The Corsair Xpert TWINXP1024-3200XL DDR Memory Kit measures approximately 2.15" (H) x 5.41" (L) x 0.80" (W) with a weight of 5 oz. The package consist of two 512MB memory modules which have been implemented using 32M x 8 DDR SDRAM chips. The TWINXP1024-3200XL designation of this particular package is suited to run on dual channel supported motherboards at DDR400 with a low latency setting of 2-2-2-5 and a voltage of 2.7V. The low latency setting refers to the CAS latency setting in your motherboard's BIOS. CAS stands for "Column Address Strobe" and is essentially a ratio generated between column access time and the clock cycle time of 2 cycles. The revised timings can be considered the most aggressive available and are designed to enhance memory bandwidth.