so does that nullify 480s "advantage"?
Probably off topic for this thread. However, the RX580 can likely be undervolted also, although it's clocks are likely pushed far past the efficient range of the frequency/voltage curve. The RX580 really isn't anything more than an OC'd RX480 but you might get higher clocks with slightly less voltage due to process improvements. As I mentioned, it looks like the RX480 in the TPU article needs 1.225V to hit 1411MHz. The Powercolor RX580 in anandtech's review
needed 1.205V to hit 1380MHz but that's without voltage tweaking. I'd bet you could run 1400MHz on an RX580 at less than 1.2V by, as Chrispy put it nicely, "spending ten minutes playing with the voltages in Wattman". My RX480 does 1305MHz happily at 1.03V FWIW. Keep in mind you're playing the silicon lottery in all cases, so YMMV.
I'd recommend taking pricing into consideration for your decision. I've seen higher end 8GB RX480s (better than this one
) for $190 or less (after MIR) and they're "old news" now that the RX580 has launched, so the RX480 may see further discounts to clear stock. Keep that in mind when you're looking at RX580 pricing and the ~5% performance improvement associated with it.
PS, before the RX580 launch I lobbied TR to do some investigation into the RX480 vs RX580 frequency/voltage relationships using manual voltage adjustments. That's still something that nobody else has really exclusively covered and it would've given TR quite a bit of publicity. Instead, we have to go elsewhere to see the important aspects of this launch. /vent
Main: i5-3570K, ASRock Z77 Pro4-M, MSI RX480 8G, 500GB Crucial BX100, 2 TB Samsung EcoGreen F4, 16GB 1600MHz G.Skill @1.25V, EVGA 550-G2, Silverstone PS07B
HTPC: A8-5600K, MSI FM2-A75IA-E53, 4TB Seagate SSHD, 8GB 1866MHz G.Skill, Crosley D-25 Case Mod