N8 2312 power consumption

normally I use PC power supply. I wanted to make it easier, so I tried to use my N8_2312 with 7,5V/3A power supply but the 7805 is getting hot pretty fast with my standard cooler 12K/W. I tried to measure the power consumption and the input current on 7,5V power supply is about 930 mA which is quite a lot. It is quite logical than with power dissipation about 2,5W and cooler 12K/W it has to be hot. Before I put bigger cooler an maybe replace my 7805 with 78S05 I would like to ask if you experience similar power consumption or is there any fault on my board? I have everything fully populated. I have a small glued cooler on TMS9918 too.

I tried smaller configurations. Without the AY-3-8910 and TMS9918 the input current is around 670 mA. The both 82C55 consume only few mA, if I remove them both I got about 660 mA. With all back on board and only TMS9918 removed the input current is about 700 mA. That means the TMS9918 itself consumes 230 mA.