This ProMOS Technologies DDR1 SDRAM module has a total capacity of 256 MB and runs at a bus speed of PC-3200 (DDR-400). It is a single module that fits into a 184-pin slot and is non-ECC unbuffered with a CL3 latency. This memory module is perfect for upgrading your computer's performance. It is compatible with a variety of devices, including desktop computers, laptops, and workstations. Buy this quality product for a smooth and efficient computing experience.