I have some problem with HDMI:
when connected HDMI monitor the memory on the graphics card has a maximum load (1500Mhz).
this happens without additional load (a game or something like that)
but when no load frequency should be of 150MHz
same problem with the GPU processor:
with HDMI - 500Mhz
without - 300Mhz
graphics card turns out to be loaded almost to the maximum, and the temperature rises to 52C
it should be between 40 ° C
Please look attached screenshots
Here's my system:
Video: PowerColor Radeon R9 280X 3072 gb
proccesor: Intel Core i7-2600K
mb: Asus P8Z68-V Pro/Gen3
ddr3 2x4gb Kingston 9905403-402.A00LF
would like to add also, before I had a card Powercolor PCI-ex Radeon HD7870 2Gb and had no such problems.