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6990 + 6970 Trifire cooling

post #1 of 14
Thread Starter 
Just upgraded my eyefinity setup to a 6990 + 6970 (p67 Board didnt save enough room for 3x 6970's =/ ).

For cooling, im thinking of buying single gpu blocks, as i can get them (EK Supreme VGA) for around $30 a piece (compared to AUD$120+ for full cover) and just buying VRAM etc heatsinks. (Haf 932 w/ fans everywhere lol).

Now, the 6970 is fine, and ive already worked out how im going to do its role in the loop, but with the 6990 having full cover blocks costing AUD$180+ i was thinking of using 2x EK Surpeme's on the same card.

Pump/Res => Rad => 6970 => 6990Gpu1 => 6990Gpu2 => Pump/Res

Would this work? I havent been able to get confirmation on the 6990 mounting holes, but they look identical to the 5970 spacings (from the gpu to the hole) in which the EK supreme VGA is compatible.

Im already running a custom CPU loop with XSPC and swifttech parts, so ill probably do the same with the GPU loops bar the blocks.

Thanks
post #2 of 14
if you have your HD6990 first and use a Y splitter to have the water half and go through both GPU cores at the same time then a Y splitter to bring the tubing back to one tubing and to the HD6970 id imagine it may work better since the water wouldnt get as hot (kinda only gets heat from 2 GPU cores not 3 cores... if you think of it as the HD6990's cores heat the water to 40*C each having water split and reach 40*C then come together it would still be 40*C compared to if you passed the 1st core on the HD6990 and it got to 40*C then went to the other and would raise up to 50*C to say, then to the HD6970 were it would get to 60*C say). if you get were im coming from.. tried to make as much sense with that as i could.
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post #3 of 14
here is what is most likely the most rushed and horrid drawing in the world but its good enough to get my point.

you would want a fairly good pump though, about 800lph so that there is enough pressure and movement.

but basically the idea is that 40*c water mixed with 40*c water is still 40*C so it would be a more efficient way to cool your cards. that being said, it really would only work at its best were its a dedicated graphics card loop, having a CPU before or something that would take the pressure away from the pump may cause it to have negative affects
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post #4 of 14
Thread Starter 
Thanks for the quick reply. I understand where your heading with this. All week ive been debating going back to a i7 960 (Currently using i5 2500k @ 4.8) for the pcie bandwidth, then about the 3rd card not fitting unless i fork out $500 for a new mobo... all in all, fun lol.

Im planning to run the 2 loops, both with 360 rads (XSPC Rasa). I can run one of the 6970s on my cpu only loop, and the 2 other gpus on the seperate loop?
You idea of a Y piece is actually new to me, and come to think about it, pretty smart

(How does a Y piece effect flow rates?)

If i do go ahead with this build, im hoping that the EK Supreme VGA blocks fit on the 6990.
post #5 of 14
if you get universal blocks that im pretty sure the EK Supreme VGA blocks are you should have no issues fitting them to a HD6990 since they cover such a large range of GPU's... in fact if it is the same hole spacing as the HD5970 then i know you can.

As for the Y splitter you would need to go to a hardware store and get 1/2" Y splitter which looks like a Y shape barb connector. http://static.coleparmer.com/small_images/3070393.jpg
just like that one pretty much.

Flow wise its just basic math, if your pump pushes 800LPH and it comes to a split off (our Y fitting) then the flow rate will half evenly as long as both paths have the same resistance. so your flow would half, thats why id suggest a good pump.

just a thought though, id look at getting two 360 rads for the GPU's if your looking at heavily overclocking them, just going off a guess since it takes 2 240 and a 360 rad to keep my i7 at 4.6ghz just below the 74*C and thats only one processor not 3... just a thought. maybe try one 360 rad but be ready to buy a second one if you need it in the end.
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post #6 of 14
I would not use GPU only water cooling blocks. You are not cooling the VRMs, which the stock air cooler and full waterblock does, so keep this in mind.
     
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post #7 of 14
Dude, why would you spend that amount of cash on cards and not get fullcovers, especially on a beastly card like the 6990?
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post #8 of 14
Quote:
Originally Posted by Kal777 View Post
if you think of it as the HD6990's cores heat the water to 40*C each having water split and reach 40*C then come together it would still be 40*C compared to if you passed the 1st core on the HD6990 and it got to 40*C then went to the other and would raise up to 50*C to say, then to the HD6970 were it would get to 60*C say). if you get were im coming from.. tried to make as much sense with that as i could.
OMG! you are spot on with the temperatures... its not funny...
Well... not the for 2nd GPU though...
Except I have went with the EK waterblocks for everything.

360RAD -> CPU -> 120RAD -> 6990GPU block -> 6970 GPU block -> NB/SB block -> Resv -> 2x MCP355 ->(go back to the beginning).

I get around 43->45->58 for my GPUs. I am guessing that the EK 6990 heats up the water alot before it hits the 6970.

My plans? Well I have 2x mosfit waterlogs going in after the NB/SB but dont have the adapters to do it yet.
Going to switch the GPUs around when I am get the adapters. Hopefully it would average out the temperatures more.
post #9 of 14
Quote:
Originally Posted by ezveedub View Post
I would not use GPU only water cooling blocks. You are not cooling the VRMs, which the stock air cooler and full waterblock does, so keep this in mind.
He said he will be doing vrm cooling. I dont see how this is a problem if it can save him around 200 dollars.
    
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post #10 of 14
Quote:
Originally Posted by xPrestonn View Post
He said he will be doing vrm cooling. I dont see how this is a problem if it can save him around 200 dollars.
Save $200? Did you read how much all the components being bought cost? You got money to build that rig and have watercooling, but skip using a proper waterblock?
     
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CPUMotherboardGraphicsRAM
Intel I7 860  Asus P7P55D-E Pro MSI ATI 6990 8gb G.Skill 1600 DDR3 (4x2Gb) 
RAMHard DriveHard DriveOptical Drive
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EK Supreme HF XSPC RC360 XSPC DDC Reservoir EK-FC6990 - EN (Nickel) 
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