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Voltage regulators can run especially hot on late model VGA cards (ATI 5870 & 5850), upwards of 100-120 degrees C. Thus, Thermalright created a cooling solution to help stabilize VGA overclocking. Both of the VRM heatsinks share the same compatibility information (ATI 5870 & 5850). Although VRM-R3 is designed to take advantage of a side panel case fan, while the VRM-R4 is positioned utilize the airflow of a tower style CPU cooler (as demonstrated in the photo).
Compatible Cooler : HR-03 Rev.A / HR-03 GT / V2 / T-Rad2 / T-Rad2 GTX
Compatible VGA CARD : ATI HD 5870/5850 VGA Card
(only compatible with Stock PCB design / Reference design)