10-31-2021, 04:47 PM
DDR5 won't make a huge difference, since cracking is mostly done on the GPU directly. PCIe 5.0 is also not too important, unless you plan to operate your cards on x4 links.
As for the PSU: NEVER use mining hardware! Pretty much anything with a 'Mining' label is lacking substantially in quality, which is also a fire hazard in the worst case. PSUs of good manufacturers top out at 1700/1600W usually. This is probably insufficient for 4x 3080s, because Nvidias Ampere GPUs are known to have pretty hard spikes in terms of power usage. This might trip the Overcurrent Protection of the PSU, resulting in a immediate system shutdown. Also they have a TDP of 320W, which leaves really little headroom for the rest of the system.
Using 2 PSUs is possible, but only if you do not mix the circuits of the PSUs (this also trips a protection, but not sure which one). This means, you can't connect for example the 24 Pin mainboard connector with one PSU and the 8 Pin CPU connector with the other one. This also holds for the GPUs, because the draw up 75W from the PCIe slot directly and the rest from their 6/8 Pin connectors. So the only isolated devices that remain are your drives and fans. The only solution to successfully using 2 PSUs is to have good risers with seperate power connectors.
As for the PSU: NEVER use mining hardware! Pretty much anything with a 'Mining' label is lacking substantially in quality, which is also a fire hazard in the worst case. PSUs of good manufacturers top out at 1700/1600W usually. This is probably insufficient for 4x 3080s, because Nvidias Ampere GPUs are known to have pretty hard spikes in terms of power usage. This might trip the Overcurrent Protection of the PSU, resulting in a immediate system shutdown. Also they have a TDP of 320W, which leaves really little headroom for the rest of the system.
Using 2 PSUs is possible, but only if you do not mix the circuits of the PSUs (this also trips a protection, but not sure which one). This means, you can't connect for example the 24 Pin mainboard connector with one PSU and the 8 Pin CPU connector with the other one. This also holds for the GPUs, because the draw up 75W from the PCIe slot directly and the rest from their 6/8 Pin connectors. So the only isolated devices that remain are your drives and fans. The only solution to successfully using 2 PSUs is to have good risers with seperate power connectors.