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10.9.0 on Acer Aspire X3400G w/ aftermarket GPU — not reaching max resolution

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So I recently managed — and with a surprisingly small amount of pain! — to install Niresh's Mavericks on my Acer Aspire X3400G (specs here; ignore the processor frequency, it's actually 3.1 GHz). The only things that don't work properly are the Internet (for which a solution is in the mail) and my graphics card, a Sapphire Radeon HD 5570. Now, while the Radeon can hit 1920x1080 over VGA on Windows 7, on Mavericks it will only go up to 1600x1200. What am I doing wrong and how might I fix it?

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@Devonic How? OS X doesn't recognize any EDID, and the only two Windows has are for the HDMI output and one created by Parallels... I'm hooked up over VGA right now, by the way.

 

(Also I'm moving in with my dad, so it could be a while before you hear back from me again.)

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