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Amount of Radiators before diminishing returns

post #1 of 8
Thread Starter 
Just got my case today and I was working out how much room I got in it and found out I can fit another radiator in the middle, I could put a 140.1 or 140.2 either way they will be SR1s with 1000rpm 60CFM fans in push/pull.

Cooling a hot ivy bridge and a gtx 680, I want to know if it will make a few degrees difference in temps or not.

450

518
post #2 of 8
Won't make a huge difference, probably around 1-3°C depending on the rest of your loop. Try putting your loop (or as close as you can approximate) into Martin's pump and rad optimizer for a better estimate.

Remember that although IB runs at a high temperature it uses little power. It is the power output that determines how many radiators you need, not temperature.

For example, AMD chips run cooler than Intel chips but use about the same amount of power and therefore need about the same amount of rad space.
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post #3 of 8
Thread Starter 
Well once IB overclocks it uses a lot of power 300w at 4.9Ghz 200w at 4.7Ghz 124w at 3.8Ghz.

I think the GTX 680 is like 195watts stock, throw in another 50 for good measure for a slight overclock.

I am looking at 500watts.

Putting that in to the calculator and using rough estimations playing with RPM cause I cant input my setup properly, this extra rad should get me from a 5 Delta T possibly to a 4 or maybe not even.

Seems once you get to 5 Delta T the rest is very hard to accomplish.

I dont understand how Delta T affects load temps? is it 1 degree in Delta T = 1 Degree load temp??

I am gonna go with 140.1 unless 1 degree in Delta T makes a difference around 5ish???
Edited by MaFi0s0 - 5/4/12 at 9:14am
post #4 of 8
Rad area should scale linearly with delta. So if you are atm at 5 then doubling the rad area with everything else being the same you should get 2.5. Thats not a huge gain considering that you already have pretty decent amount of rad space.
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post #5 of 8
1°C lower dT ≈ 1°C lower core temps.

Once you have hit 5°C dT the most you could theoretically drop is 5°C on load temps, realistically more like 2°C.

As you get closer to ambient you need exponetially more rads to drop the dT by the same amount.

I'm not sure that IB uses all that much power even when OC'ed, the most I have seen it draw is ~200W, at that point you hit the temperature limit under normal cooling (air or water).
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post #6 of 8
Quote:
Just got my case today and I was working out how much room I got in it and found out I can fit another radiator in the middle, I could put a 140.1 or 140.2 either way they will be SR1s with 1000rpm 60CFM fans in push/pull.

Cooling a hot ivy bridge and a gtx 680, I want to know if it will make a few degrees difference in temps or not

*snip*

518

If you aren't using lots of 3.5" HDD, you could remove the tall HDD mounting rails pretty easily (very little work required; check out this review which illustrates this fact - just a small amount of rivet removal might be needed as a last step). Then you have room for a 2x140mm radiator at the front of the case. This might make the airflow in the case little better, as you you can skip the 120mm radiator at over the motherboard and still have more cooling capacity in the system. FrozenCPU sells a system pre-modded this way....

457

I know this isn't exactly input you were asking for, but perhaps something to consider anyway?

I actually was heavily considering this case myself (a PC-V2120, right?) until I settled on the LD PC-V8 instead. I'm sure you will enjoy yours, and I hope you do a build log regardless of how you decide to place your radiators; I'd love to see how it turns out!

Good luck!
post #7 of 8
Quote:
Originally Posted by MaFi0s0 View Post

Well once IB overclocks it uses a lot of power 300w at 4.9Ghz 200w at 4.7Ghz 124w at 3.8Ghz.
I think the GTX 680 is like 195watts stock, throw in another 50 for good measure for a slight overclock.
I am looking at 500watts.
Putting that in to the calculator and using rough estimations playing with RPM cause I cant input my setup properly, this extra rad should get me from a 5 Delta T possibly to a 4 or maybe not even.
Seems once you get to 5 Delta T the rest is very hard to accomplish.
I dont understand how Delta T affects load temps? is it 1 degree in Delta T = 1 Degree load temp??
I am gonna go with 140.1 unless 1 degree in Delta T makes a difference around 5ish???

Where are you getting those power consumption numbers from? Those look more like TOTAL system power consumption.
post #8 of 8
Thread Starter 
Quote:
Originally Posted by Kallor View Post

I know this isn't exactly input you were asking for, but perhaps something to consider anyway?
I actually was heavily considering this case myself (a PC-V2120, right?) until I settled on the LD PC-V8 instead. I'm sure you will enjoy yours, and I hope you do a build log regardless of how you decide to place your radiators; I'd love to see how it turns out!
Good luck!

Thanks, I did see I could do that but I will be using those drive bays.
Quote:
Originally Posted by earthwormjim View Post

Where are you getting those power consumption numbers from? Those look more like TOTAL system power consumption.

The power consumption is from the graph here:
http://www.sf3d.fi/forum/viewtopic.php?f=14&t=50&start=10

This is the guy who delidded Ivy and debunked the TIM causes high temps myth.
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