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Does anyone have a experience running the XFX R9 295 X2? SOLs/settings/temps/watts/...

560 Sols total, 1100 core, 1500 mem, 72C and 68C temps, no idea about power, probably around 450W.

With those settings and default voltage it is more like 560w at the wall. It starts throttling at 75C, sometimes earlier depending on power limit.

Mine are in custom loop except one 'reference' model. It has default sapphire oc bios with 1030/1300, running it right now undervolted&clocked 886/1250 470s/s 360w at the wall. Voltage is 0.97V with AB -100mV, could be more efficient but needs more bios modding on that dpm2-5 area, been too lazy for that so far.

EDIT: 58 and 55C, ambient 27C.

What are the implications in the comparison of efficiency/functionality of the two Rigs:

A) 2 xfx R9 295X2 = ~$900 = ~1000W = 1120 SOLs

B) 6 RX 470s = ~$1100 = ~880W = 1120 SOLs

I think all of my presumptions are right. Is the xfx R9 295X2 similarly capable of mining ETH at the same ratio to the RX 470?

My guess is, if you have free or very cheap electricity, the 295x2 is a viable option. It hashes around 60MH on ETH with the right settings. Another advantage of water cooling is lower noise levels, compared to 6 card rigs.

Otherwise, it's pretty hard to beat a 470 with a low power bios mod in terms of efficiency, unless you somehow manage to get some R9 nano with Eliovp/Heliox low power rom.

My third choice would be 2 Pro Duos Grin

But those are crazy expensive and would take years to ROI.

I can run the R9 390 with 0.98V and 950 MHz, having a hash rate about 250 and 160W at the wall. 295 should be better than that if undervolted as it uses better quality chips.

UPDATE

What are the implications in the comparison of efficiency/functionality of the following Rigs:

A) 2 xfx R9 295X2 = ~$900 = ~1000W = 1120 SOLs ZEC, 120MHs ETH

B) 6 RX 470s = ~$1100 = ~880W = 1120 SOLs ZEC, 164MHs ETH

C) 5 R9 390 = ~$1200 = ~800W = 1250 SOLs ZEC, ____MHs ETH

I think all of details / presumptions are correct. This would lead me to believe, as it stands, that C would be the most efficient option...correct?