Well, PSU one died about 2 weeks ago and was hosting just 3 5830's
Psu 2 and 3 both died on different identical rigs (6x5830s, MSI890FXA-GD65, Semp140). Now from the wall, one psu runs at about 400-500w depending on if its the mobo psu or I have fans on it.
PSU 2 died in dual setup with a second same model psu that is still kicking fine. It wont power up, or do anything.
PSU 3 died somewhere around 9am pst this morning, after I looked at the rig at 8:40am. Everything was fine, then I came back in after a shower and same result as PSU 2.
Now the 12v is rated at max load of 675w and 65amps. So why this is happening, I have no clue. There are 8 psus in that rig, 2x890FXA-GD65 and 2x890FXA-70 with 6x5830s each. Each setup is 3 and 3 on each psu, with the fans (if they are not AC) are hooked into the non mobo psu. Each 2psu rig runs about 8amps. Each 2psu is also on its own circut with no more than 2amp draw anywhere else in the building.
Circuits are rated for 20amp trip.
PSU 2 and 3 died on the mobo btw, but no hardware damage to anything.
On a related note. Diablotec PSUs are even worse! I had bought a bunch of these at about $5 a pop. Out of 15, 2 are left and this wasnt even for mining rig, just standard desktop PSU replacement.