Need some help with temps

radix · Feb 6, 2011

So here goes the first post.

I have a machine with 7 EVGA GTX 580 SC's being watercooled. The water blocks are made by AquaComputer. It is a parallel system so each card is supplied "cool" water from the same inlet. I am using an MO-RA3 9x120 radiator and an eheim pump @ ~55lph. Idle temps on the graphics cards is about 20c, but under extended load this creeps up to 65-70c. Since this machine needs to run for long periods, I am looking for a way to lower these temps. There are a couple factors to take into account:

My ambient temps RARELY drop below 70F, and regularly are above 80F. Humidity is generally around 55-60%. This makes it difficult to effectively cool this system.

So far I have had a few suggestions, and ideas. I thought of using an aquarium water chiller, hacking up a chilled water dispenser, and encasing the radiator in a styrofoam chest filled with dry ice, and replacing the 9x120mm fans with a 2000 CFM automotive radiator fan. Problem is, I don't know what would work best.

Radiator:

PC:

Individual card:

TIA

spitter3 · Feb 6, 2011

Your flow rate is absurd for 7 580s you need at least 7 gallons of water per minute thru that parallel link to take out the watts your putting into those blocks!!

QuietIce · Feb 6, 2011

to OCF!

Assuming that's ~55lph per block it's a very low flow rate. Typically, water blocks need at least four times that much flow to create enough turbulence inside the block for effective heat transfer - so that's part of the problem. Stepping up to a Swiftech MCP-655 (or Laing D5 - same thing) should help a lot but even that's a little short of what you need for optimal performance. A pair of them in parallel would be best.

The other part is getting rid of the heat once it's in the loop. Your rad area is a little low for that many blocks but not by too much. Increasing airflow will offset the lack of rad area. Using the automotive fan should work well, though I'm sure it will be terribly loud.

Rotary · Feb 6, 2011

OMFG Holly SH*t lol, thats one nice build

Conumdrum · Feb 6, 2011

More pump for sure. If it's only rated at 55 lph with no restriction, you should have poor flow, not good to start with. Typically seeing what your temps are doing over long periods you have heat saturation, meaning your cooling device isn't big enough. Better fans might help a lot, at the expense of noise.

You have over 1400 watts of heat to remove, you don't have enough radiator/fans to do the job.

65-70C for those cards isn't a problem though, they will run fine like that.

m0r7if3r · Feb 6, 2011

More pumps...I think parallel on the pumps might actually be the way to go here since restriction is low so you can do with higher flow...on a completely unrelated note :drool:

what does this get used for?!?!

Rotary · Feb 6, 2011

maybe he plays space invaders on it, million fps lol

moocow · Feb 6, 2011

Needs more rad+ pumps

radix · Feb 7, 2011

Alrighty then. I'm a little weary of using swiftech pumps as I have had 2 of them burn out on me within a week (brand new ones). Any other suggestions?

As for its use......its a password cracking box used during penetration testing.

Conumdrum · Feb 7, 2011

Well Swiftech pump are the absolute leaders. Few, very few failures vs what is sold worldwide. They are Laing pumps by manufacturer. You could get a better one of the brand you have. I know of one, but can't find a store link quickly that would work. It's 115VAC or 220 VAC, don't know if your in a 220 VAC country. I bet you never turn the PC off crunching. The pump I'm thinking of is a higher wattage, so heat dump from the pump comes into play.

Sorry to say, but Laing pumps are the best you can get, high flow, high head pressure, very low failure rates.

Still, temps maxxing at 70C with that radiator sounds about right at the higher ambients. And 70C isn't bad at all, way below bad temps and a heck of a lot quieter than the stock cards.

Tell us more about your fans. This is your best choice right now. Hopefully the link you provide to the EXACT fans will tell us something. Maybe you haven't got the quality fans that would help.

radix · Feb 7, 2011

These are the fans currently connected to the radiator:

http://shop.aquacomputer.de/product_info.php?products_id=1366

Via the control unit, they run at 100% (about 1200 RPM) all the time.

Conumdrum · Feb 7, 2011

Wow on line same time, Las Vegas for me, you?

radix · Feb 7, 2011

haha, Japan, bout 9pm

Saaby900t · Feb 7, 2011

I Did a bad thing in my shorts when I seen this monster.

radix · Feb 7, 2011

Saaby900t said:
I Did a bad thing in my shorts when I seen this monster.

