.  If you're doing it just to use the cpu until you can buy a faster motherboard, it's not going to be any faster than a 533 bus cpu.  Of course, you could try bumping up the FSB a little, if your motherboard lets you, but I'm guessing you're running it at 533 because it won't let you.  When you do get a faster motherboard, don't forget to get faster RAM: PC3200, at least.
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by:buckeyes33
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What motherboard do you have?   It would be better as Callandor has stated to run at full speed, but that really depends on your motherboard will or not.  So tell use your motherboard and we will tell you whether or not it can run at 800mhz otherwise it would be a big waste as already stated.
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by:zubin_kharas
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Hey folks,

  I guess, P4s are not compatible between 533 & 800MHz buses. When P4s were first introduced, I had tried running a 1.7GHz CPU in the mobo of a 1.2GHz & couldnt do it. I wonder if 66% of underclocking is supported by FCPga2 sockets
  Another issue is also that the 800MHz COU may have HT support & disabling that is possible at 800MHz FSB but it may not be possible at 533MHz as I think 533MHz CPUs & mobos do not support HT at all.
  I think the best option would be to get a mobo & PC3200 or prefereable maybe DDR400+

Regards,
Zubin
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by:Godxilla2001
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Simple buy a MB that supports your processor as stated above and get the matching memory as well. You almost have to rebuild the machine to accomidate the processor.
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