Very low dedicated video memory

I'm using
window 7 ultimate, 64 bit
processor: AMD Athlon(tm) II x3 450 processor 3.20GHz
6GB of ram

Now about the GPU:
chip type: GeForce 7025/nForce630a
DAC type: Intergrated RAMDAC
Adapter string: GeForce 7025/nForce630a

Total available Graphics Memory: 2287MB
Dedicated video memory: 256MB
System video memory: 0MB
Shared System Memory: 2031GB

I've tried changing the settings during the startup in BIOS, but there isn't a higher option than 256MB.
Dont tell me to buy another graphic card...im too poor
help?

EDIT: not technically an account issue, but none of the categories apply to my case.

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