Need help to decide if 750w is enough for i7-3770k and SLI GTX780

Jani Nieminen · Feb 27, 2015

So im going to get another GTX780 and im not sure if my Fractal Design R2 Integra 750W 80 plus bronze is enough to power up:

i7-3770k

and SLI GTX780 (another is MSI NF/OC)

So Should i get an better PSU or is this enough to power this system ?

Something like Corsair RM850, 80 PLUS Gold or Fractal Design Newton R3 1000W, 80 PLUS Platinum
(the cost difference between these is 20€ so which one of these would be more practical to buy if i need to buy a new PSU)

(more detail about the system if needed)Fractal Design Arc XL

Fractal Design Silent Series R2 4x 140mm fans

Kingston SSD V300 128GB

Seagate Barracuda 2TB 7200rpm

Asus P8Z77 WS

Kingston HyperX Beast 2400MHz 16GB

Asus PCE-N10

Whtwolf · Feb 27, 2015

The 750W might cut it a little tight on powering your system, the Nvidia site says that a 600W minimum requirement for one card. I looked at some of the rig pictures, and most of them has 1000W.

http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-780/specifications

Epsilon_0EVP · Feb 27, 2015

Whtwolf :

Remember most people go overkill on the PSU for safety, but it's not really necessary. The 780 has a TDP of 250W, and the 3770K has a TDP of 77W. That means that at 100% load (which won't be achieved in most usage scenarios, even heavy gaming) the machine would use about 600W. If we wish to be at 80% load of the PSU with this usage, this means a 750W PSU will suffice exactly.

This, of course, assumes the PSU is of good quality. The FD Integra 2 is not quite up to spec in this case, from what I see online, though. I would consider an upgrade to a higher quality one. A 750W should suffice, then, but make sure it is a good quality unit.

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Need help to decide if 750w is enough for i7-3770k and SLI GTX780

Jani Nieminen

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Whtwolf

Whtwolf

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Epsilon_0EVP

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