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How come 533 FSB to 800 FSB made P4 alot faster?

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November 18, 2003 11:27:46 PM

Kind of a newbie question. But I never quite understood how come 800 mhz FSB made so much difference compared to 533 mhz FSB. I don't think there were was too much difference from 400 to 533 bus with 133 mhz increase, but a 266 mhz FSB increase really improved performance. I would have anything too with cpu arhitecture or something?

533 mhz bus P4 clocked speed seemed to be even with Athlon XP's ratings performance, but those 800 FSB kills the same rating athlon xp. Any explanion would be helpful!

<P ID="edit"><FONT SIZE=-1><EM>Edited by unseen on 11/18/03 08:29 PM.</EM></FONT></P>
November 19, 2003 12:41:27 AM

To be honest 800MT FSB is really not that much IMO.
Even with PAT, 50% more bandwidth shouldn't have only yeilded about 10-15% more performance. I feel the chipsets were never worked on to their best. Once again, RDRAM at 6.4GB/sec would've likely kicked arse.

As for the 800MTs killing the AXPs, it's only logical if they're better than the 533MT ones no?

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November 19, 2003 3:39:05 AM

AMD revised their rating system late in the game to make it better for them and worse for you. The 3200+ would have been rated as a 2600+ on the original rating system I think. Also, Intel's DDR chipsets got better at the same time as the 800 bus was released.

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November 19, 2003 10:32:59 AM

Well, we're about to see - hopefully in the next few weeks - what a 9.6Gb/s RDRAM memory architecture is capable of... :evil: 

:evil:  <font color=red><b>M</b></font color=red>ephistopheles
November 19, 2003 3:25:33 PM

It does beg the question: Is the best i845, the PE 800, THAT worse than Springdale?
I mean, were there that many optimizations?

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November 19, 2003 6:59:08 PM

Any release date?
November 19, 2003 8:19:42 PM

R659 been annouce by the way rambus make some test a bit faster that I875.
they got some mice feature also

Rimm 3200/4200/4800 and on future chipset and future FSB Rimm 6400 yes 200 mghz ram cell on rambus.

Read ahead cache buffer a cache memory in the chipset that use prefetching on the extra bandwith to cache some data on the chipset to reduce latency at a lower level that I875 have.

Hyper stream look like a PAT also found in to be release DDR chipset from SIS.

My guess is the only chance to rambus to make a comeback will be on 1066 FSB were RDRAM and DDR-2 will run on the same ram cell at 133 mghz.There will be a premium price for DDR-2 should put it around the same price as RDRAM.We will see if intel have really unplug the Rambus or not as Elpidia is the 2 manufacturer of RDRAM after Samsung and Intel have invest a lot in Elpidia to update there process.Dont forget that intel still have a lot of rambus stock.<P ID="edit"><FONT SIZE=-1><EM>Edited by juin on 11/19/03 05:35 PM.</EM></FONT></P>
November 19, 2003 8:39:39 PM

Well to start with its NOT Mhz!

the real bus Mhz are 100 133 and 200, all quad pumped.
And Pentium 4's are known to thrive on high memory bandwidth. The more the merrier!
Take it away and all you end up with is...well... a celleron. *shudder*

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I know the way myself. :evil: 
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Mr no integrity coward.</b>
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November 19, 2003 9:44:09 PM

Look at how close these things are. If you have a CPU with a 5% advantage and a board with a 5% advantage, the 10% gain is enough to put you into an entirely different performance league!

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November 20, 2003 2:26:10 AM

I realize that, but relatively, it really isn't much to me. Those benchmark bars haven't grown much lately visually! :eek: 

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