Hey guys, I have built many systems in the past but I am now putting together a new rig in which I will be overclocking and water cooling; two things which I have never done before. I already bought the all components for my rig except for the water cooling components. I have been trying to decide for a while in how I want to do this but I am not sure in how to go about it. I was going to run 2 separate loops with different colors, having 2 separate bay reservoirs (I thought it would have a good look in the front of the case with 2x XSPC Single 5.25in Bay Reservoir (Aluminum Black Front). Then I read reviews about the coolants and dyes and how they breakdown and clog the system. I now want to go with just distilled water with some of that silver coil kill. I also was wondering if I really need 2 loops to cool my i7-930 over clocked CPU and 2x PowerColor LCS Radeon HD5870 over clocked. I will list my PC components I already have and then I will list what water cooling components I was thinking of getting. Any advice would be appreciated on whether I would be better with 1 loop or 2 and any other good ideas. My System: Thermaltake Armor Plus Full tower I7-930 ASUS P6X58D Premium 12GB CORSAIR DOMINATOR (6 x 2GB) DDR3 1600 (PC3 12800) Triple Channel -Model TR3X6G1600C8D ENERMAX REVOLUTION85+ 1050W ATX12V V -SLI Ready CrossFire Certified Modular Active PFC Power Supply AeroCool Touch 2000 Fan Cpntroller The rest are SSD, HDD, Sound card, Optical drives and typical parts Watercooling Parts I was thinking of getting: 2x Swiftech MCP655 12 VDC Pump 2x Bitspower D5/MCP655 Pump Replacement Top Version 2 Swiftech APOGEE-XT Extreme Performance CPU Waterblock Swiftech MCR320-QP Quiet Power radiator Swiftech MCR220-QP Liquid Cooler Radiator 2x XSPC Single 5.25in Bay Reservoir Aluminum Black 1 Swiftech MCB-120 "Radbox" I am not sure of the tubing. I was going to go ½ ID and 5/8 or ¾ OD. I need something sturdy so it won’t collapse from the pump intake. If I could use 1 loop for that over clocked CPU and 2 over clocked 5870GPU”S then will one of those pumps do? And then I could get the dual bay reservoir and maybe the Tygon silver tubing. If I need 2 loops then I will maybe use 2 colored tubings with UV LEDS in the case. As far as the Rads: I removed the two extra HDD racks at the bottom and putting a 220 there. The 320 I will hook to the back of the case unless any other good ideas (I will be using all the 5.25 bays). I was thinking of going with compression fittings also. Any ideas would be grateful.