EK DCP 4.0 pump : 360mm + 240mm + 240mm radiator + 2x gpu blocks + cpu block

My pump is running almost the same (two 120's rather than 240's) with no problems, its a OcUK Tech Lab - D5 Vario Pump & Alphacool Clear HF D5 Top Value Combo..
 
kerrgreg said:
yeah i wouldnt want to use that pump with all that resistance. maybe even 2 ddc's rather than the D5
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£130 on pumps, it's rather on the expensive side of things. I've just been pottering around with over clocking my gpu's, got both 5970's to 950 core and 1300 mem stable, with temps still under 40 on the gpu cores....maybe I won't add all these radiators, not to mention the fact it would mean some major case modding, or even just "hanging" the radiators to the sides with cable ties :D
 
well in my mind, the extra rads would have a negative effect if the flow rate from the pump is low due to resistance from the blocks and rad. If its not flowing fast enough then you cant get the water away fast enough the heat gets contained in the block or even the first rad and everything else in the loop is rendered a waste.
 
kerrgreg said:
well in my mind, the extra rads would have a negative effect if the flow rate from the pump is low due to resistance from the blocks and rad. If its not flowing fast enough then you cant get the water away fast enough the heat gets contained in the block or even the first rad and everything else in the loop is rendered a waste.
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I think it's mostly down to the pump and something known as the "head pressure", which as far as I understand it is the pump's ability to maintain it's flow rate under stress: As in restrictive blocks.

But with the drop in pressure from the rads, the marginal increase in pressure from the GPU blocks (and soon a CPU block) might not bring the pressure up enough for the pump to achieve a decent flow rate.
 
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