What is the difference between these two rams?

What is the difference between these two rams?
Corsair Vengeance CMZ8GX3M2A1600C9 8GB (2x4GB) DDR3
Corsair Vengeance CMZ8GX3M2A1600C9R 8GB (2x4GB) DDR3
Also what are some affordable 2x4gb ram for gaming?
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More about difference rams
  1. The 2nd ones red, thats all.
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