Your ambient temps seem fine.
 
Non-blower style GPU's in SLI/Xfire always ran to heating issues since the second card is blowing hot air to the top card.  50c does seem a bit high but might be close to the norm.
 
I would still test the side fan as exhaust and intake and of course keep the front as intake and the top/back fans as exhaust. 
 
Yup, the 800D I believe would give you worse temps than you get now.  It was designed more for a simple watercooling loop than air.  I ran my Fermi's on air with the case door open otherwise they'd overheat.
 
On the other hand this Case would be ideal.  Made for air cooling and some AIO/water cooling.  So you can stick your H100 up top and have 3 high CFM fans blowing in from the front.  Lots of ventilation everywhere.  Its a new case hence the totally different design.
 
Other than my Antec 1200 for air cooling my next case for air would surely be that case.

My system 

 

 
Running Blacklist at 1.3v


 

killuchen

Lol, that case seems rather small O.O

 
HAHA that is why bought this :P

900D Corsair

1.3V I think that is the max for the standard LN bios

@ killuchen ...
This 780 Classified ACX is still on air, & the 4770K being cooled by a Swiftech H220 in a P/P exhaust config : 
 

 
These temps are at idle, & at pure stock settings for both the GPU & CPU (no OC), with the room ambient at @16 C at the time ...
... when running Valley at these stock settings & at this ambient, I was hitting about 48 C - 50 C max on the Classified card.
This is a Z87 / 4770K / 780 Classified ACX in a Carbide 500R case full of the Cougar 120mm PWM fans (11 total) ...
... intake is from the case front & side panel, & exhaust is from the rear panel & case top H220 config.
 
The point is that if I raise my room ambient by 5 C, my idle temps will raise by 5 C as well ...
... raise the room ambient by 10 C, the idle temps will go up by 10 C - ect ... ect... blah, blah, blah ...
... fairly simple math, that will work the same in reverse - drop your ambient by 5 C or 10 C ... blah, blah, blah ...
 
The other night I was running Valley, with a 4.5 on the CPU, & 1.3v on the Classified, & the ambient at about 18 C ...
... with the GPU fans at 80%, the GPU temp was still able to get down to 22 C - 23 C at idle in between runs.
The Classified card hit 59 C - 60 C on those Valley runs, at that OC, with GPU fan curve at 80-95%, & at that 18 C room ambient.
 
So your 25 C over room ambient is very high imo, & a good indicator that something is just not right with your set-up ...
... even with your 1.2v on the Classified x2, you shouldn't be anywhere near the 25 C over room ambient at idle, imho ...
 
Cases : I obviously like the "bang for the buck" Carbide 500R case for a GPU air cooled / budget CPU water cooled rig ...
... & would also say to take a good look at the new Phantek Enthoo Primo case - as you can fan the heck out of it ...
 
Re-TIM'ing your Classifieds is a good idea, as suggested by whitedragon; & MX-4 is a quality TIM ...
... I used MX-4 on the 4770K on this rig, but I'm going to redo it with the NanoGrease, & do expect it to drop the CPU temps.

killuchen

How's the airflow on the 900D? I'm in love with that case.

 
Airflow in the 900d... allofmywut...
 
Flows great through 1.2k mm of radiator as intended. 

killuchen

I'm thinking about replacing my coole master haf x. But since it has no side vent I'm scared my 780 classifieds will get hot.

 
 
Make a side vent..?

killuchen

Yea... your answers are not very helpful but thanks

 
What was wrong with my answer? If you have access to a power tool, make a side vent and mount a fan to it in your existing case. Buying a 900D and air cooling (or using an AIO) in it is like buying a Cadillac, tearing out the interior, and replacing it with that from a honda civic.

Andrew_K

killuchen

Yea... your answers are not very helpful but thanks

What was wrong with my answer? If you have access to a power tool, make a side vent and mount a fan to it in your existing case. Buying a 900D and air cooling (or using an AIO) in it is like buying a Cadillac, tearing out the interior, and replacing it with that from a honda civic.

 
You can't assume everyone is a modder for one Andrew.  Coming from you that got their rig done by a professional modder is like shooting self in foot.  Not bashing at all what so ever but you have to understand most people aren't artists and modders.  Some might need help or to understand certain things.  I for one aren't a modder and will ask for advice to those that have a clue.  But you can't go around telling people to cut up their box. 

jimrun

@ killuchen ...
This 780 Classified ACX is still on air, & the 4770K being cooled by a Swiftech H220 in a P/P exhaust config : 



These temps are at idle, & at pure stock settings for both the GPU & CPU (no OC), with the room ambient at @16 C at the time ...
... when running Valley at these stock settings & at this ambient, I was hitting about 48 C - 50 C max on the Classified card.
This is a Z87 / 4770K / 780 Classified ACX in a Carbide 500R case full of the Cougar 120mm PWM fans (11 total) ...
... intake is from the case front & side panel, & exhaust is from the rear panel & case top H220 config.

