Kingston ValueRAM 256MB PC2100 ECC DDR-SDRAM

This DDR PC2100 ECC 184 pin DIMM has a memory bus width is 64 bits, or 8 bytes wide, with 266MHz of data rate. The peak bandwidth at 2.1 GB/Second. The ECC module uses an extra onboard chip which can provide correction for single bit errors, but at the cost of running slightly slower than non-ECC module memory.