Originally Posted by DrFreeman35
EK 560 CE enough to cool 2x1080 when OC? Or should I put another 240 radiator in with it? Or go with a thicker radiator? New to this, figured someone would have some info as this is where all the 1080 users are at....
Originally Posted by shadow85
If I am to have a dedicated loop for 2x GTX 1080 STRIX, what size radiator(s) will I need if I plan on Ocing them to around 2GHz boost.
So I'm running 2x1080 SLI, one was an EVGA SC, one was EVGA FE, both are on the SC bios (just duplicated and flashed to both cards for simplicity). I'm using the EK blocks with EK bridge, CPU is also on the loop (6600K, stock), and all three are cooled with just a single 280mm radiator with EK Vardar F2 fans. I haven't spent a ton of time pushing my clocks, but the cards are easily keeping below 55c on the GPUs (that's for the top GPU, the lower GPU stays about 5c cooler) while playing GTA 5 at 4K with almost everything on very high (the shadows and grass on ultra bring framerate from solid 60 to ~45, unacceptable). I usually run between 1950 and 2050mhz on the GPUs, and even when looping firestrike ultra, the cards don't go over 55c over a prolonged period of time. The fans kick up to their 1600rpm max with this, but it's fine, it's not that loud, and my setup isn't "optimized".
I thought I'd need much more radiator, but I'm pretty pleased at the performance I'm getting with just 280mm on CPU+2GPUs. The die shrink is real! Hopefully this helps people wondering how much radiator they need. I would recommend my setup at minimum, I wouldn't go smaller than 280/360mm for CPU+2GPUs, but I can see where CPU+GPU or just 2 GPUs you could get away with 240mm without much problem.