Introduction Now that DDR2 is out, motherboard manufacturers have gotten geared up for it's appearance. Is now the time to go for the gusto and upgrade? Hopefully this article will help to shed some light on that question as we put the new against the old. On-Die Termination On-Die Termination is what it sounds like. With DDR, excess signal noise was eliminated by transistors built into the motherboard, but DDR2 has the terminating transistors built into each memory chip. Posted CAS and Additive Latency These two, prevent data collisions within the memory while still able to transfer more read/write instructions per clock cycle. Off Chip Driver Calibration Increases signal integrity Prefetch DDR uses a 2-bit prefetch while DDR2 now uses a 4-bit prefetch. Mfr Part Number KVR667D2N5/1G Type DDR 2 Data Bus 64Bits Capacity 1GB Speed PC5400 667MHz Size & Bit 128M x 64 Pin 240pin ECC No Registered No