HELP!! K8N Neo4/SLI Power Supply problem

Hi. I really need help.
I'm upgrading my computer and using my old case, a raidmax case with a 420w power supply.
The problem is, i discovered that the power supply for the motherboard is only 20 pin, while the motehrboard asks for 24 pin. I discovered that I can fit the 20 pin in theere, but still, 4 pin will be left empty. Is that okay? Or do I need a new power supply.
Thanks!

https://forum-en.msi.com/index.php?topic=85543.msg611646#msg611646

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