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2 780s

D

Deltief

Limp Gawd
Joined
Apr 29, 2011
Messages
274
will my corsair hx850 be enough power for 2 780,s I am running a 2500k, and want to buy a 2nd 780.
And will the 2500k be a bottleneck with 2 780s? thanks
 
HX750 is just enough for dual 480s with an overclocked i7-930 so I would imagine the HX850 would be enough for the 780s.

As long as you have a good motherboard giving 16x for both card or even 16x/8x 8x/8x shouldn`t be BN that much, nothing an overclock cant help, this also does depend on if game are cpu dependent of course as well as resolution which can most certainly have an impact on how effective the cpu will feed them, again game matters.

http://www.guru3d.com/articles_pages/geforce_gtx_780_sli_review,4.html max 544w=45.3a so most 750-850 power supplies can handle this, I know my corsair HX750 can do 63a on the 12v, and max load ~890w, the 850 max ~930w, either way you have some room to spare.
 
I'm running two Titans with the same psu and it's just fine.

I'm currently keeping my 3930k at stock though since it uses 500+ watts when overclocked. Seasonic X-1250 is on order. :p
 
that psu can easily handle 2 780 cards in sli with a 2500k. what resolution are you playing at? a stock 2500k will certainly hold back 780 sli at 1920x1080. even at 2560x1440 I would oc that 2500k to get best use of a gpu setup like that cause some games need it. even with the cpu oced to 4.0 you will dip below 60 fps in Hitman Absolution on occasion and and even more so in Crysis 3. Crysis 3 needs more than 4 threads to stay above 60 fps on very high settings. other than that you should have insanely high framerates. well unless you are playing GTA 4 on max settings as that game has poorly done shadows that will bring any cpu down into the 40s at times. lol
 
Last edited:
ThisMonsterLives said:
I'm running two Titans with the same psu and it's just fine.

I'm currently keeping my 3930k at stock though since it uses 500+ watts when overclocked. Seasonic X-1250 is on order. :p
Click to expand...
I hope you are not thinking that your cpu by itself uses 500 watts.
 
600W

3770K @ 4.5GHz
2X GTX 780
3X HDD'S
1X SSD
XONAR Card
Approx. 8 Fans fans



I'd say you are fine. Those 1000W+ PSUs are a dying breed. Ditched mine almost two years ago.
 
adriantrances said:
600W

3770K @ 4.5GHz
2X GTX 780
3X HDD'S
1X SSD
XONAR Card
Approx. 8 Fans fans



I'd say you are fine. Those 1000W+ PSUs are a dying breed. Ditched mine almost two years ago.
Click to expand...
you run all that on a 600 watt psu? sorry but that is just foolish.
 
cannondale06 said:
I hope you are not thinking that your cpu by itself uses 500 watts.
Click to expand...

I dunno why you're hoping that, since it's true.

2v31z6v.png


the i7-3930K does guzzle electricty when overclocked: a hideous 525W under load.
Click to expand...
 
well that has to be for full system but still that would mean well over 400 watts just for the cpu since its cpu load only test. that's insane. lol so for cpu to beat mine in games, it has to pull twice as much power as my entire computer uses. really that makes no sense as there is no normal way to cool a cpu using over 400 watts.
 
that still does not make much sence to my mind, it does not add up to me, 1 chip vs say a GPU which has many chips and much more transistors etc yet even massively clocked the gpu will end up using less then this, let alone this uses more then most SLI/CF configs, that is just messed up :p
 
i feel like if a chip needed 500w just for itself, people would need to invest in serious watercooling rigs. Even at stock, 238w of energy converts into alot of heat. are those numbers full system, or just CPU?
 
well yes and no, all depends on how efficient CPU are, x86 overall from my understanding are not inherently power efficient(performance yes but also push heat due to loss in the process) Intel uses Bulk process and the new 3d which is far more efficient then previous generations but this only applies if under a specific voltage(stock conditions more or less) AMD for the moment used SOI which is not quite as efficient a process but usually can stand more abuse as it is "looser".

The way it more or less has been comparing the 2 over the years for Intel voltage is needed but is also its enemy, keep it cool and voltage will do what it needs to do, for AMD it needs more voltage but the heat generated is far more its enemy.

But yeh, I think 500w is overblown that seems very high for just the cpu alone, the cpu is drawing more then nearly everything else one can use in the same system seems quite odd.
 
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