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Tech Helproom

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What's happened to the -5volt supply on PSU's

wile e

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Hi, I recently bought two EVO Labs PSU's one for a PC that would freeze and after checking and replacing the memory, the processor, and the graphics card the computer still froze. As a last resort I decided to replace the PSU as well, I own a PSU checking device and noticed that the checker did not show the -5volts. I contacted EVO Labs who suggested I return the PSU's and obtain replacements, I duly returned to my local computer store and explained about the missing -5volt. They checked the rest of their stock which had the same problem, I got a refund and tried another store this time two ACE psu's and lo and behold they have exactly the same problem (no -5volt) I have four pc's and all of them on testing do show -5volts. Is this a design fault or is the -5volts not necessary any more?

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onthelimit1 I have looked again at the motherboard and there are no ISA slots so presumably no ISA bus so why this board wants a -5V supply is a mystery to me.

wile e As both Fruitbat and onthelimit1 have pointed out the reason for modern ATX power units not having a -5V supply is that it became redundant with the removal of the ISA bus on modern boards.

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