Arkua ™ 7528

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Competitive performance at tolerable noise levels. — Joe

SUMMARY: Competitive performance at tolerable noise levels.

Arkua

Dimensions 75 x 75 x 62mm; Weight 321 gm; Fan 70 x 15mm, 36 cfm @ 4500 rpm.

The good folks at Arkua™ were nice enough to send a sample of their Socket A heatsink, model #7528. It features a solid copper core surrounded by extruded aluminum fins. The core appears to be well fit – reminds me of the Alpha base. Effective cooling requires a very tight fit so that there are no air spaces between the copper core and the aluminum fins.

The heatsink is powered with a 70 mm fan – a tradeoff between excessive noise and high airflow through the fins. It also comes in a Delta 38 version which will most likely be noisier but more efficient. I measured fan noise with a Radio Shack sound meter placed 8″ from the fan intake and recorded 60 dBA¹ – slightly less noise than a YS Tech 26 cfm unit.

The base

Base

is relatively smooth with slight machining marks. Note that the CPU does not locate on the center of the copper core, although almost all of it contacts it:

Footprint

NOTE: I used a lot of grease to show the footprint.

The clip requires a screwdriver to mount on the socket, but is one of the better of this type. The slot for the screwdriver blade is wide and deep enough so that the chance of a disastrous slip is minimal.

All told, the Arkua™ appears to be well made and fairly easy to mount and dismount from a socket.

THE TEST

The Arkua was first tested on the CPU Die Simulator which gives results that are unaffected by motherboard influences. Tests then were conducted on a variety of motherboards as examples of what users might see on their systems; results will vary depending on local factors such as case airflow, ambient temps, etc. The PIII MBM temps are on-die, the others are in-socket thermistors. Temps were taken after temps stabilized while running Prime 95, usually after about one hour.

TEST RESULTS – CPU Simulator
Platform

Die Temp

Ambient Temp

Delta

C/W

Simulator, 77 Watts

47.8 C

20.0 C

27.8

0.36

TEST RESULTS – Motherboards
CPU/Motherboard

MBM Temp

Ambient Temp

Delta

CPU Back Temp

T-Bird @ 1400/Iwill XP333 (72 watts)

38 C

22.3 C

15.7

NA

XP1600 @ 1400/Shuttle AK31 (61 watts)

35 C

21.1 C

13.9

NA

Duron @ 1000/Iwill KK266+, (63 watts)

32 C

20.5 C

11.5

38.7 C

PIII @ 933/Iwill BD133, (25 watts)

32 C

19.2 C

12.8

NA

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 temp will be 50 x 0.25 = 12.5 C over ambient temp, or 37.5 C. The lower the C/W, the better.

The Die Simulator results ranks the Arkua™ in the Heatsink Roundup alongside the Thermalright SK6 – nice company! Results by users will depend on continuing QC to ensure a close fit between the copper core and fins.

CONCLUSIONS

The Arkua™ turns in a decent performance at noise levels that are not excessive. The Delta 38 version should do better but with objectionable noise levels.

¹This is not comparable to manufacturer sound ratings – manufacturers usually take readings at a distance of three feet from the fan.

Thanks again to Arkua™ for sending this sample our way.

Email Joe

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