Ddr2 Ram Pc-5300 Dual Channel 667mhz Question

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dont know the motherboard yet as i will not be getting the pc in the mail until friday, however my question is about Dual-Channel DDR2 RAM

my mobo will have 4 DIMMS capable of 1GB each for a total of 4GB
it will be stock with 2 512MB DUAL CHANNEL DDR2 PC5300 667MHZ sticks
can i add 2 more aftermarket 512MB DUAL CHANNEL DDR2 PC5300 667MHZ sticks and maintain DUAL CHANNEL performance, for a total of 2GB instead of 1GB?

if so do they have to be the same latency, if so how will i determine latency as this is a DELL XPS GEN 5 pre-assembled?

or would i be better off removing the 2 512MB original sticks, selling them on ebay, and putting 2 sets of brand new CORSAIR Memory 2 x 512 MB PC2-5300 DDR2 RAM DUAL CHANNEL MATCHED PAIRS???


DELL XPS GEN 5 (SEP 2005)
Pentium D830 (3.0GHZ),DCT
1GB DDR2 SDRAM AT 667MHZ-2X512MB
WIRELESS KYBD/ MOUSE
20 IN WIDESCREEN ULTRASHARP LCD
256MB PCIE X16 ATI RADEON X850 XT
RAID 0 W/ 2X250GB HARD DRIVES(STRIPE)
WIN XP PRO,SP2
48X CD-RW/ 16X DVD+/-RW
 
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