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I just explained it to you in post #4. No way a single 120mm rad will be enough to keep a 390x2 cool. Too much heat.
You are correct. But if you think a 120mm rad will be enough to cool down a 390x2, then by all means go for it. I'd like to see pics of that.
The 295x2 doesn't push out as much heat as the 390x2.
Not a bad idea, but for the record the 390 (single) is already quite the heater. I would doubt the a 240mm AIO will be enough to cool the 390x2 alone.
If I remember correctly, the formula for cooling is 120mm per 100w of heat ( I may be far off). My 390 pushes out alot more than 200w of heat under heavy gaming. So I would think a 390x2 under load will push about 400w of heat (give or take). A 240mm AIO will not be enough to cool it and will be overpowered by the heatload. You're looking at a minimum 360mm rad just for the video card alone.
Looks like you're gonna need a bigger case.