Bjorn3D posted a review on the CoolIT Systems PCI Cooling Booster

Most of the time, the PCI expansion cards do not need any additional cooling as these components are not subject to overclocking and hence they should not overheat like the rest of the components. With the exception of the graphic card, the area around the expansion slots usually does not have any designated cooling except the heatsink and sometimes the fans attached to the cards themselves. However, this does not mean that these components do not need proper cooling and any additional cooling to the internal components is welcomed as long as it does not add too much or any noise to the overall system. LetÂ’s see if the CoolITÂ’s PCI Cooling Booster can fulfill this requirement and keep the expansion cards cool.

CoolIT Systems PCI Cooling Booster Review