How much average H/s can I get with using R9 290 cards?
I am considering buying r9 390, r9 290 or r9 290X.
Anyone here using these?
These cards use lots of power.
Expect 370h/s for 275w using R9 290x with 390x bios mod @ 1150/1350mhz +25-50mv.
290h/s-310h/s with stock/stilt bios @ 1000/1250mhs.
Unless you can get 390 really cheap, stick with R9 290x + R9 390 bios mod. You can get R9 290x down to 150w but hash rate will suffer. You need to use server power supplies for 290/290x/390/390x but you can get away with a single 1000w for 5x RX 470, 750w for brand name with perfect cooling.
At current prices your profit really depends on the price you pay for electricity. It's really hard to beat RX 470 efficiency with current power prices.
Everyone is expecting a pump before AMD releases VEGA, which is Q2 2017. You *might* break even R9 290x by then.
AMD is *speculating* VEGA being 2.5 faster than POLARIS, in other words 1000h/s for 250w.