Below is a link from a cruical memory scan: http://www.crucial.com/systemscanner/viewscanbyid.aspx?id=5A76EB6731D926C3 Each memory slot can hold DDR2 PC2-4200,DDR2 PC2-5300,DDR2 PC2-6400 with a maximum of 1GB per slot.* I have 2 sticks of DDR PC2-5200 installed yet it isn't listed above as compatible? How much of a benefit would adding 1GB stick of PC2-6400 so my system would run at 6400 instead of 5200? 10% at best? I bought two more sticks of the 6400 so I could add both for 4GB but since XP will only see 3GB is there any reason to go with 4GB instead of 3GB? If I only put 1 pc-6400 GB stick in I'll have a 1GB pc-6400 just sitting around:) Here is the memory I bought, good cheap stuff but it's the fastest my system will see. http://www.tigerdirect.com/applications/searchtools/item-Details.asp?EdpNo=1558870&sku=C19-4332&CMP=EMC-TIGEREMAIL&SRCCODE=WEM1610V Thanks, I'm out and have a great weekend all. Rudy --------------------------------------------------------------- Please remember to trim your replies (including this sentence and everything below it) and adjust the subject line as necessary. To unsubscribe or change your email settings: //www.freelists.org/webpage/pctechtalk To access our Archives: http://groups.yahoo.com/group/PCTechTalk/messages/ //www.freelists.org/archives/pctechtalk/ To contact only the PCTT Mod Squad, write to: pctechtalk-moderators@xxxxxxxxxxxxx ---------------------------------------------------------------