6850K + 1080SLI on water running hot

[kitaco]

Hello,

Last week ive put together my new system, here are some specs;

6850K 1.26V 4.3gHz
Geforce GTX 1080 FE SLI (overclocked +190 to core, +250 memory)
ASUS X99 Strix gaming motherboard
Phanteks Enthoo evolv ATX tempered glass
Full custom EKWB cooling loop with D5 pump running max

Here is the issue: I have a 240 slim rad up top as exhaust and a PE360 rad as intake both in push config. With this cooling setup i thought i would get decent temps. The system idles around 30C but when i play a game like Crysis 3 the cpu reaches 75C and the graphic cards around 70C. All my fans are running around 1300RPM cause i like a quiet system. But still i thought the temps would be better. I've removed the front panel of the case to increase airflow and that helps a bit but its not a long term solution.

Do i not have enough radiator space? Should i try a push pull config? any ideas are welcome.

Thank you

 

[1LiquidPC]

Can you provide any pics of your setup, nice parts list BTW Push/Pull won't change your temps more than a few degrees best case scenario. I believe the problem is elsewhere. Your temps do seem high, but you likely have 400+ Watts to cool from GPU's alone due to OC. Also, Broadwell-E CPUs are known to run hot and draw considerable power when OC'd. I'm running a custom loop myself, and don't have temps that high. In gaming, at highest I've seen my CPU reaches maybe 55C mid-summer and my two 970s low 40C range. I'm not running as much of a GPU load as you, but my CPU should be similar power draw and heat output. I also have my motherboard VRMs in my loop. My radiator fans I have set to run constant at about 1200 RPM as well. My radiators are also setup in a push config only. It's possible you have a restriction somewhere, as both your CPU and GPUs are higher temps, so a bad block mount is unlikely. It could be capacity as you pointed out, plus using the slim 240. I'm using 2 360mm and 1 240mm, all thicker style radiators.

 

[kitaco]

Thanx for the reply, ill try and post some photo's ! I've seen people with similar setup getting great temps (http://pcpartpicker.com/b/zPtJ7P). When I stress test the CPU (real bench, intel burn test) it never goes over 60C. But when i game and the 1080's start getting hot, they heat up the entire loop and coolant wich lowers the cooling capacity for my cpu. I think that is the problem, does that mean I need more Radiator space? I can put in a thicker 240 but not enough room for another 360 i'm afraid.

 

[1LiquidPC]

I understand what you're saying. Given your situation, assuming no restriction somewhere, radiator capacity seems to be the cause given temp info. I don't think a thicker 240 would have a great affect on lowering temps though. Looking at website, it looks like a 360 can fit in top as well. Is this an option? Dual loop an option?

 

[kitaco]

Thank you for the suggestion. With the pe360 in the front i cant fit a 360 up top. Yesterday i tried setting the 240 in push pull and that helped a little but its not great. i can maybe fit a slim 120 rad on the exhaust in the back but do you think that will help or shouldn't i bother with that?

 

[dylanestrada]

Yea sounds like you need to push the hot air coming from your sli setup out of the case, if you can get two case fans stacked upon one another, blowing at the bottom of your case towards your sli setup, you'll see significantly better temps.

 

[dylanestrada]

I also have a Phanteks case, its the Eclipse model, these babies are notorious for trapping heat inside unless you can get extreme air flow (I have 6 fans total inside of my rig)

 

[1LiquidPC]

At work now, look into this more a later today. Just to check, are your fans currently running at their max capable speed? I know you mentioned about running at 1300 rpm or so for noise, but I was wondering what temps would drop to at a higher speed. I personally wouldn't bother with the additional 120mm radiator in the rear. The temp drop would be minimal and an extra headache trying to add the fittings and bends to integrate into your loop. Given what your trying to cool, and your radiator options, I think you only have a few choices for lowering temps. First option would be faster RPM fans should bring temps down. I was running loud 38mm fans on a 480 Radiator years back on my dual-gpu HD 6990 Radeon card and OC'd 980X at the time. Temps were great, but noise was LOUD. Of course, this defeats part of the reason for a custom loop in the first place. My second thought would be a dual loop setup, so you can separate CPU and GPU heat. Of course, you'd need to buy another pump/res and start all over again for tubing and fittings arrangement. Third option, would you consider another case and more rads?? Even though there are plenty of WC friendly cases out there, I think most are designed for mounting multiple AIO kits in mind. Most folks aren't trying to cool 400W of OC'd GPU heat along with X99 chipset based CPUs. Outside of these choices, case modding of some sort or an external radiator, though I wouldn't go this route personally. Let me know if any of this is helpful. I'll do what I can to help you out.