5570 gddr3 in crossfire vs single 5770

hi guys,
if i use a single 5770 gddr5 is better for me or if i use two 5570's gddr3 in crossfire is better?
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More about 5570 gddr3 crossfire single 5770
  1. One 5770 is enough.
  2. This depends on your resolution. Plus make sure your PSU and Motherboard can even handle CF'ed 5570s
  3. A 5570 is half of a 5770 in everything except for the memory interface, and is clocked slower, since CF only has about 80% scaling you will get quite a bit better performance from a single 5770 than from 2 5570s. In general a single faster card is better than two slower card to start with, as it lets you add a second on in the future to boost performance down the line.
  4. A single powerful card is better, so go with HD5770...
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