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Where is the -5v rail on a Silverstone ST75ZF?

Originally posted by: rise
what do you need a -5v rail for?
Click to expand...
Well I have no idea. What are they for? That's kind of also what I'm asking. Why do my other 24-pin PSU's have it, and why is it failing the test on my PS tester because it has no -5v yet the tester tests for it?

 
Originally posted by: Sniper82
is it possible its both 20pin and 24pin tester?
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Yes it tests both. But I would think that when a 24-pin PS is hooked up, it would know that it's not supposed to have a -5v. ? But that's not it because my other 24-pin PSU's have it, so why do my other 24-pin PSU's have the -5v?

 
Its probably just a legacy feature if the 24pin psu has it. Its no longer used any more on current mbs.
 
Originally posted by: computer
Originally posted by: rise
what do you need a -5v rail for?
Click to expand...
Well I have no idea. What are they for? That's kind of also what I'm asking. Why do my other 24-pin PSU's have it, and why is it failing the test on my PS tester because it has no -5v yet the tester tests for it?
Click to expand...

IIRC they were used primarily for ISA cards. Some power supplies still have them for compatibility; I believe the requirement was finally dropped from the ATX spec.
 
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