Whats the differences between these cards?

setsudan

Honorable
Oct 27, 2013
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10,660
DDR5 is twice as fast as DDR3. If you look at the specs the R7 says : Memory Clock Speed(MHz 1800)
The Asus 7770 has a memory clock speed of 4600MHz with DDR5.
I would definitely look into the 7850 (msi twin frozr is a good deal usually). It is a lot better than the 7770 and pretty much in the same price range. Maybe even look into the 7870 if you find a good deal for it.