I recommend going with the 1GB GDDR5 over the 2GB GDDR3/DDR3, the 1GB GDDR5 has more memory bandwidth and it's worth getting it, avoid the GDDR3/DDR3 versions.
It's in german, but it shows a clearly difference between the 2GB DDR3 and the 7750(1GB GDDR5) : http://ht4u.net/reviews/2012/msi_radeon_hd_7750_2gb_ddr...
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