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HD 7770 from 128mbit display to 256 mbit?

Since I got a 7770 in my PC with a 128mbit bus I was wondering how I could upgrade it to 256, since I've seen people upgrading their videocard mbit bus

If it's possible how would I be able to do this, and could I get a clear tutorial on how to do it with my mobo?
(Mobo: MEDION MS-7741
(VC: HD 7770 GHz edition)
(PSU: Corsair CX 430W, more then enough ;)

If I could do this, would it increase, or decrease my gaming performance?

Any help is appreciated
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  1. Best answer
    You can NOT upgrade the memory controller on a video card. It is a part of the chip. You would need to make a new board and chip do even do this(you may be able make a new board(and that would be damn hard), but the chip is something you will not be able make.).

    You want an upgraded memory controller? Best bet is to get a faster card. Most mid end cards have 128.
  2. You cannot mod/upgrade your video card to have a larger memory bus. Your only option is to replace the video card.
  3. You cannot mod/upgrade your video card to have a larger memory bus. Your only option is to replace the video card.
  4. Oh ok thanks, I just had an all-nighter so I forgot what was upgradeable through ram and whatnot.
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