that's a waste of time.
a simple example.
you have an old GCN 1.0 like a r9 270 with about 2.5 Gflop and compare it to a new GCN 2.0 RX 480 with 6 Gflops than the RX 480 is at least double as fast as the r9 270 but with NGU that not the case because of drivers or/and other stuff.
so a bigger card in the same series is generally faster for madVR and a bigger card is usually faster in everything.
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