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NZXT S340 Elite SLI cooling: EZ mod, push/pull (kinda) without removing cable management bar

post #1 of 6
Thread Starter 
The Problem

It seems to be a pretty common issue keeping things cool in this case when running SLI. After some searching I found very little information about how to keep temps in check.

Came up with a cooling solution for my 1080 SLI setup in an S340 Elite. I guess you'd call it a push/half pull radiator fan set up in effort to cool the twin 1080s. Before the mod, GPU2 was reaching 91-93c while GPU1 was in the mid 70s. I'm running +85 on the core clock and + 450 on the memory clock. This seems to be about all that I can squeeze out of the EVGA FTWs before getting artifacts in testing. Either way, these temps were far to hot and I wasn't willing to give up the OC. Testing was done using the Fire Strike ultra 4k stress test. It performs 20 loops keeping both cards at or near 100% usage. I realize this isn't realistic for most games but some games come quite close i.e. watch dogs 2 and mass effect Andromeda really push the GPUs with max setting @ 4k.

The stock case fans are pretty much crap. Only rated around 20 cfm airflow. Replaced both the top and rear case fans with Cooler Master Fan Pros 120mm for the rear and 140mm on top. I did this before adding a 2nd GPU so the 91-93c temps were recorded after upgrading those fans (I imagine those number would be even higher with stock case fans)

The Solution

The natural next step was a push/pull radiator configuration in order to move more air through the RAD providing additional airflow through the case and across the GPUs. For those like me who looked into this know that a conventional push/pull config wont work on the S340 due to the cable management bar, it protrudes at the top blocking the needed clearance for the additional fans. Some people remove the cable management bar in order to pull this off. I was pretty against this idea. Not only is the cable bar functional but it's a big part of the character/aesthetics of this case IMO. I also had lighting plans that take advantage of the bar.

Initial testing showed me that simply setting one of the stock NZXT 120mm case fans on the other side of the rad with the exhaust end pointing toward the GPUs reduced temps by 4-5c. Now the OCD takes over and it's time to make it look good.

Note: This is all considering that you're using a 280mm radiator. The NZXT Kraken X62 in my case, although I'm sure you can do something similar with a 240.

This little gadget is key. We cant use a 140mm fan because the cable bar blocks us on both the top and bottom of the rad. Even with this, the backside screws are a pain to get in but it can be done. Link: https://www.amazon.com/gp/product/B0043GMY1U/ref=od_aui_detailpages00?ie=UTF8&psc=1




The best way to do this is to attach your fan to the converter bracket first and then mount the bracket and fan to the radiator. Keep in mind that at least for me, the sole purpose for this is to reduce GPU temps as CPU temps have been great even with a 5GHZ OC on the 7700k.

The results + Pics

I'm very happy with how this turned out. I'm using speed fan for fan curves that react to both CPU and GPU temps. For the love of all that is holy I don't know why speed fan seems to be the only app that can control all my fans based on GPU temps. If only the Asus fan expert app could do this..... ¯\_(ツ)_/¯

Using fairly quiet fan profiles (maxing at 70%) im seeing temps in the mid 80s which i can definitely deal with. For most games they don't go over 50% This keeps things reasonably quiet and prevents much GPU throttling. Just out of curiosity I did a 'God Run' with the front panel off and all fans @ 100% which brought temps down to low 70s. I hope this helps someone.







Edited by dakjones82 - 3/27/17 at 11:40am
post #2 of 6
Surprised no one responded to this. I had to register just to say thank you! This is exactly what I was looking for o solve my cooling problem in the same case. We have a very similar setup.

Quick question: would that 140 to 120 adapter fit at the top next to that cable management bar? I ask because I want to buy two if I can just to balance it out (rather than just have 1 at the bottom)
Edited by Ver7ig0 - 4/21/17 at 1:12pm
post #3 of 6
The entire reason he's using one is because the top portion of the cable management bar protrudes and will not accommodate even a 120mm fan in pull.

