G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL for $93.99 at Newegg. It works with Dual Channel Intel Core i5 & Core i7 CPU for P55 motherboard.

Expire 1/31/10