RAM Kingston DDR3 8GB -1066MHz CL7 for Mac Pro

Hello, this is my first post here on board, so I would like to know if anybody has any expirience with RAM Kingston DDR3 8GB -1066MHz CL7 2x4GB kit. I have Mac Pro Intel Xeon "Nehalem" Quad core 2.66GHz and I would like to get more RAM for it. I have 6GB in three slots so I will remove one 2GB RAM module and use 2x4GB modules instead. Will this Kingston kit work flawlessly with my Mac pro? Thanks for any advice.

You need to buy RAM that has ECC in the specs:
Apple mac pro 2.66ghz quad-core xeon (mb871ll/a) Memory Upgrade - mac pro 2.66ghz quad-core xeon (mb871ll/a) RAM
Computer memory upgrades for Apple Mac Pro (4-core Xeon 3500 Series) 3rd Gen. Early 2009 Desktop/PC from Crucial.com
Mac Pro Memory

Thank you very much. I have three 2GB modules right now in my Mac pro. If I will remove one and replace it with 2x4GB will it work flawlessly. I would have then 2x2GB and 2x4GB. Is it OK?

(Answered privately, too)
Mac Pro: How to remove or install memory