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800 FSB in a 400 FSB motherboard? - Page 2

post #11 of 17
Quote:
Originally Posted by Adeoliver
I think you guys missed the question in hand. He's simply asking if a 400mhz board will support a 800mhz CPU I.E. 3.0 prescott 1mbl2 800mhz buss speed. Well at least thats what I got.
I responded to the memory question as he's got a Williamette motherboard which is a socket 423. Any FSB over 400MHz will not make that board. He would not be able to access any voltage changes for the differential of the default voltage of 1.75V vs the default voltage of Northwood's 1.5V.

He would have to find a special socket 478 to socket 423 converter with voltage steppings and multiplier on the converter to allow him to access even the 400MHz Northwood 478's. The 800MHz Northwoods and Prescotts are completely out of the picture.

Of course I didn't answer that portion of his question because I had already answered this to him 10 hours ago here:

http://www.overclock.net/amd-cpus/79...er-aaannd.html

However, I will answer it again for your purposes

R
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post #12 of 17
Quote:
Originally Posted by Ropey
I responded to the memory question as he's got a Williamette motherboard which is a socket 423. Any FSB over 400MHz will not make that board. He would not be able to access any voltage changes for the differential of the default voltage of 1.75V vs the default voltage of Northwood's 1.5V.

He would have to find a special socket 478 to socket 423 converter with voltage steppings and multiplier on the converter to allow him to access even the 400MHz Northwood 478's. The 800MHz Northwoods and Prescotts are completely out of the picture.

Of course I didn't answer that portion of his question because I had already answered this to him 10 hours ago here:

http://www.overclock.net/amd-cpus/79...er-aaannd.html

However, I will answer it again for your purposes

R
Quote:
Originally Posted by ENTERPRISE1701
Yes this is what he is asking and i answered..simply a 400MHZ FSB BOARD will not work with an 800MHZ FSB CPU
Im sorry guys, it was realy late last night and I completely miss read your post's.
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post #13 of 17
It's all good

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post #14 of 17
Quote:
Originally Posted by Adeoliver
Im sorry guys, it was realy late last night and I completely miss read your post's.
No worries mate we all make mistakes especially when its late..Its the Human condition called being Tired
post #15 of 17
im kinda late but 400fsb board wont take anything higher, i know from experience. i had a 400bus willamete 18x100 = 1.8ghz. then i try to upgrade it with a northwood 533bus 18x133=2.4 the cpu work but it is downclock to 100bus which equal 100x18 and resulted in the same speed as my old processor except with more l2 cache. but if your board have option to raised fsb then u can prolly run it at rated speed.
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post #16 of 17
Thread Starter 
Quote:
Originally Posted by Nasgul
Welll, that first part you're correct, it all depends on the motherboard.

That motherboard will not support an 800mhz fsb CPU nor 533mhz fsb CPU but it will be able to use DDR400/333 and downgrade it to DDR266.

The SiS 650 chipset is very limited.


I'm sure they responded: Because your CPU's fsb of 400mhz the memory will be downgraded to PC2100.
They're usually pretty good, but all I got this time was a link to the supported processors page. Sort of a "Read the effin manual" reply on their part. Oh well. I was just curious.

Good to know although it doesn't apply to me anymore because I'm just not going to upgrade this system. yet. It's AMD for me pretty soon.
    
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post #17 of 17
Willamettes were never meant to run with DDR, it sucked and that's why performance was a little poor.

For Willamettes the best and obvious choice was RAMBUS. I had my 1.7 Willa with (4x128) 512MB PC-800 for a little over 3 years, to this date that thing is fast enough for almost anything (besides games).

But Willa + DDR = bad! and to make matters worse....Willa + PC-133, now that was a bad joke by Intel.
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