"Some months ago we tested Cooler Master Hyper TX3 cooler, which has done well for a mainstream cooler. Cooler Master has revised this cooler and we decided to review this new version, which got the new part number RR-910-HTX3-G1, while the older version is internally called RR-910-HTX3-GP. Cooler Master is calling using the same name on this new version and therefore we decided to refer to the new revised model as "Hyper TX3 G1" to avoid confusion."
Cooler Master Hyper TX3 G1 CPU Cooler Review @ Hardware Secrets
