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VRam in DSDT

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Hello.

I have graphic card with 4096Mb. Tell me please what i have to change in this:

"VRAM,totalsize", 
Buffer (0x04)
{
0x00, 0x00, 0x00, 0x80
},

Now system profiles shows me 2048Mb instead 4096Mb.

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<00000002>-------------32------------------<0x02000000>


<00000004>-------------64------------------<0x04000000>


<00000008>------------128------------------<0x08000000>


<00000010>------------256------------------<0x10000000>


<00000014>------------320------------------<0x14000000>


<00000020>------------512------------------<0x20000000>


<00000028>------------640------------------<0x28000000>


<00000030>------------768------------------<0x30000000>


<00000038>------------896------------------<0x38000000>


<00000040>-----------1024 (1.0GB)--------<0x40000000>


<00000050>-----------1280 (1.28 GB)------<0x50000000>


<00000060>-----------1500 (1.5 GB)-------<0x60000000>


<00000080>-----------2000 (2.0 GB)-------<0x80000000>


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<00000002>-------------32------------------<0x02000000>

<00000004>-------------64------------------<0x04000000>

<00000008>------------128------------------<0x08000000>

<00000010>------------256------------------<0x10000000>

<00000014>------------320------------------<0x14000000>

<00000020>------------512------------------<0x20000000>

<00000028>------------640------------------<0x28000000>

<00000030>------------768------------------<0x30000000>

<00000038>------------896------------------<0x38000000>

<00000040>-----------1024 (1.0GB)--------<0x40000000>

<00000050>-----------1280 (1.28 GB)------<0x50000000>

<00000060>-----------1500 (1.5 GB)-------<0x60000000>

<00000080>-----------2000 (2.0 GB)-------<0x80000000>

 

thanks, but i know this, i need 4096Mb

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