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Much to gain from thicker rads?

post #1 of 37
Thread Starter 
ATM i am cooling 3x 6970 + 2600k. The rads i have are:

Swiftech MCP 320-QP / 34mm thick / cooled by 6x GT15's Push Pull
Magicool Slim 240 / 30mm thick / cooled by 2x GT15's in push
Coolgate 120mm / 60mm thick / cooled by 1x GT15 in Pull

I see about 6c difference in the water temp within the loop. If i understand this right the max difference in temps is usualy 2-3c in a loop with enought rads.

The temps im getting is not the best. With a ambient ~ 23C the gpu's are maxing out at around 57c @ 1.25v and the cpu around 72c @ 1.42v . The water temp is maxing out at around 38-39c so ~ 15c above delta, and that is a bit more than what i'm aiming for.

I have looked alot at tests of the rads that im using and they are OK, but far from the best.


The Top.
MCR320 @ 1800rpm give the following numbers:
186

Up top i have a total of 105mm so i could do Push/Pull (50mm) and still have 55mm for rads, or Push and have 80mm for rads.

I have looked at HWLabs GTX360, and i gives this numbers:
186

Overall it's able to disapate around 22% more W (190W more @ 1800rpm where i keep my fans @ load) This is with push only, i would assume that going push pull would give the GTX even better performance.


The bottom.
Looking at this review: http://www.overclock.net/t/1190800/bundymania-user-review-triple-radiator-360-roundup-16-rads-tested

We can clearly see that the Magicool 240 slim is falling behind the rest.

I have around 120mm for rads+fans in the bottom so anything up to 60mm rad should give me 10-15mm to work with.

Are my numbers all over the place or could i gain quite a lot by changing for thicker rads? If we are talking about cutting the load temp of the water with ~5C i would consider it, but anything under that and i dont really see the point.
post #2 of 37
Quote:
Originally Posted by Eggy88 View Post

I see about 6c difference in the water temp within the loop. If i understand this right the max difference in temps is usualy 2-3c in a loop with enought rads.

Up top i have a total of 105mm

I have around 120mm for rads+fans in the bottom

Are my numbers all over the place

A 6° difference in a loop is to much. 1.0° - 0.5° would be reasonable.

The tests you quote indicate they were run with a flow rate of 1.5 gpm. Are you getting anything near that?

And what are you talking about mm's? Fan performance is rated in CFMs and pressure, mm's means nothing.
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post #3 of 37
Thread Starter 
I dont have close to 1.5GPM atm, but im upgrading ATM to dual 655 so will be getting good flow with that.

The mm im talking about is the clearence for the rads in terms of thicknes and the thickness of the rads. (25.4mm = 1")
post #4 of 37
With those two rads you're comparing apples to oranges. Most, if not all thin radiators are rather cheap and some have noticeable inferior build quality compared to their thicker siblings (feser and xspc come to mind). The GTX series radiator that you posted stats of is currently the highest performing radiator on the market with phenomenal build quality while the swiftech is low end and has overall mediocre performance and quality. If you have to choose between the two it's a no brainer. The GTX for sure, but it's also much more expensive.

With attempting to cool a trifire setup or even just a 2600k you will want a thick 240 rad just for the cpu minimum for good temps. Anything less and you might as well just get a corsair h50 and call it a day. Each gpu will then "need" a thick 120mm rad area, obviously the more you have the better unless the setup gets so absurd the extra rad area actually hinders flow just enough to slow raise temps. Thin rads are generally starter type radiators. You're running at around 70% the performance of a larger one since the are actually slightly more restrictive than a thick rad since it has more channels for water to flow through as well.

You spent a good bit on ur sig rig. Get the better quality products. You will actually see the difference in temps if you replaced each on with a double thick rad (then sell the ones you have).
 
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post #5 of 37
Thread Starter 
Quote:
Originally Posted by fat_italian_stallion View Post

With those two rads you're comparing apples to oranges. Most, if not all thin radiators are rather cheap and some have noticeable inferior build quality compared to their thicker siblings (feser and xspc come to mind). The GTX series radiator that you posted stats of is currently the highest performing radiator on the market with phenomenal build quality while the swiftech is low end and has overall mediocre performance and quality. If you have to choose between the two it's a no brainer. The GTX for sure, but it's also much more expensive.
With attempting to cool a trifire setup or even just a 2600k you will want a thick 240 rad just for the cpu minimum for good temps. Anything less and you might as well just get a corsair h50 and call it a day. Each gpu will then "need" a thick 120mm rad area, obviously the more you have the better unless the setup gets so absurd the extra rad area actually hinders flow just enough to slow raise temps. Thin rads are generally starter type radiators. You're running at around 70% the performance of a larger one since the are actually slightly more restrictive than a thick rad since it has more channels for water to flow through as well.
You spent a good bit on ur sig rig. Get the better quality products. You will actually see the difference in temps if you replaced each on with a double thick rad (then sell the ones you have).