Kinda the general reaction. I hate asking questions but the "can I SEE what you are talking about" always comes up. For what it was built to do, its amazing. It does full 9 char space in about 3 hours (thats every possible combination from 1 - 9 characters). So if you have a 9 char password, consider changing it

Conumdrum · Feb 7, 2011

Wow, that doesn't tell me anything, not a fan I know at all. Looking at the smallish fins, the probably have very very little pressure to push the air through the rad. Most manufatctures, unless a very expensive indistrial fan pretty much lie with their numbers. Any review sites in EU you can find real data on them?

1200 RPM is low for a poor pressure fan. The pic I found shows very thin blades with much open space. Usually meaning poor pressure.

I'll point you to a few links after some USA popular fans.
Scythe Gentle Typhoon GT 1850 RPM AP 1850
http://www.sidewindercomputers.com/scge120mmsic2.html
Yate Loon High speed 2000 RPM
http://www.sidewindercomputers.com/yalo12d1hisp.html See the DBA diff? These are true numbers. Your fans can't be very good in moving air. Cheap too.

Can you get them? Don't know.

Links
http://www.xbitlabs.com/articles/coolers/display/120-140-fans-roundup_28.html#sect0
http://www.madshrimps.be/articles/article/936/0
http://www.overclock.net/air-cooling/724577-well-dressed-megahalems-65-fans-112-a.html

Ohh many watercooling linksss..
http://www.overclockers.com/forums/showpost.php?p=6489396&postcount=3

Your radiator link, can be found in German. Pay CLOSE attention to the fans used.
http://www.xtremesystems.org/forums/showthread.php?t=265722&highlight=mo-ra

radix · Feb 7, 2011

Conumdrum said:
Wow, that doesn't tell me anything, not a fan I know at all. Looking at the smallish fins, the probably have very very little pressure to push the air through the rad. Most manufatctures, unless a very expensive indistrial fan pretty much lie with their numbers. Any review sites in EU you can find real data on them?

1200 RPM is low for a poor pressure fan. The pic I found shows very thin blades with much open space. Usually meaning poor pressure.

I'll point you to a few links after some USA popular fans.
Scythe Gentle Typhoon GT 1850 RPM AP 1850
http://www.sidewindercomputers.com/scge120mmsic2.html
Yate Loon High speed 2000 RPM
http://www.sidewindercomputers.com/yalo12d1hisp.html See the DBA diff? These are true numbers. Your fans can't be very good in moving air. Cheap too.

Can you get them? Don't know.

Links
http://www.xbitlabs.com/articles/coolers/display/120-140-fans-roundup_28.html#sect0
http://www.madshrimps.be/articles/article/936/0
http://www.overclock.net/air-cooling/724577-well-dressed-megahalems-65-fans-112-a.html

Ohh many watercooling linksss..
http://www.overclockers.com/forums/showpost.php?p=6489396&postcount=3

Your radiator link, can be found in German. Pay CLOSE attention to the fans used.
http://www.xtremesystems.org/forums/showthread.php?t=265722&highlight=mo-ra

Doesn't matter where I buy from. Fans aren't that expensive and if they need to be changed I'm all for it. 70C is the running temp on the cards NOW but we are coming to the close of winter here, and soon it will be like living on the taint of a 600 pound man in the Sahara summer.

Conumdrum · Feb 7, 2011

Okay, dig in. The best fans for the noise is the Scythe GT's. Made by Nidec. Maybe Japanese, maybe Korea. You CAN find them there for sure.

They are a bit louder, but they have such a pleasing noise level mentioned by many. Still. personal perference.

And that would be the same temps as the same man standing in Finland during the winter. Physics always wins, a 600 man always has the taint covered in fat rolls..... Your sick! LOL!

radix · Feb 7, 2011

Conumdrum said:
Okay, dig in. The best fans for the noise is the Scythe GT's. Made by Nidec. Maybe Japanese, maybe Korea. You CAN find them there for sure.

They are a bit louder, but they have such a pleasing noise level mentioned by many. Still. personal perference.

And that would be the same temps as the same man standing in Finland during the winter. Physics always wins, a 600 man always has the taint covered in fat rolls..... Your sick! LOL!

Noise isn't really an issue. I have a rack of servers next to this thing I have gotten used to fans whirring all the time. Hell, when the cards ramp up and the PSU's are draining the worlds power supply, it sounds quite similar to an F-16 taking off.

Conumdrum · Feb 7, 2011

Okay! Lets try the fan first, but you should look at a better pump later. Or sooner.

F-16? I know them, I'm retired AF. Old F-4 guy, watched the Lawn Darts launch all the time.

Need some help with temps

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