| Specifications
First things first, here are the specifications of both the
heat sinks. Both of the heat sinks features the same fan.
Fan Specifications
| Operating Range |
6.0 - 13.8 VDC |
| Rated Voltage |
DC 12V |
| Rated Current |
0.28A |
| Rated Input |
3.36W |
| Bearing System |
One Ball, One Sleeve
Bearing |
| RPM |
5500 +/- 10% RPM |
| Air Flow |
28.95 +/- 5% CFM |
| Noise |
41.5 dB/A |
| Fan Dimensions (mm) |
L60 x W60 x H20 |
| Fan Safety |
UL |
| Output Signal |
Yes |
| MTBF |
20, 000 Hours |
Heat Sink Specifications
| |
NP80D |
NP60D |
| Heat Sink Dimensions (mm) |
L60 x
W80 x H35 |
L60 x W60
x H25 |
| Heat Sink Fin Count |
27 +/- 1
fin |
31 +/-
1 fin |
| Material |
AL |
AL |
| Clip Material |
Steel SK7 |
Steel SK7 |
| Power Connector |
Molex
2510 3-pin |
Molex
2510 3-pin |
| Gross Weight |
260g |
170g |
As you can see from the specifications above, the main
differences between the NP80D and NP60D coolers are the widths of
the heat sinks, their fin counts and their gross weight. From the
specifications alone, it's hard to see which heat sink would
perform better.
Each seems to have different means of obtaining more surface
area. Although the weight difference may hint that the NP80D has
the edge over the NP60D, let's do a rough calculation of the
surface area of both heat sinks and see which has the most.
The fins are actually curved like a wave. So these calculations
do not reflect the real value but are just a rough way of
calculating if a wider fin or more smaller fins would be more
effective in obtaining a greater surface area. For these
calculations, I used the height of the heat sinks as the fins'
vertical height.
Total surface area of NP80D = 27 x 2 x
(surface area of a fin)
= 54 x (80 x 35)
= 151200 mm2
Total surface area of NP60D = 31 x 2 x
(surface area of a fin)
= 62 x (60 x 25)
= 93000 mm2
So, the NP80D does, in fact, have a greater
surface area and should perform better than the NP60D. But let's
confirm this by testing them to see if how much effect that
increase in surface area has. |
