Want to add second card

[Archex]

This is my current set up
sabertooth z77
4770k@4.4
EVGA 220-G2-0850-XR
4 active drives
1-03G-P4-3888-KR

I would like to know if i can safely add another 03G-P4-3888-KR, or would I have to upgrade my psu? thanks

Edit: I want to improve vray-rt's performance. GPU temp shows temps near or at 80 C and load at 99% while in use.

 

[azca]

yes, you can add another 780ti; your psu should be good

 

[synphul]

You should be able to add another 780ti with that psu. It's a quality 850w unit. Anandtech shows total system draw with 780ti's sli'd to be around 650w, so even with the additional hard drives you should be fine. Overclocking the cpu and both gpu's may get it close to its limits depending how far everything was overclocked but I would think it should still be ok.

 

[spentshells]

http://www.xbitlabs.com/articles/graphics/display/geforce-gtx-780-ti-sli_5.html

According to this review you are able to run your sytem at full load with two 780 ti's

In general you won't ever want to run your system at full load. You can do it but if it were me I'd opt for a slightly better psu, I am always telling people they need less psu, in this cae I feel it is quite the opposite if you intend to load the machine up regularly.

Yes you can, but no you shouldn't. You generally won't want to exceed more 80% of the psu's rated capacity when at load and this leaves you around 87%-92% by estimate with your overclock.

Mind you despite this caution you will generally never reach full load while gaming so I may be just urging you to be safe with 1000 in gpu's and another 400 in system.