You'd benefit from having one more radiator.
The PSU can be shared, but you really have to check the individual load that you're effectively putting on each voltage rail, to make sure that you don't exceed the PSU capacity. Just add the amps, and compare it with the PSU specs.
The problem of course, is that you never really know what load your PC is putting, unless you measure it, which isn't obvious to everyone.
Otherwise a pelt (and someone correct me if I'm wrong) does not constitute a "bad" load on a PSU, to where it would interfere with the PC. i.e. it's not an inductive load (like a motor), nor a capacitive load (like a PC), so it's not going to cause any kind of spikes that might cause a PC to crash.
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