Watercooled octane render workstation TITAN+3x 780 6GB

[smicha]

Due to large interest of power draw, min PSU required I am posting results from heavy stress tests from FurMark and for Octane. I had ability only to stress 780 on FurMark, single and 3-way SLI. Titan is tested in Octane.

System at startup: 170-400 W, idle 170 W

GTX 780:
FurMark 100% power 440 W
FurMark 110% power 470 W
Octane (not overclocked) 68% power 320 W

3x GTX780 (3way SLI on for FurMark), Titan off.
FurMark 100% power 957 W
FurMark 110% power 1035 W
Octane (not overclocked) 68% power 670 W
Octane (overclocked @1200core, 7000 mem.) 77% power 730 W

3x GTX 780 + Titan
Octane 917 W
Octane (overclocked) 955 W


Hence:
GTX 780 draws 150W (180W overclocked) in Octane, while in Furmark 270-300W
GTX Titan draws 170W (225 overclocked) in Octane (FurMark not available)

To run safely 4x gpus - like 4x 780, or 4x titans you need 1200+W PSU with peak to 1500W. Octane although will use about 1000 W. So the rest power will be used for CPU and peaks.

[glimpse]

Thanks for Your effort, Smicha, providing those numbers =) really useful info!

[Tutor]

Thanks Smicha for the reference and congrats for a superior build.

[smicha]

Some changes in the build:

1. I am upgrading to 32GB of RAM. Agisoft Photoscan is RAM hungry especially on full frame camera images. Sold my GoodRam 4x4 and bought 2x8GB, again GoodRam. They never failed me down. Waiting for another 16GB.

2. The pumps are moved on anti-vibration sponge. The noise was reduced substantially. Thanks Glimps for earlier remarks - indeed the 5.25 bay is not a good place for pumps.

3. Noctua fans seem to be loud at full speed. I am not sure if this is due their higher static pressure. I was to replace them by be-quiet fans but I am giving a shot to the industrial grade fan San Ace by Sanyo Denki - some results soon. Just ordered one for a test.
http://www2.mouser.com/ProductDetail/Sa ... aOVnjog%3d

[glimpse]

2. The pumps are moved on anti-vibration sponge. The noise was reduced substantially. Thanks Glimps for earlier remarks - indeed the 5.25 bay is not a good place for pumps.

3. Noctua fans seem to be loud at full speed. I am not sure if this is due their higher static pressure. I was to replace them by be-quiet fans but I am giving a shot to the industrial grade fan San Ace by Sanyo Denki - some results soon. Just ordered one for a test.
http://www2.mouser.com/ProductDetail/Sa ... aOVnjog%3d

cheers, Happy to help =)

&that's the reason why I dislike all BayRes combos - if You mound them directly they do make some hum
(frequency depend on characteristics of the case), but it's not pleasant.

& yeah, noticed Noctuas are a bit loud if maxed out, especially if configured in pull, but I've never run them on any rig more than 800RPMs - for this spin rate they are simply unbeatable =)

I'm thinking about Server fans from their line just to see how would they perform on the same RAD (haven't made my mind but I MoRa is very tempting..) from lower to highest RPM - their pressure is insane (but I believe the noise too..but it's good to have such capabilities in case You rig would freak out & loads of heat should be removed fast =)

[smicha]

I'm thinking about Server fans from their line just to see how would they perform on the same RAD (haven't made my mind but I MoRa is very tempting..) from lower to highest RPM - their pressure is insane (but I believe the noise too..but it's good to have such capabilities in case You rig would freak out & loads of heat should be removed fast =)

This is also my concern - that is why I took only one for tests. I'll post results tomorrow or so.

[glimpse]

This is also my concern - that is why I took only one for tests. I'll post results tomorrow or so.

looking forward! =)

[smicha]

After some noise levels tests with SanyoDenki fans (industrial grade) I was just about to get the 1500RPM version but its specs (9S1212L401) was similar to the be-quiet bl062 silent wings 2 model. BTW SanyoDenki comes with bare cable, even without 3 pin connectors. I decided to go back to be quiet fans - I had 4x140mm of them at 560 rad. I was so positively surprised that BL062 are almost inaudible at 1500RPM. Their static pressure is lower (1.6 vs 2.6mm H2O in Noctua NF-F12) but at 1500 RPM Noctuas were so loud I had to keep them at lowest RPMs and loose so much of their cooling power.

So Noctuas are sold and replaced with be-quiet fans. Currently I managed to get 3 pcs, waiting for another 9x120mm to get push pull setup (4 will go for the case ventilation).

I've turned them on at max speed and there is silence. They have great sleeved cables, rubber rings from top and bottom, two mounting systems. When turned down below 1000 RPM I have to make sure that they are spinning - complete silence.

More updates soon.

[glimpse]

nice! Love photos of this build log! =)

You got me interested in those fans again..I wasn't looking anywhere since I found Noctuas, but some of Your findings are interesting to keep an eye again! looking forward for other metrics: like temperature under load with PushPull configuration! =)

[smicha]

Thanks Glimpse. By the end of next week I should get them all. I am also planning to get next 4x140 for push pull for the 560 rad. 20 fans overall