Hi folks, I have 4 banks in my computer for memory. While two of them are occupied already. They are two 512 sticks. With the other two banks left, would I have to use two more 512 or could they be of a larger size as long as both were the same? Here are some specs you may need: Motherboard Name Asus A8V Deluxe Front Side Bus Properties: Bus Type AMD Hammer Real Clock 200 MHz Effective Clock 200 MHz HyperTransport Clock 1000 MHz Memory Bus Properties: Bus Type Dual DDR SDRAM Bus Width 128-bit DRAM:FSB Ratio CPU/12 Real Clock 200 MHz (DDR) Effective Clock 401 MHz Bandwidth 6409 MB/s Chipset Bus Properties: Bus Type VIA V-Link Bus Width 8-bit Real Clock 67 MHz (ODR) Effective Clock 533 MHz Bandwidth 533 MB/s Motherboard Physical Info: CPU Sockets/Slots 1 Socket 939 Expansion Slots 5 PCI, 1 AGP RAM Slots 4 DDR DIMM Integrated Devices Audio, Gigabit LAN, IEEE-1394 Form Factor ATX Motherboard Size 240 mm x 300 mm Motherboard Chipset K8T800Pro Extra Features Asus Intelligence, JumperFree, Q-Fan 2, Stepless Freq Selection, Ultra-ATA/133, SATA, RAID Motherboard Manufacturer: Company Name ASUSTeK Computer Inc. Module Name Corsair CMX512-4400 Serial Number None Module Size 512 MB (2 ranks, 4 banks) Module Type Unbuffered Memory Type DDR SDRAM Memory Speed PC4400 (275 MHz) Module Width 64 bit Module Voltage SSTL 2.5 Error Detection Method None Refresh Rate Reduced (7.8 us), Self-Refresh Memory Timings: @ 277 MHz 3.0-5-5-10 (CL-RCD-RP-RAS) CPU Properties: CPU Type AMD Athlon 64 FX-53, 2400 MHz (12 x 200) CPU Alias ClawHammer S939 CPU Stepping SH-CG Instruction Set x86, x86-64, MMX, 3DNow!, SSE, SSE2 Original Clock 2400 MHz Min / Max CPU Multiplier 4x / 25x L1 Code Cache 64 KB (Parity) L1 Data Cache 64 KB (ECC) L2 Cache 1 MB (On-Die, ECC, Full-Speed) CPU Physical Info: Package Type 939 Pin uOPGA Package Size 4.00 cm x 4.00 cm Transistors 105.9 million Process Technology 9Mi, 0.13 um, CMOS, Cu, SOI Die Size 193 mm2 Core Voltage 1.500 - 1.550 V I/O Voltage 1.2 V + 2.5 V Maximum Power 89.0 W CPU Manufacturer: Company Name Advanced Micro Devices, Inc. Thank you for your in put.