Scythe pushes towards Infinity (renamed Mugen)

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The fan's model number identifies it as an Adda model — the same one found in several of Scythe's other products, including the Ninja Plus. Decoding the model number reveals that the fan is classified as "Ultra Low" speed, and has a sleeve bearing. Scythe heatsinks generally come with quiet fans, and this one should be no exception.

A low speed model that appears to be sourced from Adda.

As mentioned, the fan can be attached to any of the heatsink's four sides, but it looks goofy on the narrow ends. The low speed fan is unlikely to do well in this configuration; not only does it have to contend with the double fin density across the whole width of the heatsink, but the heatpipes themselves block a substantial portion of the airflow.

The fan is mounted using two wire clips that are identical to the clips that come with the Ninja. The clips can be quite tight, and several Ninja users complained that they were difficult to install. This goes double when installing the fan on the ends of the heatsink as the narrower sides put the clips under even greater tension.

Just because it's possible to mount the fan this way doesn't make it a good idea...

The is how the fan should be mounted for optimal cooling.


The copper base is polished flat and smooth, and is thinner than most bases. It is also slightly wider, as it must be to transfer heat to all five heatpipes.

The base is mirror smooth.

The Infinity uses the same universal mounting system as the Samurai Z and the Mine, both of which impressed us with their ease of use and the fact that they require no tools. All three of the common CPU sockets are supported: Socket 478, Socket 775, and AMD's K8 sockets, including AM2. Each mounting system comes with its own set of clips, which themselves clip onto the heatsink as illustrated below.

The mounting system uses the stock retention brackets for Socket 478 and K8 systems, neither of which is well suited to supporting nearly a kilogram of metal. The K8 mounting system in particular seems very fragile, as the heatsink is only held on by two thin plastic nubs. We would not recommend moving any system with the Infinity installed. Although not as simple to use, a backplate-based mounting system might be more appropriate for a heatsink of this size.

The clip for Socket 478...

...attaches to the heatsink as shown here.

Unfortunately, the universal mounting system does not allow the heatsink orientation to be chosen. Socket 775 systems avoid this issue thanks to the square layout of the mounting holes, but other systems may end up with the heatsink facing the wrong direction. K8 boards that can mount the Infinity correctly should have mounting nubs pointing towards the backplate.

Socket 478 boards may face a problem no matter which orientation the Infinity would be installed. Most boards that support Socket 478 locate the CPU very close to the top edge of the board, which means that, if the heatsink it oriented so that air is blown out the back, the side fins are likely to hang over the top edge of the board — the space typically occupied by the power supply. On the other hand, boards that do not have this problem will inevitably require the airflow to be vertical, which is less than ideal for low noise cooling. In addition, Socket 478 was not designed with as much clearance around the CPU socket as more recent systems, so the Infinity's large size may be an issue. The photos below show how tight a fit it was in our test system.

The fan just barely clears the RAM on our test system.

On the other side, the heatpipes touch the capacitors beside of the retention module.

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