what is the diffrence between a single +12 Ralil and a dual +12v rail, what are the advantages and disadvantages
ive been lost on this subject since started building computers
The amperage is split up into 2 or 3 parts on dual or tri rail PSUs.
Instead of having one 50A rail, the PSU can by much more efficient by having power distributed across multiple lines, hence having two 25A rails.
This is done for safety reasons, as touching a 50A wire can be seriously dangerous, while touching a 25A wire is much less dangerous. The other reason this is done is because it can provide much more efficient power to your components.
Hope this answers your question. Mainly it's for safety.
On a power supply with multiple rails, you have to make sure to wire up everything according to the amount of amperage it needs. For example, you'll probably have to plug wires from one rail into a video card and wires from another rail into a different video card. You don't have to worry about any of this with a single rail PSU.
ok that cleared up my confusuion thats yall