I am new to mining so though i would post some thoughts on the 2 rigs i have running at moment,first rig x4 Sapphire RX 480 nitro oc 8G down clocked by 25% with memory overclock to 2200MH/s fans on 80% and Temps 56oC not sure of power draw from wall as have no meter but GPU-Z shows max at around 120W each i will update later with real world power usage,running win 7 x64 and Crimson drivers 15.12 and with Claymore running only ether speeds are 27.390MH/s each GPU steady,i bought the nitro's as these will end up in my gaming rig when the time comes, The second rig has x4 XFX RX 480 GTR XXX 8g when installing same drivers as before resulted in driver errors so updated to latest release,memory overclock with wattman not possible here past 2050MH/s as memory locked so used alternative software to over clock memory to 2200MH/s both sets of cards run the same with 24.5MH/s on stock memory and 27.390MH/s with overclock at 2200MH/s different clock speeds on GPU make no difference within reason,i am not sure of heat from XFX cards as we are having a heat wave here in Scotland at moment so very hot and not fair to measure against nitro as they were running on there own under normal Scottish weather lol. Will run a comparison later when variables are the same for both sets of cards, different AMD drivers have not effected on my hash rate which is good to know but the latest Crimson drivers are buggy and crash often,how do they get away with it i don't know,a card is only as good as its drivers,come on AMD get it together!!! I hope this info helps and can be of some use,will update later with more info.
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