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Xigmatek HDT-S1284 (CAC-SXHH4-U01) + Crossbow

Xigmatek HDT-S1284 cooler is also a new product, although its name and design are similar to the previously reviewed Xigmatek Achilles S1284. This time, however, the box is designed in light-green color, although it still has the same information on it, such as key features of the cooler, detailed technical specifications, the list of compatible processor sockets and other less important info:


There is the same polyurethane foam casing inside the cardboard box that holds the cooler and the fan and a plastic bag with accessories stored in its upper part:

Among the bundled accessories are the following components:

  • Two retention brackets with plastic clips for LGA 775 mainboards;
  • Swing-clip for AMD K8 and K10 processors;
  • Five silicone spindles for attaching the fans to the heatsink;
  • Two retention screws for LGA 775 kit;
  • 1g pack of SilMORE thermal compound;
  • Assembly and installation manual.

Xigmatek HDT-S1284 cooler is made in Taiwan.

Now let’s take a look at the heatsink:

It looks very similar to the heatsink of Xigmatek Achilles S1284 cooler, that I have already mentioned above, however, there are a few very significant differences between them. First of all I mean the larger number of aluminum heatsink plates in the array. There are 54 of them instead of 46. Since the heatsink dimensions remained the same – 120 x 60 x 159 mm – they had to make the plates thinner (they used to be ~0.25 mm thin, and now they are only ~0.20 mm) and to reduce the gap between the plates from 2 to 1.5 mm. moreover, the plate side edges are no longer bent and closed together, like we saw by Achilles. So, the heatsink have become denser and more saturated, and its effective surface area has definitely increased:



Copper heatpipes (without any nickel-plating this time) are 8mm in diameter and are shifted from one another so that the heat could get more evenly distributed over the heatsink body.

 The base has also undergone some modifications. Now the distance between the heatpipes is minimal and equals 1~1.1 mm (Achilles used to have 2 mm):

I believe it is a very serious improvement, because the smaller are the gaps between the heatpipes in the base of a cooler, the more efficiently the heat will be transferred from the CPU heat-spreader to the heatpipes. The base is impeccably even and finished for an HDT solution. The thermal compound imprint on the glass surface and most importantly on the CPU heat-spreader was practically ideally even:

As you can see, only two central heatpipes have full contact with the CPU, while two side heatpipes cover the processor heat-spreader only by half. Of course, if we compare the base of the new Xigmatek HDT-S1284 against that of the old one, the contact will look undoubtedly better on the new one.

The cooler is equipped with 120 x 120 x 25 mm fan with 7 blades:


The fan rotation speed is automatically adjusted from ~800 RPM to ~1500 RPM using PWM method. The maximum airflow it creates equals 56.3 CFM and the level of generated noise shouldn’t exceed 27.2 dBA. They used rifle bearing that should last for 40,000 hours (over 4.5 years of non-stop operation). The fan is attached to the heatsink with the same silicone spindles inserted into heatsink plates.

The cooler is installed exactly the same way as the above described Xigmatek HDT-SD964. If at some point you have any questions about installation procedure, you can always download the manual from the official web-site (PDF file, 3.92 MB).

Inside a system case the new Xigmatek HDT-S1284 looks as follows:

The distance from the mainboard surface to the lower heatsink plate is sufficient for the cooler not to interfere with anything around the processor socket. Xigmatek HDT-S1284 MSRP is set at $45.

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