How much watt does my system require?

[mangoland]

Hello everyone, I'm new to computer forums and I decided to join, because this site seems popular and has a great deal of information. Anyways here's my build.

PSU:PCP&C Silencer 750 Quad 750W ATX V2.2 EPS12V(blue)
MOBO: Asus P6T
CPU: i7 920
HSF:stock
RAM:OCZ 3x2GB DDR3 PC3-10666 1333 MHz Platinum XTC Triple Channel
V-Card:9800GTX+ DK
HDD: 1x1TB WD Black
DVD: LG DVD 22x R+/- lightscribe
Case: Antec Ninehundred Two with optional side.
Monitor: HP 22" HP w2207h

The upgrade I'm planning to do is probably add another 9800GTX+ DK and maybe a better HSF like the TRUE(cpu is running around 50 idle 70 at load) and possibly another 1TB HDD. Any help will be appreciated~ Thanks in advance!

 

[HOOfan 1]

Determining exactly how many watts your PC uses, is not an exact science, and is more of a guessing game.

The TRUE does not come with fans, and thus by itself does not use any power, it would depend on how many and the types of fan(s) you chosoe to put on it.

However, with your current Power Supply, you should be perfectly fine stepping up to a second 9800GTX+ and a TRUE with a couple of high performance fans.

 

[mangoland]

Thanks =) I just wanted reassurance that my power supply can handle it.