Did I get the wrong power supply?

[kareem]

It seems like this CoolerMaster psu has a 20 pin connector while the Gigabyte board has 24 pins... sound right?

Do I need to get a different PSU?

- Kareem

[Baddog]

Yep

[BipolarBill]

Some PSUs allow you to snap the square 4-pin connector onto the end of the 20-pin connector.

[Lgbpop]

Be careful which 4-pin connector you try to do that with!! The P4 connector from the PSU will have a clip on its side; that connector is only for a P4 socket on the mobo. Many newer PSUs are 20+4 style, where the unneeded 4 pin segment (with no clip) can be separated so the remaining 20 can be used on an older 20-pin mobo.

If your CoolerMaster is brand-new, look for an orphaned, square 4-pin set where one side of the connector is a bit wider than the other and no clip on the side. That's probably the remainder of the 20+4 pin connector. The easiest way to tell is look at the 20+4 connector in the pic below, and cover the 4 pins (the breakaway part) on the right with your finger. Notice how the clip on the 20-pin side is off-center. If your 20-pin connector's clip is off-center, there's an orphaned 4-pin section there somewhere as well.

Weird and delightful visual effects may occur if you try to insert the P4 connector into the mobo socket, instead of the proper piece without the snap clip.

[Crashman]

It seems like this CoolerMaster psu has a 20 pin connector while the Gigabyte board has 24 pins... sound right?

Do I need to get a different PSU?

- Kareem

No. Gigabyte has a wider latch on its 24-pin connector that supports either 20-pin or 24-pin power.

But these guys are right, you should look to see if your power supply has an "orphaned" 4-pin connector that's different than the ATX12V connector.