The 1st ones were rev 1.0G and the later ones rev 2.0G, this is my 2nd board...the 1st one I had was a rev 1.0 and sucked badly, and could not get pass 210 bclck with a variety of CPU's...my current one is a rev 1.0 as well and is great and does 255 blclk on the 980X. From what I can gather the rev 2.0 fixed a lot of issues the 1st one had especially with low bclck walls.
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