While at first glance, it may be in your best interest to shop around. Know that when you purchase RAM from MemoryMasters, you're getting Grade-A brand name computer memory. Trust when you buy from MemoryMasters, you are getting top of the line product from a top of the line company. We test every module before it leaves the building. PC2-5300 (667MHz) DDR2 240 Pin Server Memory Upgrade Registered ECC 1.8V