My rig is an i5 2500k running at 5.02 ghz using a Corsair H100 set to the maximum performance setting. For graphics I run crossfire XFX 7970 DD cards with the dual fan GHOST coolers. I run the video cards at 1040/1575 using Catalyst Control Center with fans set to 100%. I need to run the fans at 100% because the auto and custom fan profiles do not keep the card cool enough to prevent lock ups. I can run the memory of the cards up to 1800 mhz if I use Sapphire Trixx software but I have never been able to get a stable GPU overclock higher that 1040. I do not think my cards allow voltage tweaking. The performance in crossfire is amazing and it lets me play 3 monitors wide at 5040 x 1050. The noise level however is distracting. I found this forum a while ago and it got me thinking about the mod. I spent a long time comparing costs and results of various liquid coolers and finally decided to buy some refurbished H100's at Frys for $89. I ordered my Trip T brackets and my EK waterblocks copper shim along with some Tuniq TX-4 paste. I eagerly awaited my packages so I could start my mod. I had to slightly modify the brackets because the counter sinks where not deep enough to allow the water block to sit completely flush with the bracket. Note: check the shim, it has a slight burr on one side. The shim should be installed with the burr side towards the graphics card to allow a perfect fit to the water cooler. For cooling the power supply and memory I grabbed some generic 92 mm fans while I was at Frys. I wanted something special but their in store selection was not the greatest for 92 mm. Before I installed the water cooling on the graphics cards I ran a baseline in Furmark. My top card would hit 92C and start to throttle GPU speed because of overheating. My lower card would hit 79C, Both were at 100% fan speed. (Thank goodness for headphones) I put the first card together and installed it. I ran Furmark at various clock speeds and my max temperature was 42C. I could not get the cards to run stable at a higher speed than I could on air but I can run them the same speeds with the H100 at its lowest setting. I then installed the second card. I played around some more and confirmed through gaming and benchmarking that I could go 1150/1700 in some tests but could not get higher than 1040/1600 to work in all my tests. (I use Furmark, 3DMark 11,13,Vantage, AVP, Heaven, Call of Pripyat, RE5, Cinebench and play BF3) I decided to not use Sapphire Trixx anymore because my cards do not seem to get anything out of it. I am now using CCC and at 1040/1575 with my H100's set at low I pass all tests and can play BF3 for hours. My Furmark temps are 38-39C. I am very happy with the results as I now have 3 H100's and a very quiet and fast system. I now need Trip T to make me a custom bracket to hold the 2 side mounted radiators and a cut out in my side panel to match.