My slowest pc is a 1.6GHz netbook with Windows 7. It is just fine at network work. HOWEVER this is just under the mark where you can watch any HD or even a movie full screen. Hulu and others have to be played at less than full screen.
My slightly better Lenovo 499 buck laptop is a y530 with 4GB RAM, 7 and integrated Intel 4500MHD with HDMI out and plays 1080p content with ease.
Is the wireless internet speed affected by the computer RAM and CPU only? If so, what the RAM and CPU/Processor Speed should be at least to watch an HD movie online?