Thanks. I know im comparing apples to oranges and thats what im looking for. The rads i have atm are thin rads that i got from cheap back when i was cooling Q9650 and a GTX570. So to wrap it up:

GTX360 up top, anything else that will come close?? Will have to stay under 55mm thickness. Will the GT-15's in Push-Pull still be good? Dont want to go and change out all the fans to.


When it comes to the bottom rad i need some help from you guys:

Its mounted in a ATCS840 on the harddrive cage so the bottom of the rad is towards the bottom of the case. Due to shortage of space the 240 rad possision is quite picky.
The space from the lower fan holes to the bottom of the rad can be no longer then 1.5cm / 0.6" (1.8cm / 0.7" is the Absolute max, than would need to forced in) (See picture) If there is a drain plug on the bottom i will just drill out a hole in the case for that, but dont want to chop up the floor to fit in a rad. Other then that the top part can be as large as it has to, and the thickness of the rad need to stay below 60mm.

EDIT: Messured it up i could force in anything up to ~ 1.8cm / 0.7" from the bottom fan hole to the bottom of the rad, but thats as far as it will go.

450

Does anyone have some high end 240mm rads at hand and could messure the gap that i was talking about above?
Edited by Eggy88 - 1/5/12 at 7:08am
post #6 of 37
Quote:
Originally Posted by Eggy88 View Post

Thanks. I know im comparing apples to oranges and thats what im looking for. The rads i have atm are thin rads that i got from cheap back when i was cooling Q9650 and a GTX570. So to wrap it up:
GTX360 up top, anything else that will come close?? Will have to stay under 55mm thickness. Will the GT-15's in Push-Pull still be good? Dont want to go and change out all the fans to.
When it comes to the bottom rad i need some help from you guys:
Its mounted in a ATCS840 on the harddrive cage so the bottom of the rad is towards the bottom of the case. Due to shortage of space the 240 rad possision is quite picky.
The space from the lower fan holes to the bottom of the rad can be no longer then 1.5cm / 0.6" (1.8cm / 0.7" is the Absolute max, than would need to forced in) (See picture) If there is a drain plug on the bottom i will just drill out a hole in the case for that, but dont want to chop up the floor to fit in a rad. Other then that the top part can be as large as it has to, and the thickness of the rad need to stay below 60mm.
EDIT: Messured it up i could force in anything up to ~ 1.8cm / 0.7" from the bottom fan hole to the bottom of the rad, but thats as far as it will go.
450
Does anyone have some high end 240mm rads at hand and could messure the gap that i was talking about above?

Nothing will compare to the gtx360 with solid 1500+ rpm fans (rpm where it becomes the best performing rad). A good option over a 240 rad would be a GTX140 to take it's place. A noise blocker pk-3 fan will do quite well. Feser monster rads perform similarly, but they haven't been made in years, are impossible to find, and now close to $300 each if there's one around.
 
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post #7 of 37
Thread Starter 
OK so the top rad will be a GTX360, now for the 240. I allready have mounting for 2x120mm fans so will try to find a decent one, i think i could force a GTX240 in but not sure.

Looking at this picture
486

and comparing the other measurements and finding the ratio between IRL and drawing i can see that its around 19.2mm from the bottom fan hole to the bottom of the tank.

Would be great if ppl could suggest a couple of 240mm tanks that perform close to the GTX240, i will try to find the drawings of them myself, but i have no idea of the "top 5" 240 rads.

Thanks
post #8 of 37
Here's a chart to consider. Should help you pick a rad. Since you're using 1800 rpm fans the TFC xchanger is 2nd best, but no longer produced so a thermochill pa should work in its place.

597
 
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post #9 of 37
Thread Starter 
Ok, PA 120.2 wont work. 24.5mm fan spacing and the lower part is way to big (from bottom fan hole to the bottom of the rad)

Think i'll go with GTX360 + GTX240.
post #10 of 37
I have a 840 and I run a EK360 up top, a skinny 120 out the back and a RX240 standing upright against the drive cage w/ports on top...the 240 is a new RX from XSPC. I have blocks on my i7, both GTX 460's, and the mobo (removed the ram chip block...that was just show and hurt my flow rate)...you can cram that many reservoirs in the case in if you use a drive-bay reservoir (Koolance 452x2).

I also got a 1-2 degree drop in temps and a slight bump in GPM going to the RX240 from my kit-based EK 240. I'm probably going to also replace my 360 EK w/RX360 as well...those XSPC rads are a beast. I'll take a pic when I get home.

Since the CPU is your biggest heat element...maybe look at replacing your thermal compound...I switched to Indigo Xterme and it works amazingly well.
Edited by FuzzDad - 1/5/12 at 12:27pm
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