AKASA Silver Mountain 2

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Another top peformer — Joe

SUMMARY: Very good performance, although somewhat weighty for mounting on a single lug.

Akasa 2

Size: 60 x 72 x 73mm high; Weight 580 gms; Fan: YS Tech 38 cfm @ 6800 rpm

Crazy PC was nice enough to send over an AKASA Silver Mountain 2 to test out. This is a pin-fin, all copper heatsink that is silver plated. I doubt that it adds anything to cooling, but it does make for a pretty picture and marketing tag-line.

This is the successor to an earlier model whose base measured 60 x 60mm – the “2” is 10 mm longer on one side.

This heatsink is no light-weight; weighing in at 580 gms (about 1¼ pounds), this is a serious chunk of copper. Note that the Akasa’s clip engages one socket lug – this IS NOT a heatsink to leave on if you are transporting your PC to a LAN party. I would feel a lot better if the clip engaged all three lugs.

If you look closely at the base,

Fins Close

you can see small “cut marks” – it looks like the pins (252 in all) are punched into the base and these marks are as a result of this process. Performance will depend on how well the pins are mated to the base.

The base

Base

is very smooth and flat – a nice job.

The fan is mounted on a skirt which raises the blades above the pins – helps to reduce noise somewhat. The fan is YS Tech NFD126025BB-2F, rated 38 cfm @ 6800 rpm. I measured noise with a Radio Shack sound meter 8″ from the fan’s intake at 69 dBA, about the same noise as a Delta 38. This fan is rated at 7.2 watts and comes with a four pin adapter; there is an rpm wire which plugs into a fan header so you can monitor rpms.

The clip requires a screwdriver to mount. I found it easy to mount – the slot for the screwdriver is secure enough so the potential for a slip appears minimal. Although I’m getting used to these, I still don’t like them because doing this inside a cramped case is not fun.

THE TEST

The Akasa was first tested on the CPU Die Simulator which gives results that are unaffected by motherboard influences. I then tested it on an Iwill KK266+ and Shuttle AK31, modified to read AMD’s on-die diode, as an example of what users might see on their systems.

TEST RESULTS – CPU Simulator

Heatsink

Die Temp

Ambient Temp

Delta

C/W

Akasa SM2, 77.3 watts

46.5 C

20.1 C

26.4 C

0.34

TEST RESULTS – Motherboard
CPU/Motherboard

CPU Die Temp

Ambient Temp

Delta

C/W

CPU Back Temp

Palomino 1200, Iwill KK266+, 55 w

34.6 C

21.4 C

13.2

0.24

36.2 C

XP @ 1467, Shuttle AK31, 65 w

38.7 C

19.8 C

18.9

0.29

34¹ C

¹In-socket thermistor temp

Delta = CPU temp – Ambient Temp
C/W = Delta / CPU Watts

Interpreting C/W: For every watt the CPU radiates, the heatsink will cool the core by the (C/W x watts) plus ambient temp. For example, at an ambient temp of 25 C, a C/W of 0.25 with a CPU radiating 50 watts means that the CPU core temp will be 50 x 0.25 = 12.5 C over ambient temp, or 37.5 C. The lower the C/W, the better.

Die Simulator results place the Akasa Silver Mountain 2 in the top rank of heatsinks (Heatsink Ranking).

CONCLUSIONS

The Akasa Silver Mountain 2 does a very nice job, and why not? Lots of pins, lots of copper and lots of air flow (and noise) – works every time!

Thanks again to Crazy PC for sending this our way.

Email Joe

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