2x gtx680 ftw 4gb and i5-3570k overclocked a little. Size power supply will i need?

[GingerHamster19]

Says it all in the title

 

[jamesriley94]

Decent quality 750w, maybe 850 if you want a bit of headroom.

You may be better off with 670s though as you'll save a bit of money. What screens are you running?

 

[GingerHamster19]

Thanks for the quick reply dude! Might go with an 850 then!

I looked at some gtx 670's, but i want the extra gpu power! And 3x Asus PB278Q Monitor.

 

[jamesriley94]

Nah, you'll be fine with 670 SLI mate.
You'll be hitting 60 FPS on most games anyway IMO.

I run a single 670 at 5670x1080 and get good framerates. You really don't need to waste money on 680s. Get some decent 670s and overclock them.

 

[Deejeta]

ax750 or ax850.
Spend as much as you can really..

 

[From Russia w/ love]

Oh man,you really do need a lot of gpu power for those three monitors))))Not sure what fps you'll be getting though.

 

[GingerHamster19]

Okay, I will thanks!

 

[jamesriley94]

Oh, 3x of them?

You really sure you want to spend that kind of money? Even with 680 SLI you won't be getting decent frame rates

 

[GingerHamster19]

Thanks for the replies everyone!

 

[MacLeod]

According to reviews a pair of GTX680's will draw around 550 from the wall so a good 650 watt would be fine. Corsair, Seasonic would be the usual brands. Enermax and Kingwin would be good choices that aren't usually well known but make excellent PSU's.

 

[From Russia w/ love]

Cards struggle with one of those,let alone triple set up,mate.
Either go w/ 1080p x 3 or a single 1440p

Edit:Sorry if its off topic

 

[Rich_]

He's gettin the 4gb 680's guys.... quit reccomending the 670s lol.

 

[From Russia w/ love]

He's gettin the 4gb 680's guys.... quit reccomending the 670s lol.

Well even those two won't cut it IMO))

Hey GingerHamster19, just FYI, a single 680 still barely maxes out games @1440p,so given the scaling with current gen cards,you'll be needing 4 of those to max things out LOL

but 4 of those won't really work all that well

 

[SPS]

Well even those two won't cut it IMO))

Hey GingerHamster19, just FYI, a single 680 still barely maxes out games @1440p,so given the scaling with current gen cards,you'll be needing 4 of those to max things out LOL

but 4 of those won't really work all that well

What???? BF3 and Crysis 2 60 FPS average

According to reviews a pair of GTX680's will draw around 550 from the wall so a good 650 watt would be fine. Corsair, Seasonic would be the usual brands. Enermax and Kingwin would be good choices that aren't usually well known but make excellent PSU's.

Cutting it a bit fine that, you don't want to throttle your PSU and room for OC.

 

[seumasbeathan]

According to reviews a pair of GTX680's will draw around 550 from the wall so a good 650 watt would be fine. Corsair, Seasonic would be the usual brands. Enermax and Kingwin would be good choices that aren't usually well known but make excellent PSU's.

You have to remember a power supply is not 100% efficient, an AX650 will only actually give about 600w, therefore you would only have about 50w for everything else, get a 750w at least

 

[tinytomlogan]

Thanks for the quick reply dude! Might go with an 850 then!

I looked at some gtx 670's, but i want the extra gpu power! And 3x Asus PB278Q Monitor.

HAHAHAHAAAAAAAAAAAAAAAAAAAAAAAAA fucking dreaming. :lol::lol::lol:



Post back when you have bought them. Till then Im saying nothing.

 

[jamesriley94]

You have to remember a power supply is not 100% efficient, an AX650 will only actually give about 600w, therefore you would only have about 50w for everything else, get a 750w at least

I'm pretty sure that isn't what the efficiency part is?

I'd have thought their output would be 650w still, but in doing that, they'd be pulled around 700w say from the wall.

I don't know for sure, but I'd have thought we'd see a fair few problems if you're right. Plus it would be more common knowledge?
Also, with any power supply testing done in reviews with proper tech, they've had PSUs up to their limit, and measured their max output on the volt meter?

 

[MacLeod]

You have to remember a power supply is not 100% efficient, an AX650 will only actually give about 600w, therefore you would only have about 50w for everything else, get a 750w at least

Doesn't work that way. A 650 watt power supply will still make 650 watts. The efficiency shows how much power it puts out from the power it takes in. If its say 90% efficient, it'll need 720 watts from the wall to make that 650. So if a system with a pair of GTX680's draws 550 from the wall and is 80% efficient then the PSU is making 440 watts and so 650 would be fine.

A 750 would work fine too but you really don't want to go too big. It wont hurt anything but you're just spending more than you need to. And power supplies are most efficient when kept in the 50-75% range so if you're only drawing 400 watts at full load, anything over 800 and you're not getting the best bang for your buck out of your PSU because you're rarely at full load so your PSU is sitting there running at 20-30% capacity and wont be as efficient.

 

[tinytomlogan]

A 650w would not be advisable for 2x 680's most wont have enough PCIE's or deliver enough amps to power it all properly.

 

[MacLeod]

I know you're not supposed to argue with the boss but going off reviews, total system draw with a pair of GTX680's is less than 500 watts at the wall. In that case a 650 would be fine. Like I said tho, nothing wrong with a 750 for a little extra headroom but I don't think you need more than that.