Gtx 980 liquid cooling help

Solution
https://www.ekwb.com/configurator/ = https://www.ekwb.com/shop/ek-fc980-gtx-nickel minimum flow rate is 0.5GPM, should be fine with XSPC Ion + 140mm rad, your GTX 980 is reference PCB design with ~ 60-70% ASIC, any 140mm rad + 140mm fan@ 1000RPM dissipate ~ 180 watt, if do mostly GPU rendering (Octane, Furryball, V-Ray, etc) then you're on the right track opting GPU water cooling, for gaming the price you'll pay can be allocated for better case fan, if you cool CPU+GPU in a single loop then minimum rad is 320mm@1000RPM (three 120 fan), assuming 180 watt GPU TDP + 160 watt CPU TDP.
https://www.ekwb.com/configurator/ = https://www.ekwb.com/shop/ek-fc980-gtx-nickel minimum flow rate is 0.5GPM, should be fine with XSPC Ion + 140mm rad, your GTX 980 is reference PCB design with ~ 60-70% ASIC, any 140mm rad + 140mm fan@ 1000RPM dissipate ~ 180 watt, if do mostly GPU rendering (Octane, Furryball, V-Ray, etc) then you're on the right track opting GPU water cooling, for gaming the price you'll pay can be allocated for better case fan, if you cool CPU+GPU in a single loop then minimum rad is 320mm@1000RPM (three 120 fan), assuming 180 watt GPU TDP + 160 watt CPU TDP.
 
Solution
This previous comment might confuse you because it is so specific. The second link he has there is an EK waterblock for your card. If you go this route, you will remove the stock cooler and put on the block which is fairly easy if you follow directions. At that point you have only a block. You will need fittings, tubing, radiators, a pump and a reservoir to complete your loop which may end up costing more than the card itself nowadays. All those parts can be purchased on EK's website if you need to go that route.