Dual Power
Posted in Jewellery on 01/15/2010 01:00 am by admin
When selecting a power supply for a computer, do you need dual 12 volt rails?
Why do some power supplies have dual 12 volt rails? Is that to take the load off the other 12 volt rails? And how come some are listed (on newegg) as dual 12 volt, when they have 3 12 volt rails, and some are listed as dual and they only have 2 12 volt rails? And some have dual 12 volt rails and they have 4 12 volt rails? They usually have lower amperages on each rail. If I install an 8800 GTX that requires at leats 28 amps on a 12 volt rail, and I have 4 12 volt rails, does that mean it will use 2 12 volt rails if they have, say, 18 amps on each? Thanks.
no you don’t need dual 12 volt rails
i use a single 12 volt raid on my 7950 gpu sli set up
a 750w pacific power and cooling PSU
… from the PPC website….
ARE MULTIPLE 12-VOLT RAILS BETTER THAN A SINGLE 12-VOLT RAIL?
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.
So You Want a Free Society? Introducing Dual Power in a Nutshell
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