i thought that an hd radeon was the video card. i understand there are different bits gddr and memory sizes on each video card but what is the difference if the card says msi (module number) hd radeon 6670 or saphre ultimate hd radeon 6670 etc
Certain MSI cards are called "Power Edition" which feature Overvolting the GPU for higher overclocks. On the other hand, some Sapphire cards feature Vapor-X technology which will keep your GPU unbelievably cool than most other GPU's on the market.
You should also take a look at their Mail-in-Rebate program as well; some cards have a $20 mail-in-rebate making them a better value than other cards on the market