here u can see...i ve checked this in almost all games including rockstar games la noir where it touches 700 mb+ havent played gta4.... but i know intel card have some issues with rockstar games .... people who overclocked ther hd 3000 from 850 default to 1800 can get it to run smoothly. even l a noir runs at 15 fps.
That's not your dedicated memory size, it stayed the same as you can see in your screen. As I said the iGPU can theoretically use all of the dynamic RAM which is 1,7 GB big or 1,8 GB. Some applications like GTA4 detects only your 64 MB and refuse to run or don't let you run in a higher graphics setting. That's the problem. Basically the dedicated memory size is unimportant except for some applications with a wrong VRAM detection.