Re: All Graphics Cards related queries here.
Multiple rails are always better, allows the load to be shared reducing the heat generated at each rail, provides relatively better stability, but Corsair makes their PSUs with high quality materials, so its not affected.
I dont think..always.is correct to say...
"With all the hype about multiple 12-volt rails (ads claim that two rails is better than one, five is better than four, etc.), you'd think it was a better design. Unfortunately, it's not!
Here are the facts: A large, single 12-volt rail (without a 240VA limit) can transfer 100% of the 12-volt output from the PSU to the computer, while a multi-rail 12-volt design has distribution losses of up to 30% of the power supply's rating. Those losses occur because power literally gets "trapped" on under-utilized rails. For example, if the 12-volt rail that powers the CPU is rated for 17 amps and the CPU only uses 7A, the remaining 10A is unusable, since it is isolated from the rest of the system.
Since the maximum current from any one 12-volt rail of a multiple-rail PSU is limited to 20 amps (240VA / 12 volts = 20 amps), PCs with high-performance components that draw over 20 amps from the same rail are subject to over-current shutdowns. With power requirements for multiple processors and graphics cards continuing to grow, the multiple-rail design, with its 240VA limit per rail, is basically obsolete.
PC Power and Cooling is once again leading the industry. All of our power supplies now feature a large, single 12-volt rail. The design is favored by major processor and graphics companies, complies with EPS12V specs (the 240VA limit is not a
requirement) and is approved by all major safety agencies such as UL and TUV.3"
Also these can be read
here and
here and
here.
Overall I can say, reading the above links..even multi rail is better, as long as one calculates the PSU requirement well...!
The Corsair HX450 and VX450 both offer 33A on the 12V rails.
