Kingston DDR2 PC2-6000 (750MHz) Memory
 

The KHX6000D2K2 kit is a matched pair dual channel 512MB DDR2 750MHz PC2-6000 modules. These modules are rated at 4-4-4-12 timings with 1.9 Volts. Not the lowest latency on the market today by any means, but still considered low latency for DDR2 memory at 750MHz.

Link: http://www.legitreviews.com/article.php?aid=193