Good REX2 has not these low BCLK wall.
I tesed 5 REX2, bad one faces BCLK wall under 210MHz, but good one over 235Mhz.
Mainly it depend on IOH quality, not mobo design.
But I think that REX3 average BCLK limit improve than REX2.
3D performance good same as REX2.
Anyway, I think UD7's average BCLK limit more better than REX3.
I bought 3 UD7(rev2) & these mobo BCLK limit are over 235MHz.
But UD7's memory performance is not good as REX3.
(3D performance is good as REX3.)
So you need consider what is more important for your OCing.
Only BCLK & 3D performance, I recommende UD7(rev2).
But you need memory & 3D perfprmance, I recommende REX3 or E760.
(Sorry, I had not test E770, yet.
so I do not know E770 is good mobo or not.)
I hope you will get good mobo.![]()





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