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ARCTIC Accelero Twin Turbo II SLI to hot :-(

post #1 of 6
Thread Starter 
I have 2 GTX 670 FTW LE's, I got tired of the stock coolers running 80% at 75C so I bought 2 of these Artic Cooling units. They fit in my midtower barely, and when only 1 is present the full load is 64C instead of 75C. However in SLI the bottom goes to like 70C the top climbs to an insane 80 or more!

I'm kinda lost because theres no space between the coolers in SLI and even with a side fan on it still wouldn't cool them. I tried a bottom as well but really I got the same results, 80C top bottom like 70C.

I didn't leave it running that long either so I assume the top SLI would reach probably 84C or more it just kept going up which is insane IMO.

Anyways what can I do? I guess I can sell the 2nd one but that would suck, also I don't wanna use the stock cooler and it would be a pain to take the heatsinks off anyway =/

What do you guys think, would a PCIE riser help at all? How do they work. I can't fit anything but a midtower in my desk but it doesn't matter because the problem is the darn things are right next to eachother with no free slots, ugh
post #2 of 6
I've got 2x Asus GTX 670 DCU II on a Maximus IV Gene-Z/Gen3 which has roughly a 3mm gap between the cards.

The top card ran very hot (late 80's to early 90's running Heaven 4.0) and the bottom one ran about 25 degrees cooler.

After buying this bracket (http://www.moddiy.com/products/Expansion-Slot-Side-Fan-Mounting-Kit.html) and a Corsair SP120 High Performance fan I was able to reduce the top card temp to a max of 72 degrees in Heaven 4.0.

Some games (Assassins Creed 3, Splinter Cell Blacklist and Arma 3) make the temps go a little higher but not by much.

One thing i would try would be to replace the paste on the cards, maybe there isn't enough and it's causing the heat issue. When I had my 6970 with an Accelero cooler it ran at a max temp of 56 degrees but that was after 3 reseats.

Not much help but just thought I'd chime in.
post #3 of 6
You need better case cooling. 1x 670 runs 64c and bottom of 2x 670's runs 70c indicates air going to the bottom 670 is at least 6c hotter... that's assuming it's working as hard with 2x 670s as it was running solo.

Case cooling is hardest part of a build and the most neglected.
You might find this helpful. I post this basic but by no means complete tutorial often. It's a work in progress : Warning: Spoiler! (Click to show)
There is much more to cooling than good cases and good CPU / GPU coolers. Modern GPU's make more heat than CPU... and getting that heat out of the case can be a challenge.

Setting up the case to cool properly is the hardest and most time consuming part of a build... And the most neglected by most builders.

We need at least as much volume of air flowing through the case as the total of CPU and GPU fans flow through their coolers. If we do not have as much air coming into and going out of case as CPU and GPU coolers are passing through and heating up than some of that heated cooler exhaust has to be re-circulated through the coolers. This means the cooler run hotter because the air going through them is hotter.

Cases, especially those with filters, usually benefit from fans with higher static pressure ratings than stock fans... "cooler" fans instead of "case" fans.
Intakes are typically more restricted than exhaust; air filter, more restrictive grill, HDD cage, etc.
I prefer more intake than exhaust. And don't confuse number of fans with amount of airflow... or airflow with airblow

airflow is flowing cool air from intake to component and flowing hot air from component out of case without the hot air mixing with the cool air.

airblow is lots of fans blowing air with some of hot air from components mixing with cool air making it warmer resulting in warm air not cooling components as well as the cool air will.

Putting fans in case as intake and/or exhaust is only the first step. These fans only move air in and out of case.

This does not mean heated air is not mixing with cool air.

Nor does it mean cool air is going to where it is needed.

Getting the air to flow inside of case properly is even more important. We still need to manage where the air flows inside the case. We can do this several ways; deflectors, cooler intake fans, exhaust fans, removing vent grills, using fans with higher pressure/airflow, building ducts to or from CPU/GPU cooler, etc.

Using a remote temperature sensor to monitor what air temps are is the key to finding out where the cool air is flowing and knowing heated air is not mixing into it. By monitoring this we can than make changes to get airflow the way we want it.

I monitor the temps with a cheap indoor/outdoor wired remote or terrarium digital thermometer. Twist a piece of stiff insulated wire into the last 8" of sensor lead so you can bend it to position sensor where you want it... like 40mm in front of your GPU cooler/radiator intake.. to see what the air temp going into CPU / GPU cooler is compared to room temp. The closer it is to room temp the better.. Shouldn't be more 5c maximum, 2-3c is what I usually end up with after 30 minutes full load on both CPU and GPU. Warning: Spoiler! (Click to show)
Processed By eBay with ImageMagick, R1.1.1.M2a
post #4 of 6
Thread Starter 
I decided what I'll have to do is use something like the ARCTIC Accelero Hybrid Extreme for the top GTX 670 FTW and then I'll continue using the Twin Turbo on the bottom along with adding a side fan or bottom to the case. I think this should work as someone else had similar issues with 3 way SLI and he solved it by adding one of these inbetween the other 2. I'll let you guys know next week how it goes.
post #5 of 6
Do let us know. Will be a good comparison. thumb.gif
post #6 of 6
Thread Starter 
I completely re-organized my case, I added more fans now I have a total of 6 on the case, 2 on the CPU. I also changed the 3770k from 4.7ghz @ 1.250 core volts to 4.6ghz @ 1.2 core volts which gives me around 78C on the Noctua NH-D14 with the low silence adapters. The GTX 670 FTW I have is now running at a cool 61C full load, not bad! The only thing now is to wait till my Hybrid arrives, then try using it on the top slotted card since that's the one that isn't going to be getting airflow like the bottom one.

I'm hoping the top will be very cool with this change but we'll see, I shall report back in a week or so
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