Thermalright SI-128

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Heatsink Test – Joe

SUMMARY: Very good performance even at relatively low fan speeds.

Pic

The good guys at Thermalright were nice enough to send us a sample of their latest heatpipe heatsink, the SI-128, to test. This model features four large heatpipes cooled by a 120 mm fan.

The base is well finished; I used the Poor Man’s Flatness Test on it with good results:

Base

Base

Parts that ship with the SI-128 include mounting gear for Intel 775 and AMD K8 sockets:

Parts

The heatsink for Intel use is mounted to the motherboard using four mounting posts that engage the holes around the socket:

Post

You push down and then rotate the top to lock it in place – the only negative is that in some instances it may require some digital dexterity to reach under the heatsink and do the “push-rotate” sequence.

The Test

The SI-128 was tested on an Asus P5WD2 motherboard P4 Motherboard Test Platform with a modified Pentium D 805 to read CPU case temps (both supplied by Directron). The SI-128 was tested with a Delta 120 mm fan at various fan speeds to give a range of results.

Heatsink

Case Temp

Ambient Temp

C/W

On-Die Temp¹

Thermalright SI-128, 2451 rpm, 56 dBA²

38.9

25.7

0.14

52

Thermalright SI-128, 1766 rpm, <50 dBA²

40.7

26.5

0.15

54

Thermalright SI-128, 1028 rpm, <50 dBA²

46.2

27.9

0.19

59

Thermalright Ultra 120, 2504 rpm

34.8

24.6

0.11

44

¹MBM on-die temperatures.
²50 dBA measured 8″ from the fan intake corresponds to about 30 dBA measured 3 feet from the fan, a very quiet noise level.

Results place Thermalright’s SI-128 in the upper rank of heatsinks tested to date (Heatsink Ranking) with the fan at its highest speed setting. Performance at the lowest fan speed is acceptable; at this setting, the fan is almost silent – inside a case, the fan on low will not be noticeable. I included test results for Thermlaright’s Ultra 120 as a reference point.

CONCLUSIONS

Thermalright’s SI-128 is a very good all-around heatsink and a good choice for Intel’s hotties.

Disclosure: Joe Citarella has a financial interest in a company developing thermosyphon products for electronic chip cooling.

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