The Arctic Liquid Freezer III 420 A-RGB fits in a PC case that can accommodate a radiator size of approximately 420 mm in length. The radiator dimensions are about 458 mm (length) x 138 mm (width) x 38 mm (height).

The Thermaltake View 380 XL TG ARGB case supports graphics cards up to 420 mm in length and CPU coolers up to 160 mm in height, but the key factor for fitting the Liquid Freezer III 420 A-RGB is the radiator mounting space. This case is a Midi Tower and typically supports radiators up to 360 mm or 420 mm depending on the mounting options.

Given the radiator length of 458 mm, it is likely that the Liquid Freezer III 420 A-RGB radiator may be too long to fit comfortably in the View 380 XL TG ARGB case, which is designed for standard radiator sizes up to 420 mm. The case specifications do not explicitly confirm support for a 420 mm radiator of this length.

Therefore, the Arctic Liquid Freezer III 420 A-RGB may not fit properly in the Thermaltake View 380 XL TG ARGB case due to the radiator length exceeding typical 420 mm radiator mounting space in this case. It is recommended to verify the exact radiator mounting dimensions of the case before installation.