Power Supply

Hello,
I have 2 computers currently:

Computer 1
500 watt power supply 20 pin
3.4ghz P4
Abit duramax Motherboard
1 gig of 533 RAM
120gig Sata Drive
80 gig IDE Drive
NEC 16x DVD burner

Computer 2
400 watt power supply
2.6ghz P4
MSI neo2 865pe
1.5gig 400mhz RAM
DVD-ROM
IDE Drives:
2-200gig WD
1-160gig Maxtor
1-120gig Maxtor
1-80gig Maxtor

I have been having a lot of problems with computer 2 to find out the
power supply can't handle the power requirerments. What my plan was
was to swap computer 1's 500 Power supply into computer 2 and
purchasing a new 24pin Power supply for computer 1 since i am using a
20 ping connector with the Abit motherboard which has the 24pin
connector on it. Can anyone tell me if i will need more power than a
500 watt power supply to power computer 2? If it will, what would you
recommend for a 24 power supply for computer 1? Thanks for the help.

I think 500 W should be enough for 2nd computer, but you should always
have a little more than minimal, so it's your decision...
My recommendation - get larger power supply.