I have a thermaltake water 3.0 240mm aio and an arctic liquid freezer 240 that had pump power failure about 6-8 months into it's life. The thermaltake has woefully insufficient flow rate to handle the 3900x at full load. Temps rise to 80C range and as soon as load drops, so does temps, instantly. This tells me that the radiator is more than adequate to dissipate the heat, but the flow rate is not. My plan is to add a second pump (modtek silence) and use the other 240mm radiator attached to the front so the loop goes like this: cpu block + pump -> orig radiator at top (exhaust setup) -> 2nd pump -> 2nd radiator (intake setup) -> back to cpu block The extra parts and all should be coming tomorrow and I should be able to test the setup before the weekend. The extra radiator might be overkill, but I have it sitting around doing nothing so why not. I've been looking at review sites and each one seems to have drastically different numbers that make it impossible to take those numbers and compare to yourself or other sites. Frostytech has test numbers that make every liquid cooler look like they're amazing with single digit or low teens above ambient with 125+ watt loads on the cpu blocks. play3r.net and whatever else we can find these days since hardocp is dead have completely different numbers (40c over ambient, etc). I'm seeing load temps of around 60C over ambient, and maybe 3-4C over ambient at idle with the thermaltake system. 50-55C over ambient when I undervolted the 3900x. meh, just curious if other real-world system uses find themselves closer to what i'm seeing or if what I'm seeing is exceptional. The thermaltake is less than a year old. I'll be doing a full cleaning and breakdown so I'll see what the state of this aio is after such a short time of use and see how the cpu block looks before replacing all the liquid with some new stuff i'll be mixing up. edit: So parts list is as follows so far: pump1 + radiator 1 = Thermaltake Water 3.0 240mm aio pump2 = modtek 17w 12v - 253.7gph , pwm controlled radiator 2 = 240mm radiator from Arctic Liquid Freezer 240 aio Hoses will stick to the aio sizes of 1/2" od 1/4"id liquid additive = primochill liquid utopia. basically this is the original build with my old 1800x and the arctic cooler before the pump died The new 3900x is essentially all the same except the arctic has been replaced by the thermaltake, new mobo and new cpu and no stupid wire tie on the gpu corner The second radiator will go in the front against those intake fans. The second pump will likely be mounted to the back motherboard tray area. Sitting between the two radiators.