But why use 2 power supplies? Is there not enough power in the server power supply or is there no adapter to power the motherboard?
The 500-700w ATX unit is only good for 1-2 video cards, but the rig has 8-10 cards, so obviously more power is required. If I had a 10x RTX 3060 rig, it needs 2000w total. The ATX supply will cover 500w, so I need 1500w extra, which can be covered by two HP-DPS750RB supplies. Or I could have an 8-card rig and use a single HP-DPS1200FB supply. I like to have enough wattage to cover the full TDP of the cards.With 8x RTX 3080 Ti video cards (2800w) a single DPS1200 won't be enough. I will need two of them, with the remaining 400w being covered by the ATX unit.
Why not a 1600w ATX supply or even a 1200w one? Because they are double the price-per-watt of the server units. An EVGA 1600 P2 will cost $220 which is 13.8 cents/W. But a HP DPS-1200FB+breakout board+12v cables costs just $70 --> 5.8 cents/W.
Who makes chinese asics PSU?..asics are expensive and they rely on those PSUs, maybe there are good chinese PSU out there.
I do not build a mining farm with a consumption of 2-3 kilowatts. It is better to make 2 mining farms with a server power supply of 1200-1600 watts. Maybe it will be more expensive by $ 100, but it will be more reliable.
I have had no problems building mining rigs with two or even three power supplies. As long as the video cards are the exact same model and power sources are not mixed, the uptime has been close to 99%. I have had success with this method since 2017.A cheap power supply is not suitable for video cards. It can be used to power the motherboard and hard drive.
The EVGA 500GD is more than reliable enough with enough power for a single RTX 3080 Ti as well as the system components. It has 4.4 stars on Newegg. Why not make use of that capacity?
