Upgrade PSU?

[Fiirkan]

Hey, My girlfriend is currently upgrading her computer, and we're wondering if we need to change out her PSU, currently she has a 750W PSU running the following specs

Asus ROG Rampage III Gene
Intel i7-930 2.8GHz
Asus GeForce GTX 570 DirectCU II Video Card
16GB Kingston Hyper PC3-1600 DDR3 RAM
Corsair H70 CPU cooler
5 120mm Case fans
1 230mm Case fan
4 HDD
LG Blueray drive

she is making the following changes
Asus ROG Rampage IV Extreme
Intel i7-3930K 3.2GHz
Corsair H100 CPU cooler
all other items are remaining the same.

any input would be appreciated, if we need to swap it out then we'd like to get it ordered before her parts get here.

Thanks :)

[Skid]

Sticky thread at the top of this forum you should have a look at: [#6821]
Really useful web tool you should know about: PSU Calculator
Short answer, if your not overclocking, your probably be fine if its a good 750W PSU, if you are overclocking, you might want to beef it up a bit.

[Fiirkan]

well that was a fail on me, I've been on forums long enough to know that there should have been something stickied like that.

Thanks for the info, this will definitely come in handy.

[Paradigm Shifter]

I'd be surprised if power draw increased any significant amount moving to that 3930K (unless you overclock it, when it will start to gobble power) from an i7 930. The most power hungry thing in modern high-end systems is really the GPU.

[Fiirkan]

She was unsure as well, I didn't see it doing much more, but apparently under load the upgraded motherboard and CPU do draw more, she was looking online and posting on other forums and it was recommended that she upgrade. so she has orderd and XFX 1250
http://ncix.com/products/?sku=65627&vpn=P11250BEFX&manufacture=XFX&promoid=1259

Thanks for the input guys :)

[Haldi]

If i overclock my i7-3930K to 4.5ghz @1.38V and my two HD7970 to [email protected] i get 770W power drain.
If i undervolt my two 7970 to 0.9V and 925mhz, CPU to 4ghz. i get 440W!
Stock settings CPU to 4ghz is 550W :)

(tested with Unigine Heaven 2.5 Peak Wattage! so no full cpu load. But hey, it's a 125W (or was it 135W ?) TDP CPU!)