I've got a MSI K8N Neo4-F mobo with a 24-pin connector. My Ultra X-connet has a 20-pin connector. Right now I'm running a 20-pin connector from the PSU to the lower 20 pins on my mobo, leaving the top 4 pins empty. The 20 to 24-pin power cables take up all 24 pins on the mobo. Can anyone explain this to me? What is the difference between a 20-pin and a 24-pin power connector? What is the advantage in getting a 20 to 24-pin power cable and filling up those empty 4 slots? Are there any negative effects to continue using the 20-pin power cable and leaving the top 4 slots open? Is there any effect on system stability while overclocking with the 20-pin cable or the 20 to 24-pin converter?