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  #1 (permalink)  
Old 21st May, 2004, 08:02 PM
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Koolance Exos Mini-Review

Here is a comparison of my Zalman copper air cooler vs a Koolance Exos liquid cooler.

I am using an AMD XP3000 333mhz CPU with Corsair TWINX 3200 Low Latency 1GB RAM and an Abot NF7 mainboard. I have a GeForce FX5900U which dumps a fair amount of hot air in to the case.

Below is the Zalman heat sink which has a 92mm fan.
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Koolance Exos Mini-Review-zalman_fitted.jpg  
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Last edited by danrok; 21st May, 2004 at 09:10 PM.
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Old 21st May, 2004, 08:08 PM
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The Koolance Exos:
Attached Thumbnails
Koolance Exos Mini-Review-koolance_exos.jpg  
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Old 21st May, 2004, 08:12 PM
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I will be comparing temperatures with the system running at stock and overclocked.

The room temperature was 19C in both tests. I will use Artic Silver 3 thernal paste for both types of cooler. In both tests the coolers were fitted to the CPU 24hrs prior to testing to allow the thermal paste to settle in.

I will be stressing the CPU using Folding@Home.

Stock settings are:

CPU core voltage is reported as 1.65v
Memory voltage is reported as 2.62v
CPU settings are default 13 x 166Mhz
NB voltage is 1.6v
Memory is Corsair TWINX1024 PC3200 at DDR333 at default timings 6-3-2-Cas2.0
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Last edited by danrok; 21st May, 2004 at 08:52 PM.
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Old 21st May, 2004, 08:33 PM
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The Exos unit is hooked up to the CPU-300 cooler which is rated for CPUs which generate up to 300w of heat. Lucky for me, I only ordered and paid for the 200w version. The supplier (http://www.tekheads.co.uk) now only stock the 300w version, so this is the one they sent to me.

The Exos uses hose with a 1/4" or 6mm internal diameter. There are various cooler blocks available for the CPU, GPU and mainboard chipset. For now, I am just using the CPU cooler.

CPU-300 block:
Attached Thumbnails
Koolance Exos Mini-Review-koolance_300w.jpg  
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Last edited by danrok; 8th August, 2004 at 02:30 PM.
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Old 21st May, 2004, 08:43 PM
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This is how the Exos looks from the rear after being fitted to my Lian-Li PC75 case. The black cable links the cooler unit to the supplied slot interface card which is in turn linked internally to the PCs power and a CPU temp probe.

You can also see the resovoir which houses two small sub-pumps. One pump pushes water in to the radiator the other is fitted to the radiator outlet.
Attached Thumbnails
Koolance Exos Mini-Review-koolance_exos_rear.jpg  
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Old 21st May, 2004, 09:42 PM
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System at stock speeds and idle.

Temps with Zalman cooler and fan at full speed:

Board: 21 C
CPU: 34 C

Temps with Koolance Exos and fan at slow speed (<45%):

Board: 25 C
Exos probe: 25 C
CPU: 34 C

Temps with Koolance Exos and fan at full speed (100%):

Board: 25 C
Exos probe: 24 C
CPU: 33 C

I am assuming that the higher board temp is due to the fact that my PSU and case fans are temperature sensitive and are running at a lower speed with the Exos unit fitted. I placed my hand at the back of the case and the fans are definately running much slower and the exhausted air is much cooler than with the regular air cooler.

The system sounds quieter and is far more pleasant on the ear than with the Zalman heatsink.

The fans on the Exos do run very quietly in mode 1 (slow). They are not quiet when switched to 100% speed, although the noise is not unpleasant. I don't think I could stand fans running full pelt on a workstation, but this mode would be good for a server in a warm room or for a PC in a very hot enviroment where cooling is more important than noise levels.
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Old 21st May, 2004, 10:25 PM
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System at stock speeds and under load running Folding@Home.

Temps with Zalman cooler and fan at full speed:

Board: 25 C
CPU: 45 C

Temps with Koolance Exos and fan at slow speed (<45%):

Board: 26 C
Exos probe: 26 C
CPU: 38 C

Temps with Koolance Exos and fan at full speed (100%):

Board: 26 C
Exos probe: 25 C
CPU: 37 C

So a good temp drop of 7 to 8 C with the Exos.
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Old 21st May, 2004, 10:57 PM
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System overclocked and idle:

CPU now at 1.79v
Memory at 1.72v
Chipset set to 1.7v in BIOS.

CPU 11.5 x 205Mhz and memory running at DDR410.

Temps using Zalman cooler:
Board: 23 C
CPU: 35 C

Temps using Koolance Exos with fans in mode 1 (<45%):
Board: 26 C
Exos probe: 26 C
CPU: 35 C

Temps using Koolance Exos with fans in mode 3 (100%):
Board: 26 C
Exos probe: 25 C
CPU: 34 C
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Old 21st May, 2004, 11:23 PM
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System overclocked an under load running Folding@Home.

Cooled with Zalman heat sink:
Board: 27 C
CPU: 50 C

Temps when cooled with the Exos in slow mode 1:
Board: 27 C
Exos probe: 27 C
CPU: 39.5 C

Temps when cooled with the Exos in fast fan mode 3:
Board: 27 C
Exos probe: 26 C
CPU: 39 C

These are the most relevant and important set of results and they look good, asuming the readings are accurate the CPU temp is over 10 C lower with the Koolance Exos fitted.

I will be adding a Northbridge and GPU cooling block in the future and will post up some temperature readings when these are fitted.

So, I now have a quieter PC and lower CPU temps.

I found this water cooling unit easy to install as my first attempt at liquid cooling. It took about 1 hour to install without any bother.
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Old 22nd May, 2004, 04:07 AM
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Old 22nd May, 2004, 09:57 AM
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Thanks Gizmo!

I have just been investigating stability. Whereas with air cooling the system was not stable at 11.5 x 210mhz, it is now stable at these settings with the water cooling setup.

I will have to experiment further with overclocking.
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Old 5th August, 2004, 03:20 AM
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s0o0o lets think 4 a sec here. u have 3 cooling fans removing heat from water flowing thro the cooling coils, w/ all that process, ur CPU is an AVG of wat like 33 or 34c w/ that whole unit?
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Old 8th August, 2004, 02:24 PM
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The unit can be used to cool more than just one CPU. I have chipset water-blocks on the way for GPU and motherboard. It is also possible to cool say two CPUs in two different machines via use of adaptors.
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Old 15th August, 2004, 07:43 PM
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I now have the GPU waterblock and a Northbridge waterblock. The GPU block comes with a set of aluminium RAM sinks. The inlet and outlet on the GPU block can be rotated for easier hose fitting.

The GPU block:
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Koolance Exos Mini-Review-gpu_block.jpg  
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Old 15th August, 2004, 07:50 PM
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The base of the block is gold plated and so flat and shiny that the camera can't focus correctly. The sensor beam just bounces off it!
Attached Thumbnails
Koolance Exos Mini-Review-gpu_lapping.jpg  
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Old 15th August, 2004, 07:57 PM
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This block is for the Northbridge chip. It is much the same as the GPU block except the inlet and outlet are fixed in position.
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Koolance Exos Mini-Review-chipset_block.jpg  
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Old 16th August, 2004, 12:32 AM
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Cant wait to see how the new blocks perform, ive got a brand new Asetek Waterchill GFX block sitting on the shelve, would love to see if in your case the use of the GFX block raises or lowers system temps. Thanks Danrok
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Old 16th August, 2004, 09:02 PM
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Just waiting for my new 6800 Ultra to turn-up on the door step and then I'll fire these new babies in there!
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