1500 watts (my self imposed limit, no reason i couldnt do more). its because i want the power efficiency and density that a fpga can give me. plus the versatility.
1.5 kw/h equivalent heat is already no small feat to dissipate... specially in mid range latitude in the summer
.thats one reason for my limit. currently my 7 card gpu rig draws 1100 watts and is in the basement. kept it nice down there last winter.
this year im going to get one of those grow tents with powered in and out vents to the basement windows and run it in that for summers.