Powersupply enough for SLI?

[T101]

I have a system that contains;
Asus P8P67 Deluxe Rev B3
Intel Core i7 2600k (non-overclocked)
4 x 4GB Corsair Vengeance 1600Mhz DDR3
2 x 500GB Seagate 7200RPM (Raid 0)
2 x 1500 GB Seagate 7200RPM
3 x 2000 GB Seagate 5400/7200RPM
1 x Creative X-Fi
1 x ATI 550 Pro TV Tuner PCI-E Card
1 x Corsair TX750W PSU
3 x 120 mm case fans
1 x 200 mm case fans
1 x GeForce 470GTX

And I have ordered another GeForce 470 to run a SLI configuration. Though I am concerned that my power supply is not enough? I have used online calculator (http://www.thermaltake.outervision.com/Power) and end up on a 755W recommended rating. I have never before used a system with this many components, thats why I have never had to worry about the PSU load. So I ask you, is the power supply I have enough, or should I cancel the order on my second 470?

 

[dma0991]

The GTX470 seems to be quite a power hungry card compared to the GTX570. Plus you have a lot of HDD in that rig and 32GB of RAM. I suggest a 800W PSU just to be on the safe side and when it comes to PSU having a little bit more than you need doesn't hurt.

 

[T101]

error correction 16 GB ram.

 

[T101]

I ended up ordering a Corsair AX 1200W, which should be more than sufficient for anything I throw at it for a while.