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Yep. 24 v. 20 pins on the main connector. Older PSU designs also
didn't have the separate 4-pin connector.
See
http://en.wikipedia.org/wiki/ATX, specifically the section right
above the pinout. The pictured PSU (
http://en.wikipedia.org/wiki/Image:ATX-Netzteil.jpg ) shows the
supplemental 4-pin connector next to the main connector.
Besides all that, depending on the original computer, the current power
supply may not be able to power a modern system. Some old machines had
PSUs as small as 135W; a 300W or so is the dead minimum I'd put in a
recent machine and even then only a low-end system. High-end Core2Duo
or Core2Quads, PCI Express Graphics, multiple hard drives, and other
power-hungry components lead to average 400-500W nits, sometimes even
higher. For those who run multiple high-end graphics cards there are
1300W-range units (ridiculous for mere mortals).
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