Scythe Kama Cross CPU Cooler Review

Testing

Testing

Cooling Performance
To be honest I really wanted to push this heat sink to failure, and I think I managed it quite well. Throwing 3.4Ghz of overclocked quad-core at an heat sink not designed for performance, really is a big ask.

You can see from the graph below that the Scythe Kama Cross provides better temperatures across the board than the Intel reference cooler. Not that this comes as a shock to anyone! However, what is interesting to note, is that the default 100mm fan that comes with the Scythe Kama Cross managed to cool the heat sink by a margin of around 3.0 degrees Celcius better than the Scythe S-FLEX 120mm. This is interesting to note because the Scythe S-FLEX 120mm provides more CFM of airflow than the default 100mm one that came with the Scythe Kama Cross.

Furthermore; you will notice that I haven't included the temperatures for the 'Overclocked (Load)' section of the graph. Both the Intel and Scythe Kama Cross heat sinks were struggling with the heat-load of an overclocked quad-core processor. Whilst not at all surprising, I must admit though, I thought the Kama Cross would have been able to 'handle it'. Once temperatures reached 80 degC I immediately stopped both instances of Stress Prime 2004, and recorded a '0' result. I'm sorry but 80 deg C is just a little too toasty for my liking, and certainly not a viable option for prolonged usage.


Scythe Kama Cross performance chart

Ambient Temperature: 23.3 - 23.9 DegC
Overclock: 3.4Ghz (378 x 9) @ 1.45v

 
Not one to be put off easily, I decided it was time to bring out the big guns in an attempt to tame the quad-core. The highest CFM fan I have available here is a 92mm Sunon Tornado which is capable of pushing 119 CFM at an ear bleeding 56.4 dB(A). Strapping the Sunon onto the top of the Scythe Kama Cross resulted in an immediate drop in temperatures, but our quest for near silent operation was thrown clean out the window. I have included the results below:

 
Scythe Kama Cross Cooling performance

Ambient Temperature: 23.3 - 23.9 DegC
Overclock: 3.4Ghz (378 x 9) @ 1.45v

 
Taking a look at the figures a little closer we can see just how efficient the Scythe Kama Cross really is, when compared to the Intel reference heat sink. Please bear in mind that this is for stock (idle and load) temperatures, as I am unable to determine accurately the power  used by the processor when overclocked.

Let's use the formula: Heat Sink Efficiency (C/W) = (CPU Die Temp - Fan Intake Temp) / CPU watts

Intel Reference heat sink - 0.24C/W (Idle) and 0.54C/W (Load)
Scythe Kama Cross - 0.12C/W (Idle) and 0.34C/W (Load)

Looking at the numbers above it is now blatantly obvious just how bad the Intel reference heat sink really is.

Let's have a look at the noise readings...

Noise

The Scythe Kama Cross is extremely quiet when using the default 100mm fan, and the same can be said for the Scythe S-FLEX 120mm fan. I would have no qualms about recommending this heat sink to those who prefer silence.In fact, I found the pitch and noise from my Palit 8600 GT graphics card was more noticeable than the Scythe Kama Cross.
 
 Fan Noise level chart
 
You can see from the graph above that the Scythe Kama Cross with the S-FLEX 120mm fan offered the quietest solution, but we also know that it didn't offer the best cooling performance. However; regardless of which option you chose to run with the overall performance is definitely more than acceptable.

Now that we have thoroughly analysed the Scythe Kama Cross CPU Cooler let's head over the page to see how it performed as a whole in our performance testing today...
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Most Recent Comments

21-11-2007, 06:48:54

llwyd
God I hate that twistlock system

looks like a quality cooler but the markets so saturated I find it hard to get excited about any air coolers whatsoever these days

anyway, another quality review mateQuote

21-11-2007, 08:43:55

MikeEnIke
Meh, it seems like a decent mid-range cooler. Would be good for the HTPC or just a family build, not really the OCing side.

Nice review mate.Quote

21-11-2007, 12:12:17

chudley
In a PC mag review this cooler caused the PC to run hotter than the stock cooler. Quote

21-11-2007, 12:30:31

duke
Quote:
Originally Posted by name='chudley'
In a PC mag review this cooler caused the PC to run hotter than the stock cooler.
Which PC mag was that?

It certainly looks cool, not that that's anything to go on Quote

21-11-2007, 17:13:23

PV5150
Quote:
Originally Posted by name='chudley'
In a PC mag review this cooler caused the PC to run hotter than the stock cooler.
Thanks guys it is a very capable little cooler.

Quote:
Originally Posted by name='chudley'
In a PC mag review this cooler caused the PC to run hotter than the stock cooler.
Weird, I never found that. I didn't think anything could perform worse than the Intel reference cooler Quote
Reply
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