Hi, the question is ?can i change an integrated-share graphic card on my desktop ? this is my situation i dont know if the memory is integrated on the motherboard i plan to buy this computer but im guessing it is because it says , the radeon hd 4350,250 shared memory so im guessing is in the motherboard.
( sorry for any grammar mistake) :

• Procesador:
- Intel® Core 2 Quad Q9300
- Velocidad procesador: 2.5 Ghz
- Memoria procesador: 6 MB
- Chipset: Nvidia MCP73PV

• Memoria:
- Tamaño: 4 GB
- Distribución de memoria: 2 x 2 GB
- Tipo: RAM DDR II 667/800

• Tarjeta gráfica:
- ATI Radeon HD 3650
- 512 MB dedicados hasta 1919 MB DVI, VGA, HDMI, SVHS

- Audio: Realtek ALC888S, High Definition, 7.1 Channels

• Sistema operativo: Windows Vista Home Premium

And another one with the same Speqs BUt have a Ati radeon hd 4350 insted off ATI Radeon HD 3650 .
My question is ,is this computer good? im afraid de radeon hd 3600 and 4350 used shared memory and i heard of a lot of problems with shared memory playing games, can i only use the dedicaded memory of the card the 512 mg or it has to be shared with the memory ? also is it integraded in the motherboard? if so can i change the graphic card and shanged it even if its integrated?
LOTS of thanks in advance.