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Is 4 pumps a overkill - Page 3

post #21 of 36
Quote:
Originally Posted by ComradeNF View Post

What the hell are you cooling with all of that? 3 full size server racks or something?

a nuclear reactor biggrin.gif
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post #22 of 36
Remember that the way a water cooling system works is the liquid pumps through channels cut in top of the contact plate of the water block, The liquid then flows through these channels soaking up the heat that's being transferred to the plate, and then removing it as quickly as possible. Depending on the channel type of your water block there will be a certain amount of resistance, Meaning you will only be able to pump liquid so fast through the block, Hence the pressure build up, So even if you put a thousand pumps on your system it will all be bottle necked by your water blocks.

Now the other thing to remember is that liquid is meant to make timely contact with block therefore absorbing heat as it moves through, If it moves through the block to fast it wont get the chance to absorb the heat leading to higher temps, but if you pump the liquid to slow it will begin to heatsoak and wont be able to absorb as much heat because the heatsoaked liquid will still be in the water block for to long, and wont be removing enough heat. There is a certain speed you wish to obtain to get maximum heat dissipation. If you got to high or to low you wont be getting your best temps. Id suggest starting small and working up much like an Overclock. I'd try 2 strategically placed pumps first, Or even 1. Check your temps then compare to similar setups and add another if needed...You can still buy all the pumps and keep the others as backups/use for other builds..
     
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post #23 of 36
Thread Starter 
I plan to cool and run 3 gpu(nvidia next gen cards when ther release) , I also plan to run a asus r4e board with intel i7 3930k, plan to carol the ram,and board also that's why I'm getting 4 rads 2 480rx,and 2 360rx. So my question to u guys is should I stick with two loops or a single loop. Loop 1 cpu,ram,board. Loop 2 3 gpu. Do I need all those radiators ,and shoul I get mcp 35xx over d5.
post #24 of 36
Personally I prefer the 655 to the 355 for noise and durability. The 655 will run cooler and is just plain heavier, the ones I have have been runnning for 2 years without issue. I would suggest one loop with the pumps in series. I You'll have plenty of radiator overkill for all those components, and I would suggest dropping the ram blocks and possibly the mobo blocks too since they'll add lots of restriction compared to the other components and probably not help those parts in any significant way. I would suggest 480 + 480 for those GPUs as absolute max needed and then a single 360 to handle the CPU, and that second 360 will pick up the slack where needed.
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post #25 of 36
I've gone the other way and now prefer the 35X to the 655. Although the 655s are reasonably quiet they still whine a bit at full speed, especially in series, and if they're hard to get to then it's difficult to adjust the speed. I prefer the 35Xs as the majority of the time you can run them at minimum settings where they're virtually silent and then ramp them up to higher speeds via PWM under load.

I like bling as well as cooling performance so I've got RAM and mobo/mosfet blocks in my setup and 2 x 35X easily handle them even running both at about 1600rpm and under full load with the fans at 5v (note I am overradded).
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post #26 of 36
They both have fan clubs biggrin.gif I like the D5s because they don't have the overheating issues that the 355s sometimes have, and they're natively 1/2" ID. The PWM control is nice on the 3xx but I've never had issues with the D5s maxed out so it hasn't been an issue. I guess if I was looking to economize and work the power-savings angle it would be worth considering, but I fold 24/7 so I'm usually running them flat out all the time. The other tradeoff is that the D5 is a good performer with the stock top, where the 35() really needs a top to be a good contender and needs a top to support 1/2 ID tubing without some sort of adapter setup- that's what usually balances the price in my mind, stock D5 vs 355 + top.
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post #27 of 36
4 pumps too much? No way, go with 8.
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post #28 of 36
Quote:
Originally Posted by JedixJarf View Post

4 pumps too much? No way, go with 8.

1 for each core? xD. or how about just doing a octaloop?thumb.gif
     
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post #29 of 36
Quote:
Originally Posted by dekciW View Post

Now the other thing to remember is that liquid is meant to make timely contact with block therefore absorbing heat as it moves through, If it moves through the block to fast it wont get the chance to absorb the heat leading to higher temps, but if you pump the liquid to slow it will begin to heatsoak and wont be able to absorb as much heat because the heatsoaked liquid will still be in the water block for to long, and wont be removing enough heat. There is a certain speed you wish to obtain to get maximum heat dissipation. If you got to high or to low you wont be getting your best temps. Id suggest starting small and working up much like an Overclock. I'd try 2 strategically placed pumps first, Or even 1. Check your temps then compare to similar setups and add another if needed...You can still buy all the pumps and keep the others as backups/use for other builds..

This is just wrong by all accounts. I have yet to see a practical case in which a higher flowrate nets worse performance (not talking about the heat-dumped by the pumps, but by the flow itself), because at the flowrates we are talking about it doesn't. Its also the same for very low flow-rates: the problem is not the heat-buildup (rads normally don't care about flow-rate, unless its VERY low) but the fact that the lack of water speed (= turbulence) makes it very hard for the water to pick-up heat.

----

What one should take into account is that a pumps power consumption is not linear: The higher the flow-rate, the higher the power consumption, and thus its not hard to triple your power consumption just by adding another pump (assuming you had one at first...because if you had 2, it could be even worse), and this is something that needs to be thought about, or all the benefits you had because of that extra flowrate will end up nowhere because of the extra head-dump.
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post #30 of 36
Thread Starter 
will i benefit more having two loops.. temp wise over a single loop i do plan to overclock the **** out of my 3 gpu cards and cpu. if i do two loops it would look like this.... 1st loop Res>2 Pump in serial>480rx Rad>Gpu's>360rx Rad>Res... 2nd loop Res>2 Pump in serial>480rxRad>cpus>board>ram>360rxRad>Res.. still debating between mcp 655 or mcp 35xx pump..what do you guys think any more suggestion and thanks for the help guys.
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