It seems like every RAM company has at least one module based on TCCD. Although it is used by most companies as low latency DDR400, Mushkin rates this TCCD as high latency DDR550. This is nice because you are guaranteed a high FSB, but you can also tighten the timings if you don't mind lowering the FSB. Mushkin also has a low latency DDR400 TCCD based RAM in their product lineup, which is a little less expensive, but is not guaranteed to run higher speeds.