At only $40 the AR11 is a rock-solid cooler that will fit in all but the smallest of cases. SilverStone’s latest addition to its Argon Series of CPU coolers takes on one of the more challenging parts of building a HTPC or ultra-compact gaming rig: Size. Shrinking a build typically makes it difficult to find a CPU cooler that provides proper cooling without either making a ton of noise or interfering with other components on the motherboard such as the RAM and PCI-express slots. Thankfully, the AR11 is budget-friendly in addition to being both cool and compact.