Intel GMA shares max 128 mb
Refer
*www.intel.com/design/graphics/gma900/
tho u can change this setting from ur BIOS but its not recommended that u nose around in ur BIOS
and in wat context are u talking of 224 mb ram and the dxdiag stuff
coz as i said u can only share max 128 mb of ram as video ram
and if u have 1 gb of total ram how can u have a display of 128 mb this 128 mb is actally ur video ram and not system ram
The best for u is to get everest home edition from
www.lavalys.com and analyse ur pc thru it