Radeon HD 6670 differences

Hello!

Ive been looking to build a light gaming computer and the hardest thing to decide on for me has been the gpu. Im pretty new to this so ive been doing a lot of research but i havent been able to find out how much of a difference different manufacturers building a card with the same engine really makes. I found a bunch of cards with the Radeon HD 6670 chip in them and seem to have a pretty wide price range.

So here is my question: How much of a preformance difference is there between these three cards and is it proportional to the price?

XFX HD-677X-ZNFC Radeon HD 6770 1GB 128-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150560&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=3938566&SID

GIGABYTE GV-R667D3-1GI Radeon HD 6670 1GB 128-bit DDR3 PCI Express 2.1 x16 HDCP Ready Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125403

SAPPHIRE Radeon HD 6670 1GB 128-bit DDR3 PCI Express 2.1 x16 HDCP Ready Video Card (11192-22-20G)
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102988

Thank you very much,
Griff
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More about radeon 6670 differences
  1. The first one you listed is a 6770 not 6670 and the 6770 is better, and at that price you can get a 7770 wich is very similar but i think it's better, dont know for how much.

    http://www.newegg.com/Product/Product.aspx?Item=N82E16814131477

    This is a card hierarchy chart classified by performance.
    http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107-7.html

    The XFX, Gigabyte and Sapphire brands make slight modifications (most of the time i think) to the same card like in this case the 6670.
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