SIBAK AC-01-625B

A quiet one for Mom — Joe

SUMMARY: Easy on the ears, too easy on performance – one for Mom.

SIBAK was nice enough to send us their SIBAK AC-01-625B to test out. The picture on the site is dated as this model features a 70mm fan and sports a clip which engages all three socket lugs. I like this feature as it makes for extremely secure mounting – in addition, if you have a broken socket lug, a clip such as this is a necessity.

The heatsink is an all aluminum extrusion

of fairly conventional design. The base

is very nicely done – no machining marks discernible to the touch and flat.

The fan is an Everflow Model #R127015DU – a 70 x 15mm unit rated at 26 cfm @ 4200 rpm (note: The fan I had ran at about 4500 rpm; I took the specs from Sibak and this model might be slightly different). I found it to be tolerably quiet – I measured its noise at 62 dBA with a Radio Shack sound meter 8″ from the fan’s intake, substantially less than a Delta 38 (about 69 dBA). It’s also safe to use a motherboard fan header.

The fan is surrounded by a fairly attractive enclosure – but that’s all it is – the holes are strictly for looks.

The clip engages all three socket lugs – a bit of overkill for a heatsink this light, but I’ll take it. It does not require a screwdriver to mount and is easily mounted by hand – I wish more heatsinks came with such a clip.

In summary, a fairly conventional aluminum extrusion heatsink with a very secure and easy to use clip.

The Sibak 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.

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 SIBAK AC-01-625B in the lower ranks of heatsinks (Heatsink Ranking).

Not a standout performer, but an OK cooler for Mom.

Thanks again to SIBAK for sending this sample our way. Sibak is looking for distribution – contact details:

SIBAK COOLER (explotech co., ltd)
5F, No. 114 Tein Mu East Road
Taipei, Taiwan, ROC
886-2-28772086, fax 886-2-28771142
Email Sibak
Some background on SIBAK from Computex.

Email Joe