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How much rad does a 7970 require?

post #1 of 10
Thread Starter 
Okay I built a water cooled rig awhile back when heater cores and aquarium pumps were still cool. biggrin.gif I've been out of it since then, but I really need to move the heat of my 7970 out of my bedroom. Eventually I will properly water cool the whole system, but for now, what kinda surface area should I be looking at to just keep the 7970 at a safe temp at an ambient of 65-70? It folds 24/7, hopefully I will move that over to my 6850 eventually, but for now I will be using the 7970 and roommates aren't amused paying the electrical bill (w/ electric furnace) when its 20*F and my window is open. rolleyes.gif

For now, no overclock on the card, just looking to get enough rad to cool the card under 100% load.
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post #2 of 10
I wouldn't use less than a 240mm rad of any thickness for a 7970. Since you plan on adding others to the loop, I would start with a 360 if you can fit it anywhere.
 
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post #3 of 10
Thread Starter 
Cool thanks, I'll look into it. FWIW I'm not concerned about whatever surface area I get now cooling the proc, etc. I will be reworking the whole thing when I have the funds to WC the whole system. I'm purely concerned with moving the heat from the 7970 right now.

Also, system is caseless for now, case + legit w/c setup will happen at the same time.
Edited by FastCR - 2/11/12 at 12:01am
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post #4 of 10
To be honest you could probably get away with a decent 120mm if you wanted. Temperatures would not be great, but still a lot better than the stock cooler. According to Skinnee's test the RX120 with ~1800RPM fans should be able to handle the ~280W load with a water - air delta of <15°C:

RX120_HeatLoadChart.jpg


Having said that you are probably better off with a 240, especially as something like the MCR220 is only a little more costly than the MCR120.
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post #5 of 10
120mm isn't realistic unless you are deaf. I'm with the butcher, 240 is good.
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post #6 of 10
Quote:
Originally Posted by tsm106 View Post

120mm isn't realistic unless you are deaf. I'm with the butcher, 240 is good.

WAT???!!!

thumb.gif
 
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post #7 of 10
Quote:
Originally Posted by FastCR View Post

Okay I built a water cooled rig awhile back when heater cores and aquarium pumps were still cool. biggrin.gif I've been out of it since then, but I really need to move the heat of my 7970 out of my bedroom. Eventually I will properly water cool the whole system, but for now, what kinda surface area should I be looking at to just keep the 7970 at a safe temp at an ambient of 65-70? It folds 24/7, hopefully I will move that over to my 6850 eventually, but for now I will be using the 7970 and roommates aren't amused paying the electrical bill (w/ electric furnace) when its 20*F and my window is open. rolleyes.gif

For now, no overclock on the card, just looking to get enough rad to cool the card under 100% load.

You do realize, that a water loop isn't going to magically make the 7970 put out any less heat, right? You're still disapating the same exact amount of heat into the room. It'll just run quieter, and the core will be cooler. It'll still be the same EXACT amount of heat radiating into the room.
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by GingerJohn View Post

To be honest you could probably get away with a decent 120mm if you wanted. Temperatures would not be great, but still a lot better than the stock cooler. According to Skinnee's test the RX120 with ~1800RPM fans should be able to handle the ~280W load with a water - air delta of <15°C:
RX120_HeatLoadChart.jpg
Having said that you are probably better off with a 240, especially as something like the MCR220 is only a little more costly than the MCR120.

Thanks!
Quote:
Originally Posted by pioneerisloud View Post

You do realize, that a water loop isn't going to magically make the 7970 put out any less heat, right? You're still disapating the same exact amount of heat into the room. It'll just run quieter, and the core will be cooler. It'll still be the same EXACT amount of heat radiating into the room.

If the water stays warm enough to not accumulate condensation on the waterblock I'm going to hang the rad out the window, if not I'll be running it under the door into the hallway using a pump with a decent head. For now the loop won't be to run anything cooler, just to expel heat somewhere beside in my bedroom.
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post #9 of 10
An rx240 would get rid of the heat from your 7970 efficiently.
A 120mm radiator, even if it's an XSPC rx120 just won't be enough to cool a 7970.
post #10 of 10
To OP http://www.silentpcreview.com/forums/viewtopic.php?f=27&t=61412&p=532337

Cooling a GTX 580 with HWLabs Black Ice SR-1 120 radiator and Nexus 36.87 CFM / 120mm 1000 RPM fan.
Edited by a11an - 2/11/12 at 5:22am
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