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I decided that I want a large 1/2" (I.D.) Tube directly above the graphics card, this gives me a lot more flow, and will overall look cooler.
Also the northbridge doesn't really need water-cooling, as a nForce3 is capable of 800mhz hypertransport, but only runs at 600mhz, so there is a large margin of overclocking without the need for watercooling.
So now all I need to worry about is the 5950.
I have also expaned and re-designed the channel to 1/2" wide, and a little over 1/4" deep.
This gives more flow, and I greatly enhanced the flow over the GPU.
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(Image of backside of card)
Then following Bladerunners design I decided to split the flow to both sides of the card.
I choose not to change the flow pattern as I want to allow a total 50/50 split of water pressure. (Rather then having the backside DDR channel shorter)
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This creates a new problem, how to split the flow up.
(The above would be ideal but impossible to seal properly)
I have thought about simply using four 90 degree fittings, and a then a flow splitter before the card, this will probably end up being the easiest to do.