So today I decided I would switch from a DVI cable to an HDMI for my computer. However, I found that when using my HDMI cable the largest resolution I could achieve was 1680x1050. My native resolution is 1920x1080 for my monitor, and it has always worked for both DVI and VGA in the past. When I go above 1680x1050 the picture does not take up the full screen, and instead is smaller than it should be and is centered with about an inch border of blackness around it.
Windows 7 64-bit Radeon HD 6870 1GB Intel i3-2120 @ 3.30 GHz Biostar Mobo H61MGC
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More aboutsapphire 6870 resolution problem hdmi
Go into CCC and set scaling to full screen in properties for digital monitor.
Why switch cables? DVI and HDMI do the same thing, just the HDMI can carry audio too.