SiS 648 - DDR 333 or DDR 400?

nahKli

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Sep 7, 2002
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OK after reading THG's article about DDR400 Kills Rambus:
Shooting Star SiS 648 for P4(http://www.tomshardware.com/mainboard/02q3/020720/index.html)
I'm a little bit confused as to what the SiS 648 actually supports. In the review, Tom's says that the chipset supports DDR 400 memory, and yet I have been unable to find any references on motherboard manufacturers sites that say it supports anything above DDR 333. So what gives?

Will the Asus P4S8X board be able to handle, say Corsair DDR 400 with Cas2 or Cas 2.5?

The reason I'm asking is that the truth be told I would much prefer to purchase and run the faster memory, but I would hate to get stuck with the memory and it not work on the Asus P4S8X board.

Does it require over-clocking to run the DDR 400 memory? Or is it not officially supported, but the board can handle it?

Any help is appreciated. Thanks!


-Edit-
Another question: say if I bought the faster ram and I couldn't run it at DDR 400, would I be able to Under-clock it to DDR 333? and therebye still be able to use the memory? I just read this review(http://www.accelenation.com/?doc=162&page=2) and it shows that the 512MB Corsair XMS3000 was used both at 333 and 400 speeds. So would that be a safe medium to jump from 333-400? This test was run on SiS's reference board, so I'm hoping Asus' can perform as well.<P ID="edit"><FONT SIZE=-1><EM>Edited by nahKli on 09/09/02 10:23 AM.</EM></FONT></P>
 

JaeSun

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it supports it, just not officially ... if you want official support, wait for the SiS648DX which should support it .....

i think they waited to officially support it to wait for JEDEc to approve the official DDR400 support

_____________
100 Character Limit Sucks!!
 

Force3dfx

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I had the exact same questions, they should at least put something the technical specs. I was worried after I was doing some more research after I had ordered already!
 

Vric

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The Asus P4S8X could support DDR400 but it's not 100% garented... There is a lot of isues and DDR400 don't work for a lot of ppl.

And es you can underclock your memory
 

Lord_Berek

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Dont bother...

PC2100 is all you really need considering the bus and all.

the others will only offer little performance. If you have an unlimited wallet go for it, otherwise stick with the PC2100... thats my motto anyway.
 

Vric

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No sorry I didn't think like you

Pentium 4 NEED a lot of Memory Bandwitch.

Ok yes DDR400 is a bit useless, but Buy DDR333 not DDR266 !!

The price of the DDR333 is very close of the DDR266 and the P4 really need this extra bandwitch. (look at any benchmark)

So go for P4S8X and good DDR333 CL2 you will be happy
 

nahKli

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OK thanks for the replies.

I went ahead and ordered the board, just got everything setup tonight

Tried cranking up the memory Freq to 200 Mhz and it either locks the system up or it bogs down to almost a halt

Had 2-3 second delay scrolling from each menu/item in the bios

Specs:
Asus P4S8X
P4 Northwood 2.4 ghz - 533Mhz

Corsair XMS3200 Cas 2

so far no dice
have everything running on "auto" right now and 166Mhz works fine for the memory...just have trouble at 200
 

nlukin21

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Mine should come today. Specs are exactly the same....
Sucks that it will be only 166Mhz, should have gone for Rambus..:-(
 

GuyIncognito

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I had the same question. I've found that only a few DDR 400 memory modules have been validated with the SiS 648 chipset.

From <A HREF="http://www.sis.com/products/chipsets/oa/pentium4/648.htm" target="_new">http://www.sis.com/products/chipsets/oa/pentium4/648.htm</A>

I found that only one Kingston 256 MB DDR400 module at CL 2.5 , and 2 Samsung memory modules (one 128 MB DDR 400 module at CL 3.0, and the other 256 MB at CL 3.0) have been validated as of Aug 26.