Why is my AMD R9 270 2GB G DDR5 overheating ?

All other processors are well within tolerances so why is my GPU running so hot ?

This is a recent development; started about 2 months ago. Yes, I have dusted it.

Hopefully I have included enough pertinent information.

Operating System

    Windows 10 Home 64-bit


    Intel Core i7 4790 @ 3.60GHz    36 °C

    Haswell 22nm Technology


    24.0GB Dual-Channel DDR3 @ 798MHz (11-11-11-28)


    Dell Inc. 0KWVT8 (CPU 1)    28 °C


    LG TV (1920x1080@59Hz)

    2048MB ATI AMD Radeon R9 270  (ATI)    82 °C

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