I have my completely custom mod for the rom. (I have it for MSI 4G RX480). I checked that MSI and your asus mod have exact same timings on the original roms) so the modified roms should work fine.

As far as power goes; my current rig with 6 MSI RX480 4G gaming x on 1000W PSU so you should be perfectly fine. My current hashrate is 174MH/s ETH (avg 29MH/card) with dual mining Siacoin 390MH/s

Here is the proof. Look at my last rig. named 113. Other 2 rigs are reference cards. All are RX480s 8 gb. Currently my rig is running 56hrs straight (as you can see on the 2nd column and error rate is wayyyy lower (0.1% wrong shares) than my reference cards running on modified Boysie 29MH rom (0.3% wrong shares).



As far as power goes
Each card on dual mining using 110W on GPUz. Single mining uses 90-95W. So at wall both should be around 130 for single mining, 160W for dual mining max.


How much can you send me for the mod? I am not a big miner but it took me a lot of time to find the right combination of the variables on these cards so charging something for it. Let me know if you are interested