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4 separate 32A rails would be rare. Most 800w PSU have a single 60A+ rail or two 30A+ rails. My guess is you have 2 32A rails with four cable runs.
The only think that is going to come close to maxing out a rail is going to be a hungry video card. SO just make sure you don't put two video cards on the same 32A rail and you'll be fine.
The rest of a system is not that power hungry, so it won't really matter unless you have like 12 hard drives.