ATX 1.3 PSU on a ATX 12v 2.01 motherboard

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I have a 550w True Power PSU which is for the ATX 1.3 standard (20 pins)
and have just bought an Asus A8N SLI Deluxe motherboard which has an ATX
2.01 standard (24 pins).

I'm intending to run 2 GeForce 6800GTs in a new PC and would like to
know if there are any issues involving connecting up the PSU to only the
first 20 pins on the motherboard.  I have checked the Asus site but
haven't come up with any information on the compatibility on this.

Alternatively should I use an adapter to convert my 20 pin plug to a 24
pin or just buy a new ATX 2.01 PSU?

Any advice appreciated, TIA

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