The point is that if I raise my room ambient by 5 C, my idle temps will raise by 5 C as well ...
... raise the room ambient by 10 C, the idle temps will go up by 10 C - ect ... ect... blah, blah, blah ...
... fairly simple math, that will work the same in reverse - drop your ambient by 5 C or 10 C ... blah, blah, blah ...

The other night I was running Valley, with a 4.5 on the CPU, & 1.3v on the Classified, & the ambient at about 18 C ...
... with the GPU fans at 80%, the GPU temp was still able to get down to 22 C - 23 C at idle in between runs.
The Classified card hit 59 C - 60 C on those Valley runs, at that OC, with GPU fan curve at 80-95%, & at that 18 C room ambient.

So your 25 C over room ambient is very high imo, & a good indicator that something is just not right with your set-up ...
... even with your 1.2v on the Classified x2, you shouldn't be anywhere near the 25 C over room ambient at idle, imho ...

Cases : I obviously like the "bang for the buck" Carbide 500R case for a GPU air cooled / budget CPU water cooled rig ...
... & would also say to take a good look at the new Phantek Enthoo Primo case - as you can fan the heck out of it ...

Re-TIM'ing your Classifieds is a good idea, as suggested by whitedragon; & MX-4 is a quality TIM ...
... I used MX-4 on the 4770K on this rig, but I'm going to redo it with the NanoGrease, & do expect it to drop the CPU temps.

 
I'm really liking the Phantek Enthoo Primo :D

I just got my Classified HydroCopper I find it odd that I can't go over 1.125 even with +38 mV (at stock max is 1.125 as well).  The card seems average 1150 out of the box max boost and I seem to be game stable at 1267 at that voltage but I find it odd the GPU voltage is so low.  The ASIC is 92.1%.

killuchen
I'm really liking the Phantek Enthoo Primo :D

Looks like Phantek USA is accepting Pre-Orders for their EP case : http://www.phanteksusa.com/products/phanteks-enthoo-primo ...
... they're still talking Sept shipping --- mid to late part of the month ...

I have a cooling / case question for you guys. Just installed my 2nd 780 Classified for SLI and my temps are just too high. By itself, a single card gets to about 72 at stock settings. With both cards in SLI I am actually capping the voltage at only 1.162 each card and clocks capped at a mild OC of 1202mhz, and the top card still cooks and breaks 80 degrees. I'd like to stick with air cooling for now.
 
So my question is: should I massively re-do my cooling or get a new case? Or both, lol. My current case is a Corsair Vengeance C70. I have two 120mm intake fans mounted on the hard drive cage (stock case set up), an inch away from the GPU's. One 120mm fan at the rear as exhaust. I have my Swiftech H220 240mm radiator attached to the top of the case with fans set as intake, blowing down into case, as was recommended by Swiftech. I have no side fans, the side is a plexi glass / plastic grill. 
 
So I'm pretty sure my airflow is abysmal. Do you guys think removing my H220 completely and replacing it with two 120mm fans (or 140mm fans for that matter, they will fit) to exhaust hot air out the top of the case will make any difference? I'd also in this scenario go back to using my Hyper 212 Evo cpu cooler, which would also help get the hot air out the back of the  case.
 
Or, should I ditch the C70 case and get a HAF X or 932, or an Antec 1100 (really like that extra fan option on bottom side of motherboard, and has a fan controller). I didn't realize when I bought it that the C70 has no fan controller or molex connection to connect fans to psu, so my case fans are all plugged into motherboard.
 
Thanks for any input. I don't need to massively OC the GPUs, just want to keep them a bit cooler.

Using 2 cards that blow air into the case, specialy 2 cards that run hot and/or are OC'd, usualy requir a side fan to work.
Do this..
Keep ur system on idle and feel the air temp with ur hand coming out of the ur exhaust fan. The do the same but have ur GPU's running at load, the heat will be like a hairdryer ..its crazy. Inside the case gets very hot with GPU with these kinds of coolers on runnign at full pelt.
A side exhaust fan will help alot, hell even slightly better fans help alot. I only have 1 780 classy and yet simply turning my 2 front intake fans up to max setting 6 from setting 4 using the CM stryker's fan controller (6 stage controller) makes about a 2c temp difference, and i do NOT have a side panel vent/fan.
 
So yea, SLI ACX coolers will requir a side fan and/or incredibly good front/bottom to back/top air flow. Remember heat rises, use ur top vent/fan as exhaust when possible.