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P4 2.5s with 400MHZ FSB + 256kb cache?

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Last response: in CPUs
May 30, 2002 8:40:48 PM

I just did some price comparisons and to my surprise I found P4 2.5s under 500 bucks, RETAIL! Though in some descriptions at some merchants websites it stated that the P4 2.5 is only 400MHZ FSB and has only 256kb cache. That would explain the price drop but some descriptions are confusing and I didn't want contact the merchant if their descriptions are precise.

any help and answers from you guys?
thanks

More about : 400mhz fsb 256kb cache

May 30, 2002 9:14:15 PM

It could very well be a 400MHz version, but I can pretty much guarantee it isn't actually 256k L2.

<font color=blue>Hi mom!</font color=blue>
May 30, 2002 9:29:19 PM

I believe it won't be 256KB. But is a 400MHZ version of the P4 2.5s necessary...can't 400MHZ motherboards recognize a P4 with 533MHZ FSB? If 400MHZ motherboards can't recognize or use P4s with 533MHZ FSB then they should make P4 2.5s and up with 400MHZ FSB so ppl who have older mobos can upgrade to a higher clock speed
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a b à CPUs
May 31, 2002 3:20:19 AM

The motherboard you are trying to use does support the "533" bus speed, which should yeild around 10% better performance than the 400 bus speed at equal clocks. There is a 2.4 in both bus speed versions, for instance.

What's the frequency, Kenneth?
May 31, 2002 5:55:58 PM

No, my motherboard (BD7-RAID) supports up to 400MHZ only. The 533MHZ is the P4 2.5

anyway where did you find P4 2.5s with 400MHZ FSB?
a b à CPUs
May 31, 2002 10:47:50 PM

NO, it supports bus speeds of up to 250MHz in 1MHz increments. <A HREF="http://active-hardware.com/english/reviews/mainboard/bd..." target="_new">http://active-hardware.com/english/reviews/mainboard/bd...;/A>

The only processor available at both "533" and "400" is the 2.4. The corresponding bus speeds are 133 and 100.

Also check out the first paraghraph at this page: <A HREF="http://www.pchardware.ro/Reviews/review.php?id=157&p=5" target="_new">http://www.pchardware.ro/Reviews/review.php?id=157&p=5&...;/A> YOu could set the PCI ratio at 1/4, making PCI 33MHz at a bus speed of 133MHz, or even lock it at 33MHz separately.

So you could go with a "Northwood B", or "533 bus" CPU on that board quite easily, giving you a performance gain.

What's the frequency, Kenneth?
May 31, 2002 10:56:30 PM

Your motherboard does support the 533MHz bus, just download the updated BIOS that fixes the cold boot issue from ABit.

:wink: <b><i>"A penny saved is a penny earned!"</i></b> :wink:
June 1, 2002 4:27:51 PM

Quote:
If 400MHZ motherboards can't recognize or use P4s with 533MHZ FSB then they should make P4 2.5s and up with 400MHZ FSB so ppl who have older mobos can upgrade to a higher clock speed

Intel will be manufacturing P4s with 400MHz up to 2.6GHz I believe. They were going to release the P4 2.53GHz in Q3, but with AMD boring down on them they were able to het them out with the other 533FSB P4s. The 2.5GHz P4s with the 400MHz bus will still be launched in Q3.

My firewall tastes like burning. :eek: 
June 1, 2002 9:41:08 PM

thanks for the suggestions but it's not my PC so I don't want to do any tweakings as of yet...maybe on my next new PC...or maybe it's time to start doing my first tweakings. Whichever I choose thanks to you guys!
June 1, 2002 9:42:38 PM

yah..they ought to release 400MHZ of P4 2.5 and up...not everybody knows how to tweak and not everybody wants to change mobos...so it's either I wait for the 400MHZ versions or go tweak!