According to PC Power and Cooling, no. http://www.pcpower.com/technology/myths/#m8
----- Begin of copy from PC Power and Cooling ----- 8. 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. ----- End of copy from PC Power and Cooling ----- On the same page there is info on other myths on Power Supply. Tim "The Beave" Lider E-mail: [EMAIL PROTECTED] MSN: [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of j maccraw Sent: Thursday, May 08, 2008 8:26 PM To: hardware@hardwaregroup.com Subject: Re: [H] PC Power & Cooling S75QB 750W EPS12V Power Supply $149 free shipping Is a single 60A 12V rail better than multiple 12V rails totaling ~60A? Too bad the Red version is not on sale also! Who makes the Silencer Quad for PCP&C? Al wrote: > http://www.newegg.com/Product/Product.aspx?Item=N82E16817703009 > $149 free shipping > > http://promotions.newegg.com/PS/041508/index.html?cm_sp=SubCat_PowerSupplies -_-PS041508-_- > > > Al > > ____________________________________________________________________________ ________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
