AOpen EY855-II Pentium M SFF barebones system

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HEATSINK FAN

The supplied integrated heatsink / fan is a simple all aluminum device with wide fin spacing. A 70 x 15mm fan is used to blow the air through the fins, across the width of the case. . The steel spring clips are standard socket 478 fare: Pretty easy to use and quite secure.


Back to all aluminum.


The base is smooth enough.

The HSF is installed with the fan on the left side of the case blowing towards the right. Some benefits from this side-to-side airflow arrangement:

  • Low back pressure to the fan compared to the conventional blow-from-top setup. This reduces turbulence noise.
  • Hot air from the CPU/HS is directed out of the case through the right side vent instead of using another fan to do that job.

POWER SUPPLY

The power supply is not a standard design, but the same type used in other AOpen SFF. It's a bit smaller than a mATX PSU, but with a fan that faces the back panel, like an ATX PSU. It uses an 80x20mm fan whose speed is thermally controlled. This is better than the smaller fans often used in SFF systems, because 80mm is about the smallest diameter fan that can push a decent volume of air without having to spin too fast. A label on the PSU provides the following specs:

AC Input
115 / 230 VAC, 50-60 Hz
DC Output
+3.3V
+5V
+12V1
+12V2
-12V
-5V
+5VSB
Current (A)
17
18
8
14
0.3
0.2
2
Max Power
115W
96W
168W
3.6W
1W
10W
Total Power
275W

Surprisingly, it offers dual 12V lines and a 24-pin main ATX connector, which implies electrical compliance with ATX12V v2.0. The PSU is equipped with passive power factor correction.



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