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October 2, 2004 by Jeremy Noring with Mike Chin
Nexus PHT-3600 heatsink/fan for Socket 478
Nexus is a brand focused on quiet components and has produced a number of winners in the past. among them the Nexus NX-3000 and NX-3500 power supplies, and the "Real SIlent" line of fans -- which really are very quiet. It's probably not well known, but the Nexus folks have been involved in quiet computing products for a long time; they were behind the creation of the first quiet PSU brand, Q-Technology. For some time time, Nexus has offered a wide range of quiet PC products: PSUs and fans, cases and damping materials, accessories and heatsinks.
SPCR previously reviewed another integrated heatsink/fan by Nexus, the KCZ-2700. That model proved to be a simple, cost effective, compact unit with decent noise levels and a conservative design. The Nexus PHT-3600 appears to be a more robust cooling solution that may lend itself to silence more than its little brother.
Nexus PHT-3600 mounted
The PHT-3600 is an all-aluminum heat sink equipped with a 2400 RPM, 70mm fan, which according to Nexus produces 19 dB. The use of a 70mm is a bit odd given that Nexus has a wonderful 80mm fan with excellent cooling properties, the Nexus "Real Silent" case fan. In addition, smaller fans generally emit more high frequency noise than larger fans, so a bit of skepticism from a silencing perspective should be expected.
According to Nexus, the V-shaped fins are supposed to optimize airflow and prevent "air obstruction", resulting in a stable RPM level and low noise operation. The Nexus says the PHT-3600 is skivved from a single piece of aluminum:
"...one of the worlds most advanced technologies. This concept permits the production of heat sinks with a precise and super fine detail previously considered impossible. SkiveTek ® represents a process of shaping materials to produce lightweight, high fin density thermal solutions. Base plate and fins are constructed out of one piece of pure aluminum or copper by cutting the material into thin layers, bending the fins in place. No bonding, welding, soldering or adhesive is involved. The joint between fin and base is continuous aluminum or copper."
This technique has been used by other brands with not only aluminum but also copper, but invariably the proof is in the pudding.
One positive aspect of the PHT-3600 is its relatively compact size and low weight. At 370 grams, it easily meets the Intel limit of 450 grams. It also has a very simple, easy to use clip that requires no tools for installation. Lastly, included with the heatsink is a cable (with an inline resistor?) to drop the fan voltage to 10V, the NRC1000:
Nexus NRC1000 10V cable
The speed reduction cable is a nice touch, although I would have preferred something that enables variable voltage settings, like the Zalman FanMate.
Model Name: PHT-3600
For: Intel Pentium 4 (socket 478) all speeds
Fan Dimensions: 70 x 70 x 25 mm
Heatsink Dimensions: 75.8 x 65 x 45.2 mm
Combined Dimensions: 75.8 x 79 x 70.2 mm
Fan Speed: 1930~2400rpm (+- 10%, using included 10V cable)
Fan Noise Level: 19 dBA; lower using included 10V cable
Weight: 370g with fan
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