Hi
If I connect a gpu to a cable pcie of a psu and the riser with a cable of a different psu, can it be a problem?
Apologies for my bad command of english.
you shouldn't do that. every GPU/riser pair should be powered from one common power source.
Why do you give advice and at the same time do not understand the subject at all? This is a post for post? Go to another branch! My rigs have been working for several years without problems from several power supplies. The motherboard and riser are powered by ATX power supply and additional power supply of GPU of two neighboring rigs is connected to powerful server power supply.