Here is a are four 4GB G.Skill Ripjaws DDR3 desktop DIMMs, designed to handle memory transfer rates of 1600 MT/sec and beyond.  G.Skill made these 240-pin 1.5V memory modules with 8 CL9 chips on each side underneath metal heatspreaders that are about 30% taller than a standard profile DIMM.

Buyer will receive the exact four 4GB DIMMs pictured here.  I note that three of them are from a 4-DIMM Ripjaws X kit with part number F3-12800CL9Q-16GBXL, but the fourth is an older single Ripjaws with part number F3-12800CL9D-4GBRL

I offer a 30 day return privilege and free USPS Ground shipping to any U.S. zip code.