I'm going to use server psu's for the first time, and plan on buying this kit from Parallel Miner (https://www.parallelminer.com/product/1500-watt-2x750-gpu-mining-rig-power-supply/?attribute_62-pin-pcie-cables=%2B16+6%2B2pin+PCIE+cables&attribute_breakout-board=X11) but I have a few questions.

1. To run the two PSU's in parallel, do I just need to connect the two breakout boards using an interconnect cable?

2. Do I have to use separate power cables for each PSU, or can I use a power splitter cable?

3. Does the PSU in the link above automatically detect if its running on 110V or 220V?

4. Is 1500W enough to power 8 RX 570's or RX 580's and the motherboard, CPU, and SSD?

Sorry if these are dumb questions. I just want to be sure before I buy anything. Thanks.

My card is still under warranty, so I'd rather not try this.

I've tried this but it still isn't working.

So it looks like the card is powering up now. The LED light is on and the fans are spinning at full speed but the card is still not detected. Given this info, is there anything else I should try before RMA'ing?

I've tried connecting different risers to the card, connecting it directly into the PCI slot, change the PSU leads to the card, flipping the bios switch back and forth, but none of that has worked.

Did you ever figure out what caused this? Maybe in my case it had something to do with two of the same cards with different bioses being booted?

One thing I actually forgot to mention before was that the riser this card was connected to wasn't working (no lights flashing and the card wasn't detected in windows). Could a faulty riser somehow damage a GPU?

Looks like I'll be RMA'ing this card. First time I've ever had to RMA anything, and it's been quite a headache.

I didn't download a bios. I just used the one click timing patch on Polaris and then programmed the modded bios using atiwinflash.

This is what I'm thinking as well. I mean the whole card worked fine for a while even after flashing it. It's just when I changed the PSU and added another card (same model) that it died.

I've also gone through the motherboard BIOS on two different computers and haven't been able to see my GPU anywhere.

I'd like to know this as well. As far as I can tell, the only thing working is the LED lights, and just barely.

I'll try this when I get home. Heading out now for a couple of hours.

It was overclocked to 2250MHz, but it was running fine for a month OC'd, and it was running fine for a week with the modded bios and OC'd. Temperature was also below 60.

That is what I did. I've switched back and forth between the modded and unmodded bios both when the PC was on and off, and it's the same result. The fans don't spin and the GPU isn't detected by Windows 10. The only sign of life is the Sapphire logo is flickering weakly.

It's still under warranty, but what's the policy regarding a flashed bios? Would they even be able to tell, given the card can't even power up?

Same issue still even after flipping the bios switch. Fans on the Sapphire RX 570 aren't spinning and it's not being recognized by Windows 10.

Sorry, I'm a bit confused. Do you mean flip the bios switch while it's off, then boot into windows on the second bios, flip the switch back to the one that isn't working while its on and flash it back to stock?

And yes, I used Polaris Bios editor and the one click timing. Does that matter?

I flashed my Sapphire RX 570 Nitro+ 8GB about a week ago and it was working fine and was the only card in my franken-rig. Yesterday though, I changed my PSU (from 600W to 650W) and added a second Sapphire RX 570 to my rig, which was running on the stock bios. Upon start up, the fans on both cards were spinning very fast, and eventually the fans and lights on the modded card stopped working and it's not powering up at all now, while the unmodded card is working perfectly fine. I also had the PSU plugged into a watt meter, and it didn't go above 250W, which makes sense since the cards weren't under load.

Some things I've tried to fix this:
1. Testing the PCI slot with another card (which worked), and putting the bricked GPU into another rig (which didn't work)
2. Running ati pixel patcher
3. Running "atiflash -f -p 1 stock.rom" to flash the card back to stock, but I get an error message saying "adapter not found"

I'm now looking into flipping the bios switch, but I'm not sure if there's something else I should try. A lot of people have mentioned flashing/reflashing the card, but I don't know how that would work considering the card won't power up at all, which is why I wasn't surprised I got the "adapter not found" message.

Does anyone have any suggestions before I try to RMA this thing? If I flip the bios switch and it works, is there any way for me to reflash the other bios back to stock? Any help is appreciated.