Just ordered this i7 990x 24GB build - Do I need more power supply?

You should be fine with that PSU, but it is an unknown brand with unknown quality.

How much did you pay ?

$2,104. Got it here: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3705...

Could have built better for $1500.

With that said, is the power supply going to be ok? Or do I need to sub it out for something else?

- Do this PC gonna be full time on?

BTW, didn't found references about this PSU. Saw in it's own website that's capable of 36A combined in 12v rails. This should be enough (since you will not change the graphics card).
But, if I were you, I would exchange the PSU for a proven reliable one. I would be mad if I lost such computer due to a bad piece of hardware.

Thanks for addressing my question.

The PC might be full-time on during certain weeks. Here are the other Power Supply's the seller offers...Please let me know which I should choose:

Thermaltake TR2 430W ultra quiet
Logisys 600W ATX
CoolerMaster eXtreme Power 550W extra quiet
Antec Basiq 500w extra quiet
Ultra LSP 750W ATX
Thermaltake TR2 650W ultra quiet ATX
Corsair 750W ultra quiet ATX

To be honest I don't even know what Power Supply really means, or even what a Watt measures...I just want to be confident the computer will function properly and not break.

If you have not paid shop elsewhere.

As I have already paid for and now own this machine, Could you please address the question about the Power Supply? Thanks.

Antec Basiq 500w extra quiet
Thermaltake TR2 650W ultra quiet ATX
Corsair 750W ultra quiet ATX
Thermaltake TR2 430W ultra quiet

I don't care for rocketfish PSU's
I havent heard a good thing about them, in this forum anyway.