This Kingston Brand memory works very well in my Dell 670 precision workstation. The installation is a little tricky - I recommend laying the WS flat on firm surface so that you can use 2 hands to apply even pressure to get the cards to seat effectively. 4 Gb's really enhanced the performance of my SolidWorks software. Best price I could find on the net. Free shipping a plus! I received the package in 2 working days. Completely satisfied.