Barette mémoire???

Salut a tous,

je voudrais rajouter de la mémoire vive dans mon pc, mais je n´y comprends pas grand chose...
est- ce que quelqu´un pourrait eclairer ma lanterne...
voici la fiche technique de mon p.c :

A7N8X-VM specifications summary

CPU Socket A for AMD AthlonTM / AthlonTM XP 3200+ or above
400 MHz FSB Support
Chipset Northbridge: NVIDEA nFORCE2 IGP
Southbridge: NVIDEA nFORCE2 MCP
Front Side Bus (FSB) 400/333/266 MHz
Memory 2 x 184-pin DDR DIMM Sockets
Max. 2 GB unbuffered PC2700/2100 non-ECC DDR RAM
memory
Expansion slots 3 x PCI
1 x AGP 8X (1.5V only)
IDE 2 x UltraDMA 133/100/66/33
Audio (optional) RealTek ALC650 6-channel audio CODEC linked w/ South
Bridge
LAN (optional) 1Port
Realtek 8201BL PHY
Special features ASUS C.O.P. (CPU Overheating Protection)
Supports S/PDIF in/out
Back panel I/O Ports 1 x Parallel
1 x Serial
1 x PS/2 keyboard
1 x PS/2 mouse
1 x RJ-45 port
1 x Audio I/O
1 x VGA port
2 x USB 2.0
Internal I/O
Connectors
2 x USB 1.1 connectors support 4 additional USB2.0 ports
CPU/Chassis fan connectors
20-pin ATX power connector
PANEL connector
CD / AUX
S/PDIF in/out connector
TV out connector
Front panel audio connector (optional)
BIOS features 4Mb Flash ROM, ACPI 2.0, AMI BIOS, TCAV, PnP, DMI2.0,
DMI, Green, SMBIOS 2.3
Industry standard PCI 2.2, USB 1.1/2.0
Manageability DMI 2.0, WOL, WOR, WO_USB, WO_KB/MS, SM Bus
Form Factor Micro-ATX form factor: 9.6 in x 8.6 in (24.5 cm x 21.9 cm)

Que d´information en + c t´en anglais!
tous ce que je sais c´que j´ai 2x 256mb de mémoire et je voudrais passer a 1024mb mais? ...
merci pour votre aide :p