Need some help recommending PSU wattage for my system

[lopgok]

I really like using the kill-a-watt power meter. It costs less than $20 and tells you the instantaneous power usage of whatever is plugged into it. Of course that won't help if you are building a all new system, but it sure will help letting you know if your power supply is maxed out. Also quite handy to see how loaded up a UPS is.

In general, I really like seasonic power supplies. They are generally quite reliable and quiet. For a system that really needs a 750w+ power supply, I highly recommend spending a few extra bucks to get a gold or platinum efficiency power supply. It won't save enough electricity to justify the extra cost, but it will make less heat and less noise. Also most gold and platinum power supplys are pretty well constructed and have long warranties. My rosewill fortress (platinum) has a 7 year warranty.

 

[ikameozero]

Forget links, we know, LOL!

A quality 750W PSU would be PLENTY even with overclocking both GPUs and the CPU. A 650W would be fine really.

2x 670s = 340W MAX load stock speeds. about 375W (and you wont hit 375W and MAY hit 340W when overclocked to the hilt).
CPU = 77W. Overclocked, where you are or a bit further, perhaps 100-110W.
board/ram/water = 50W

So we have 375+110+50 = 535W

It won't even hit that value unless you are stress testing both CPU and GPU's while overclocked. You will likely barely break 400W at most when gaming.

dont get a 500 watt psu when you have sli cards the fact is u want a 750ish around that area maybe even a 850ish so if u wanna add beasty cards in the future it will be more future proof since the 670's are already past there prime wayyyy past...

its like why skimp on 40$ or 30 pounds when for that u get an extra 200-300 watts plus u never want your system running off a power supply which only has just enough power to run it because then the power supply will be running at full load 24/7 and will have a short life cycle.

gl with your choice id say 750w minimum to be safe and 850w would be smarter/more future proof since ull probably upgrade your gpu's for better sli in the future.

 

[ATMINSIDE]

dont get a 500 watt psu when you have sli cards the fact is u want a 750ish around that area maybe even a 850ish so if u wanna add beasty cards in the future it will be more future proof since the 670's are already past there prime wayyyy past...

its like why skimp on 40$ or 30 pounds when for that u get an extra 200-300 watts plus u never want your system running off a power supply which only has just enough power to run it because then the power supply will be running at full load 24/7 and will have a short life cycle.

gl with your choice id say 750w minimum to be safe and 850w would be smarter/more future proof since ull probably upgrade your gpu's for better sli in the future.

He never said to get a 500W PSU. He said 650-750W.

You sound like the person that buys a cheap POS PSU that's supposed to supply more wattage than you need, even though what you're really doing is hooking your new equipment to a power supply that's ready to fail due to cheap components.

 

[Knufire]

Stuff gets more power efficient as time goes on. So cards he upgrades to in the future will probably use less power.

Anything 670 and below, for dual cards, 650W is fine. For dual 7970/770/680/780/Titan, 750W is usually fine.

 

[Bobnova]

dont get a 500 watt psu when you have sli cards the fact is u want a 750ish around that area maybe even a 850ish so if u wanna add beasty cards in the future it will be more future proof since the 670's are already past there prime wayyyy past...

its like why skimp on 40$ or 30 pounds when for that u get an extra 200-300 watts plus u never want your system running off a power supply which only has just enough power to run it because then the power supply will be running at full load 24/7 and will have a short life cycle.

gl with your choice id say 750w minimum to be safe and 850w would be smarter/more future proof since ull probably upgrade your gpu's for better sli in the future.

Good PSUs will do 100% load for, at a minimum, their warranty period.
You really could run a 2x670+3770k system on a 550w PSU, if it was a good PSU. You wouldn't have any problems, either.

As for the 670 being past it's prime... Not really. The 760 is a 670 with a new improved name, it's still quite current.