Look out everyone, the rebranding fairy is at it again. The HD5750 and HD5770 are being magically poofed by AMD into the HD6770 and HD6750 and being aimed at the OEM market for prebuilt computer integration.
The Juniper based cards will mostly keep their familiar 5 series specs: 128-bit memory interface, 720/800 stream processors, and 1GB GDDR5 memory onboard. OpenGL 4.1 support as well as HDMI 1.4a connectivity have been added to the "new" cards. Keep an eye out for them in Dell and HP machines soon.