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 Post subject: Test Report: Apogee GTZ vs Koolance 350AC vs HeatKiller 3.0
 Post Posted: April 2nd, 2009, 11:23 am 
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Joined: January 24th, 2007, 4:35 pm
Posts: 258
Location: Lakewood, CA
I had previously asked Stephen to conduct an informal set of tests on our scientific bench in order to compare the Apogee GTZ to the Koolance 350AC. Since there appeared to be some disconnect between our tests and user reports on the Xtremesystems forum, I decided to redo the tests myself. Our scientific bench was also commented by some of their members as being too distant from an Xtreme user setup; so I set out to use the “Xtreme User bench” that we have in the lab. I call it Xtreme user, because it is in fact quite close to what many of the top dogs use around here: (2) triple MCR320 rads, and (2) MCP655 pumps (vario at 5). The fans are our standard RDM1225S running at 12v, and specified for 81.3 CFM’s.

Finally, since the HK3.0 recently became available in the US, I decided to also include it in the round-up.

Here is a picture of the “Xtreme” setup:

Image

Note that we use a Meanwell S32012 to power up pumps and fans; that way all we need to do is flip a wall switch to start cooling  - The Meanwell is calibrated at 12v. We also use non-spill quick-disconnect fittings. Flow restriction is notable, but convenience is priceless in a lab environment.

To capture the temps we use a Fluke 2180A RTD digital thermometer for the coolant accurate at +/- 0.01 ºC, and a 2190A for air, accurate at +/- 0.1 ºC.


Image

Image

Image

Now to the testing.

System hardware:
Motherboard: Asus Rampage 2 Extreme
CPU: Ci7 920 overclocked to 4095 MHz at 1.392v, Intel Turbo mode enabled, HT enabled
Full-cover water-cooled GTX285 in series with the GPU
Apogee GTZ: picked at random from our inventory
Koolance 350AC: purchased retail.
HK 3.0: purchased retail.

Testing protocol:

3 mounts for each block, using Arctic Lumiere for thermal compound, which is a laboratory grade of Arctic Ceramique.

The systems were allowed to ramp up to stable coolant temperature.
CPU, ambient air and coolant temperatures were recorded every minute on the minute for a period of 10 minutes using RealTemp 3.0

CPU load was applied using 8 threads of BurnK6.

GTZ system setup


Image

350AC system setup


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HK3.0 system setup


Image


INSTALLATION:

Apogee GTZ:
Nothing to report other than painless and repeatable.

Koolance 350AC:
User is required to estimate how much spring tension to apply. To make sure that I had an absolutely even mount at all 4 screws, I measured the distance between thumbnut and hold-down plate and made sure that it was identical at all four screws within 0.1mm (0.004”). The tension to the springs was the maximum I could apply with my fingers.


Image

HK3.0
No back plate is supplied with the block. Users are required to precisely measure each spring height, using similar technique to the above; a height table in mm is provided. Recommended spring tension of 20Nm was used for the test.


Here is a summary of the test results. The complete spreadsheet is available for download here: http://www.swiftech.com/ASSETS/IMAGES/PRODUCTS/GTZ%20VS.%20350AC%20VS.%20HK3.0/GTZ,350AC,HK3,0-results.pdf
Note that all individual CPU temps show 1 decimal, as they each represent the average of 9 measurements. Air and coolant temps are also the average of 9 measurements.


Image

Note: where “∆” stands for Delta, and is meant as “difference”

OBSERVATIONS AND CONCLUSIONS

Given the precision of the CPU DTS (+/- 1ºC) these test results are accurate at +/- 1ºC. We can observe that GTZ and HK3.0 are tied, and that 350AC is visibly trailing behind.


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 Post subject:
 Post Posted: April 2nd, 2009, 6:26 pm 
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Joined: April 2nd, 2009, 6:07 pm
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Location: Cottage Grove, MN USA
Excellent write-up and testing Gabe! It will be hard for the system to be argued against, but I am sure some will find a way as they always do. Did you order the HeatKiller from here in the states? I can't get my hands on one or their official backplate...everyone is sold out.

I have been using nearly the same method for spring tension on the blocks that use springs with no stop mechanism. Its the only way to be certain that you have equal mount pressure at all four corners. CPU block testing is the most time consuming set of tests out of them all, especially when during the week I can only get 1 or 2 mounts done per night.

For my own clarification, your Air ºC is radiator intake temperature, correct?

Again, excellent work.

_________________
skinnee labs test schedule:
In Testing: LGA1366 Shootout (9 CPU Blocks)
Writing Reviews: HWLabs GTX360, TFC360, MCR320 Stacked
Hunting down Tops: DDC Top Round Up (Have: EK V2, XSPC, XSPC Res top)
After i7 Tests: LGA775 Finale (11 CPU Blocks)


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 Post subject:
 Post Posted: April 2nd, 2009, 7:25 pm 
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Joined: January 24th, 2007, 4:35 pm
Posts: 258
Location: Lakewood, CA
skinnee wrote:

For my own clarification, your Air ºC is radiator intake temperature, correct?

Again, excellent work.


yes, that's the pic above where3 you see the probe fastened to the fan.


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 Post subject:
 Post Posted: April 2nd, 2009, 9:54 pm 
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Joined: April 2nd, 2009, 6:07 pm
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Location: Cottage Grove, MN USA
got it, thanks!

_________________
skinnee labs test schedule:
In Testing: LGA1366 Shootout (9 CPU Blocks)
Writing Reviews: HWLabs GTX360, TFC360, MCR320 Stacked
Hunting down Tops: DDC Top Round Up (Have: EK V2, XSPC, XSPC Res top)
After i7 Tests: LGA775 Finale (11 CPU Blocks)


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 Post subject: #subject
 Post Posted: March 12th, 2011, 4:42 am 
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Joined: March 11th, 2011, 9:22 am
Posts: 0
Location: United States
[quote]Excellent write-up and testing Gabe! It will be hard for the system to be argued against, but I am sure some will find a way as they always do. Did you order the HeatKiller from here in the states? I can't get my hands on one or their official backplate...everyone is sold out. I have been using nearly the same method for spring tension on the blocks that use springs with no stop mechanism. Its the only way to be certain that you have equal mount pressure at all four corners. CPU block testing is the most time consuming set of tests out of them all, especially when during the week I can only get 1 or 2 mounts done per night. For my own clarification, your Air ?C is radiator intake temperature, correct? Again, excellent work.[/quote]
+1


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 Post subject: Swiftech Forums • Post a reply
 Post Posted: March 14th, 2011, 9:33 am 
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Joined: March 13th, 2011, 5:07 pm
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Location: United States
[quote]skinnee wrote:[/quote]
:(


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