DIM4700 -20 pin or 24 pin ?

Who-o-o-a-a no!  20 will NOT go into 24.  At least 4 wires will be mispositioned.  At best, it won't work.  At worst, smoke will come out (and you won't be able to put it back in).  The two components don't match and can't be used together.

Sorry, I don't know conclusively whether 4700 is a standard ATX pinout or not--Dell vacillates between standard and proprietary, and 4700 was on the 'hinge' of one of those vacillations.  (I lean toward proprietary.)

Google "Dell power adapter".  It will allow you to connect an aftermarket power supply to the Dell motherboard.  You'll still need a 24-pin supply, as the adapter doesn't make up the difference between 20 and 24, only the difference between Dell and everybody else.

Message Edited by x_lab rat on 09-10-200604:12 PM

The 20-pin may or may not be ATX.  They're used in smaller systems.  The only way I know of to tell for sure is when you still have the original supply, and you compare wire-color positions on the original vs. the replacement.  The colors are industry standard, so if they match from one plug to the other, the two supplies are interchangeable.

Hmm.  I worked on 4700s.  The same supply that fit all the other 24-pin MBs fit the 4700 too, so maybe they switched back to ATX sooner than I thought.

If the adapter website says you don't need one for 4700:  I can't see where they would 'lie', especially if it results in you not buying one.  Maybe try another adapter site for corroboration.  If two sites say you don't need an adapter, pretty safe to just buy an ATX supply and plug it in.