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This review is from: Nexus CFA-300 80 or 92mm to 120mm Fan Adapter
Pros: Works awesome as a shroud / duct to direct air to back of GPU. Installed on 120mm fan which I zip tied to HDD rack. The smaller 80mm end is pointing to GPU inlet. Lower GPU temp in crossfire was previously excessive; with set-up noted, the lower GPU temp now close to upper GPU temp. Both GPU's have noticeable reduction in temperature.
Other Thoughts: Would recommend as a shroud to direct airflow to back of GPU if you want or need to lower GPU temperature. Only modification necessary was to open mounting holes on 120mm side to allow screw to pass through the adapter to thread / bolt onto fan. Intended use is to use small diameter provided screws through fan to bolt fan onto adaptor, but for my set-up, heads interfered with flush mount to HDD rack. Used zip ties through 80mm side to mount to HDD rack.
My case is a haf x. Fan zip tied to HDD rack is in a location similar to corsair c70 stock fan mount location (middle of case, not at front of case). With my haf x and 5870's in crossfire, 80mm side of duct is about an inch from the back of the GPU's.
Same set-up without duct made little to no difference in GPU temperatures as air was not directed properly. Duct / Shroud ( this adaptor) caused air from fan to be more of a directed stream of air; without the duct the air was diffused an ineffective.