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12v rails: 1 vs. 2? - Page 3

post #21 of 67
A single 12v rail seems to give the best stability for overclocking.

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


Corsair and PC power and cooling all use 1 single 12v rail and if u look at reviews on their PSU on newegg they give great results.

So if ure looking to buy a NEW PSU buy a single 12 rail psu.
post #22 of 67
Quote:
Originally Posted by Biskitz View Post
im about to ennoy some people

checky mee outy

i love posting the same link in multiple topics, can peeps please search for threads of a simaler nature before re-posting ?? is it soooo hard???? NOT! ...
Those "myths" are just marketing. Don't believe me? Go check JonnyGuru's site.

Quote:
Originally Posted by Benny99 View Post
A single 12v rail seems to give the best stability for overclocking.
...
So if ure looking to buy a NEW PSU buy a single 12 rail psu.
Nope. Wrong. Not true. They seem to give the best stability because they are quality PSUs regardless of how many rails.
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post #23 of 67
Thread Starter 
Quote:
Originally Posted by Biskitz View Post
im about to ennoy some people

checky mee outy

i love posting the same link in multiple topics, can peeps please search for threads of a simaler nature before re-posting ?? is it soooo hard???? NOT! ...
lol Biskitz.

Edit: I'm much more likely to believe DuckieHo with all of those reps.
post #24 of 67
Seriously PLEASE STOP. If you truly understand the multi-rail PSU design, help out. If you do not, please just stop spreading more mis-information.

Here are what PSUs are really like:
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post #25 of 67
So what does the OCP do ?
post #26 of 67
Quote:
Originally Posted by Benny99 View Post
So what does the OCP do ?
Over Current Protection.
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post #27 of 67
Yea but what does it do ?
post #28 of 67
Quote:
Originally Posted by Benny99 View Post
Yea but what does it do ?
Protects from over-current.
post #29 of 67
ok, i've come to a conculsion, buy a PC power psu, or go home nah, but seriously its all about brand reputation, pc power, siverstone and corsair all make amazingly good PSU's, it just comes down to if you want modular or not imo
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post #30 of 67
Quote:
Originally Posted by Benny99 View Post
Yea but what does it do ?
It creates the "rails" by limiting current. If a current draw exceeds the limit, the OCP triggers and shuts down the PSU.
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