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Dedicated folding PC - Add 2nd radiator to small pump?

post #1 of 11
Thread Starter 
Hi all,

I am in the process of building a dedicated 24/7 budget folding PC, the spec of which is below:

HDD:.........80GB ATA100 7200RPM 2MB........................£00.00 (already have spare)
CPU:.........Celeron D 335 2.8GHz.................................£32.49 (have)
M/B:.........Gigabyte GA-8IPE1000-G.............................£00.00 (already have spare)
RAM:.........Geil Value DDR400 2x256MB 2.5-3-3-6...........£37.38 (have)
Monitor:....18" Relisys CRT.........................................£00.00 (already have spare)
CASE:........Casecom KB-7760 Black ATX Midi.................£10.80 (have)
GFX:.........ATi 9550 256MB 128-bit AGP 8X...................£39.91 (have)
OS:...........Windows 2000 Professional.........................£00.00 (already have spare)
PSU:..........600W (+12v Rail = 24a) Generic..................£24.94 (have)
Floppy:.......Sony Internal Black 3.5”............................£09.13 (have)
Optical:......Samsung 16X DVD ROM Black......................£15.13 (have)
Cooling:......BigWater SE............................................£00.00 (already have spare)

Total Cost:.................................................. ..........£169.78 ($318.94 USD / $354.50 CAD)

Now, because I intend to o/c the Celly D 335 as much as possible (up to or exceeding 4GHz) I want to cool it as well as I can with what I've got. I just happen to have a spare single radiator (for 120mm fan) kicking around and I was hoping to add it to my old BigWaterSE kit, to beef-up the cooling a little.

The only problem is though, that the pump that comes with the BigWaterSE is not exactly the worlds most powerful, so I was wondering what you guys thought would happen if I added a second radiator to it's loop? I would guess the flow would slow down a bit (from 90l/h) but do you think it would slow down so much as to nullify the effect of having a second radiator?

Basically, would I get better cooling with two radiators (both for 120mm fans) but a lower flow rate, or one radiator, with a higher flow rate? I'm hoping the addition of a second radiator would off-set the lower flow rate and provide better overall cooling than with just one radiator, but what do you guys think..?

Thanks!

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post #2 of 11
I think it would give you better overall cooling.
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post #3 of 11
the fridge would probably get realy hot inide

i wanna get one of those things they have in supermarkets that they keep the veggies in that are wide open and shoot out cold air
    
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post #4 of 11
If you have a couple of the high cfm 120's laying around try them on your single rad and see if it gets your temp's down around where you want them..If it doesn't help enough add the second rad..If you have to buy fan's just try the second rad first and see what temp's it gives you..I bet that T-Take pump doesn't have much head does it?
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post #5 of 11
I would be inclined to use the 120mm radiator you have and substitute it into the Thermaltake system.
Try a push-pull configuration on the radiator core and see if that will keep the coolant temperature down with the aid of better airflow over the core.

A lower flow rate/pressue generated by that pump (as long as you are not subjecting it to further restrictions in the loop, namely the CPU waterblock) it not as bad as it seems.
You just need to have greater airflow across the fins of the heat exchanger to maximise the total loop temperature drop.
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post #6 of 11
Thread Starter 
Hmmm, so a loop like this ( reservoir >> pump >> radiator1 >> radiator2 >> CPU Block ) would most likely be better than a loop like this ( reservoir >> pump >> radiator >> CPU Block ) even if the flow and pressure are lower in the first than the second? I just need some relatively high-CFM fans, to help improve the loop's cooling capacity?

Would it help, if the radiators, pump and CPU block were (more-or-less) level with one another in terms of relative height, so there is less of a clime for the water? Would that help at all..?

Thanks for your responses btw .

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post #7 of 11
I don't think you should ad the 2nd rad into the loop. sometimes adding another rad can decrease performance when you have a better loop, and since you're already wondering it probably wouldn't be a good idea. That celly shouldn't get too hot anyway...

I'd consider getting a different psu though. Newegg has an FSP 450PN 450w psu with dual 18a 12v rails. It would be much better then the 600w generic one you were looking at, and it should be about the same price. ($50USD)
http://www.newegg.com/Product/Produc...82E16817104954
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by soloz2
I don't think you should ad the 2nd rad into the loop. sometimes adding another rad can decrease performance when you have a better loop, and since you're already wondering it probably wouldn't be a good idea. That celly shouldn't get too hot anyway...

I'd consider getting a different psu though. Newegg has an FSP 450PN 450w psu with dual 18a 12v rails. It would be much better then the 600w generic one you were looking at, and it should be about the same price. ($50USD)
http://www.newegg.com/Product/Produc...82E16817104954
Already bought the PSU. I have had one before, running a P4 Prescott 3GHz @ 3.6GHz in socket 478, with my X800Pro. I would guess the power requirements for the Celly D (and 9550) would be less than the Prescott and X800Pro, so I think it'll be OK. I wont be running much hardware on this budget rig, as you can see from my first post, so I'm fairly certain the PSU will be able to cope, hopefully .

I think I'll just have to test the system with one and then two radiators and see which config gives better performance. I'm still not sure what configuration will be best, so I guess the only way to know for sure is to test it... I'd buy a replacement pump, but even used pumps are pretty expensive on this side of the pond and this rig has to stay a budget one. You'd think a basic pump with 180l/h+ would be easy to get for £10.00 or £15.00 ($19 - $29 USD) used, but evidently not .

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post #9 of 11
I think I'll just have to test the system with one and then two radiators and see which config gives better performance. I'm still not sure what configuration will be best, so I guess the only way to know for sure is to test it... I'd buy a replacement pump, but even used pumps are pretty expensive on this side of the pond and this rig has to stay a budget one. You'd think a basic pump with 180l/h+ would be easy to get for £10.00 or £15.00 ($19 - $29 USD) used, but evidently not .

Highly-Annoyed[/QUOTE]
That is what I would try to start with, then go from there..Wow, I feel for you, those are some crazy high prices on hardware y'all have over there...
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post #10 of 11
Thread Starter 
OK, just to let anybody know, who may be interested, I tested the system with one radiator and then with a second and the results were:

1 Radiator: Mean Full Load Temp of 58°C @ 3.5GHz over 1 hour.
2 Radiators: Mean Full Load Temp of 52°C @ 3.5GHz over 1 hour.

The pump I'm using (as mentioned) is an old 90 Litre p/hour pump that came with my old BigWater SE kit. Even though I would guess the actual flow rate has dropped somewhat as a result of adding a second radiator, clearly the performance hit from lower flow has indeed been off-set by the increase in cooling surface area, resulting in lower overall CPU temps.

Hopefully, when the AS5 I applied has cured and I have the vast majority of the air out of the system, I can expect even lower temps, which should lead to a higher o/c too .

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