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What about head (not that kind )?
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So we're talking about blowjobs?!
OMFG he's right! This is exactly what everyone wants to know. Wow, it doesn't seem so complicated, usually.
Ok, expanding on what Bigben2k said, it's just not that simple. Tubing is not important at first, as it depends on your block and radiator.
First, the pumps.
http://www.ocforums.com/showthread.p...highlight=pump This shows how head and flow work together. The high pressure pumps GENERALLY do better, but if you've got no flow (cooligy) then your pressure goes to waste. Pressure overcomes restriction that is caused by flow. Pressure is GENERALLY more important than flow, but if you'll look at 8 (high flow, lowish head) and 5 (lowish flow, high head) you'll find that they intersect at the block pressure/flow curve, so performance is equal. Pump heat should obviously be low, but I don't think it should be your main concern. Using the pumps that we use, the heat does not become too much.
Single pass does not come small. That's all there really is to it, unless I'm mistaken. 9 3/4" * 5 3/4" is the smallest, I believe. The pressure drop of a two pass heater core is about 3" @ 1GPM (nothing, depending on the block) A chevette core is better than a BIX because it is larger, and I believe it has a higher fin density. It is also cheaper. BIX's and Thermochills are made for PC radiators, and they'll fit better than a heater core (more than twice the price, and less than half the performance...) A shroud is really good, as it directs flow everywhere on the core, reduces backpressure, and generally increases flow. The recommended size is 1.13" A push/pull fan setup is obviously the best, and the other two options should be equal, or close enough that we can't measure.
Pumps provide pressure through a system. Pressure drop is the lowering of that pressure, so the pump can not overcome resistance as well. Pressure drop is a "square relationship" to flow, which means that pressure drop is x(y^2), "x" being the pressure drop at a certain flow, and "y" being the current flow. So, if the pressure drop is 12" at 1.5GPM, it will be 48" at 3GPM, because 12(2[twice the flow]^2) equals 48. The pump graph I linked to shows this as well. If you choose a restrictive block (MCW6000 comes to mind first) the pressure drop of your tubing and radiator matter MUCH, MUCH less. If you choose a Maze 4, however, and couple that with 3/8" tubing, your flow will drop like a stone. Remember, resistances add up, and 5' of 1/2" tubing will offer 2" of drop, while 5' of 3/8" will offer 6". A heater core offers ~3". 3" plus 3.3" for the Maze 4, plus 2" will offer 8.3" of resistance at 1GPM, meaning high flow. Using 3/8" tubing, however, offers 12.3" at the same flow. The flow will drop by a lot. However, using a WW (20" of drop) a heater core, and 1/2" tubing will offer 25", and using 3/8" will offer 29". Not a large percentage difference there, and so it probably won't affect your performance very much.
GPU and NB blocks are a lot like the tubing. With a WW, they won't affect your flow by very much, but with a Maze 4, your flow is reduced drastically. Low resistance is almost always better in these cases, as the purpose of your cooling system is primarily your CPU, and then your GPU. The NB should either be aircooled, or you can put a Maze 4 NB block on that.
Anything can remove the amount of heat anything puts out, except a lot of things are bad at it. The radiator is assigned a thermal resistance rating in degrees Celcius per watt, so for every watt that is put in, the temperature will increase. A heater core offers a thermal resistance of ~0.024C/W, and a CPU offers around 100W. 100W*0.024C/W equals a 2.4C increase in temperature. A GPU offers around 30W, and a NB 10W. They won't affect your water temperature very much.
The CPU block choice remains the same in either situation, as that is your primary coolee.
I don't really know about the reservoir thing, but I remain adament that it won't affect performance very much if at all.