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What is the motherbaord you are using?<br />
<br />
some mothrebaords will have 2 seperate memory banks like this<br />
<a href="http://www.newegg.com/app/Showimage.asp?style=album" rel="ugc">http://www.newegg.com/app/Showimage.asp?style=album</a><br />
<br />
and by putting in 2 512 sticks 1 in each bank will be faster than putting a single 1gb stick in the first bank.<br />
<br />
what you are looking for in terms of memeory is the bus speed eg 2100 2700 3200 and the cas latency where less is more...<br />
<br />
<a href="http://www.newegg.com/app/ViewProduct.asp?submit=property&DEPA=0" rel="ugc">http://www.newegg.com/app/ViewProduct.asp?submit=property&DEPA=0</a>
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What is the motherbaord you are using?

some mothrebaords will have 2 seperate memory banks like this
http://www.newegg.com/app/Showimage.asp?style=album [http://www.newegg.com/app/Showimage.asp?style=album]

and by putting in 2 512 sticks 1 in each bank will be faster than putting a single 1gb stick in the first bank.

what you are looking for in terms of memeory is the bus speed eg 2100 2700 3200 and the cas latency where less is more...

http://www.newegg.com/app/ViewProduct.asp?submit=property&DEPA=0 [http://www.newegg.com/app/ViewProduct.asp?submit=property&DEPA=0]

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Your motherboard likely support Dual Channel DDR RAM - but to use this, you must have two identically chips in the slots. &nbsp;2x512 for 1GB or 2x1GB for 2GB. &nbsp;Then as katacombz says, you want a high &quot;hundred&quot; number (2100, 2700, 3200, etc) and a lower CAS number - but most of the time, CAS is 2.5. &nbsp;
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Your motherboard likely support Dual Channel DDR RAM - but to use this, you must have two identically chips in the slots.  2x512 for 1GB or 2x1GB for 2GB.  Then as katacombz says, you want a high "hundred" number (2100, 2700, 3200, etc) and a lower CAS number - but most of the time, CAS is 2.5.  

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I don't find any clue on the Net about which memory configuration would provide<br />
the fastest and most stable way to run multiple applications at the same time :<br />
a very fast 1Gb like Corsair Twinx 370O/4000<br />
or a big 2Gb like Corsair Twinx 2048-3200 Pro ?<br />
My system : P4 Northwood 3.4ghz, Xp Pro, 2x 74Gb Raptor + 1x maxtor 300Gb SATA
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I don't find any clue on the Net about which memory configuration would provide
the fastest and most stable way to run multiple applications at the same time :
a very fast 1Gb like Corsair Twinx 370O/4000
or a big 2Gb like Corsair Twinx 2048-3200 Pro ?
My system : P4 Northwood 3.4ghz, Xp Pro, 2x 74Gb Raptor + 1x maxtor 300Gb SATA

Which memory is best for running multiple applications (hyperthreading) ?

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