Сообщение от :
Is it possible to change the VRAM Size? Yes, you can do that, but do you need the extra Memory for your über slow IGP? No.
Apple has decided, that 144 MB for this IGP is enough. The VRAM Size 144 is 128 for the IGP to deal with 2D/3D Stuff + 16 for the external Display, dual view. Intel gives as max 384 MB video memory for that IGP, so its "should" be the best Size for VRAM.
From the IOReg (ioreg -l) you find such Information under AppleIntelGMAX3100FB and AppleIntelFramebuffer:
"VRAM,totalsize" = <00000009>
"IOFBMemorySize" = 268435456
00000009 is Hex for 144 (Dec) but Numbers are flipped (144 = 0x90)
00000018 is Hex for 384 MB, thats 3 x 128 MB
Thats the minimum and maximum MB given from the AppleIntelGMAX3100FB. The IOFBMemorySize 268435456 is 256 MB. You can change the VRAM total size (You know how!, hex hex hex), its hardcoded in the FrameBuffer Binary File, but it wont give you any reasonable result, so its pointless. The damn Intel IGP is just slow as a tricycle against a Formula 1 car.