The bottom sits closer to the rear of the case which is what gives enough room (barely) to attach a 120mm pull fan. Normally people do this with 240mm Rad's leaving the top pull fan slot unoccupied.

I personally didn't see too much benefit from doing this as the cases biggest issue is the front panel being super restrictive. If you remove the front panel, temps drop 5-7C at the same fan speed. The filter itself is like 2C.
Edited by AngryLobster - 4/24/17 at 7:27pm
post #4 of 6
Quote:
Originally Posted by AngryLobster View Post

The entire reason he's using one is because the top portion of the cable management bar protrudes and will not accommodate even a 120mm fan in pull.

Yea, I see that now... I just wasn't 100% sure if that adapter could be used to somehow get one up there as well without removing that bar. After having bought this adapter now I can see for myself.
Quote:
The bottom sits closer to the rear of the case which is what gives enough room (barely) to attach a 120mm pull fan. Normally people do this with 240mm Rad's leaving the top pull fan slot unoccupied.

I personally didn't see too much benefit from doing this as the cases biggest issue is the front panel being super restrictive. If you remove the front panel, temps drop 5-7C at the same fan speed. The filter itself is like 2C.

So right after I saw this post I ordered a Delta fan and this adapter since I also run 1080 SLI in a S340 Elite case with a Kraken X62.

The cooling is quite amazing depending on the fan speed configuration. I am still working on the curves but along with gaming I also use Hashcat for password cracking with my 1080s so cooling is a must. I don't care so much about the noise when the wife isn't home to hear it.

Here are some quick results from doing some SHA1 cracking:
Code:
Run my cards @ 70% power. Run Delta fan @ 0% fan speed results in these max temps:

Card 1: 90 C
Card 2: 80 C

Run my cards @ 70% power. Run Delta fan @ 100% fan speed results in these max temps:

Card 1: 77 C
Card 2: 76 C

Amazing cooling on the top card (15C drop) but unfortunately I don't get the same cooling in the bottom card. Visually inspecting the the setup and doing "wet finger in the wind" tests I don't feel much cool air making it's way to the bottom card. But I also have an NZXT Hue+ box blocking a lot of airflow so I may move that and see what happens.

Regarding the front cover and filter blocking airflow...

SHA1 cracking with 1080s at 85% power and Delta fan at 100%:
Code:
Front cover on, filter on
Card 1: 77 C
Card 2: 83 C

Front cover removed, filter on
Card 1: 74 C
Card 2: 80 C

Front cover removed, filter removed
Card 1: 73 C
Card 2: 78 C

Interesting results. Though under normal loads (even gaming) I can easily keep this under 80 C without the Delta fan and with the filter and front cover on. OPs solution is close to perfect for what I am trying to achieve with my setup (positive pressure, little dust, high cooling, ultra-high GPU load).

Thank you!
Edited by Ver7ig0 - 4/25/17 at 10:19am
post #5 of 6
To finalize my testing results from yesterday, I removed the NZXT Hue+ controller box that was below card #2 (bottom card) and stuffed it under the cable/PSU shroud. This improved airflow and cooling. The top card's temperature remains the same as before but the bottom card's temperature dropped by 3 C.. Now at 85% power I hit max temps of 77C for the top card and 80C for the bottom card. Before it was 77/83.

I forgot to mention but before I even ran into this post, I re-greased my new 1080s with MX4... which dropped temps by 2-3C.

Interesting journey to go from overheating SLI in a S340 Elite to manageable temperatures. Thank you OP, and I hope that anyone else struggling with the same issues will find this thread.
Edited by Ver7ig0 - 4/26/17 at 10:28am
post #6 of 6
Yeah those are basically identical to the results I got when testing the front panel and filter. The front definitely is starved for air which you can compensate for by running fans at really high RPM but I'm not willing to do for noise sake. For that reason I swapped to a difference case.
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