Trouble with Display fitting to Samsung Monitor

Hey,
I just got a HDMI Samsung 27" monitor to connect to my Mac Pro. I set the setting in the system preferences to 1920x1080 like the monitor is, but it still streches things. It makes the circles into ovals. It also doesn't take up the whole monitor so it has black bars on each side. On the monitor there is no way to change this. I have heard that I might need to get a DVI to HDMI cord converter, but not sure.
Anyone know how to fix this?
Thanks!

The Video card use DVI and I downloaded your monitor's manual from here.
Look at section 3-1 about setting optimal resolution (which may be too late for you for that mentod).
Look at section 3-4, Standard Signal Mode Table.
Section 3-6 looks interesting about the on screen display (OSD) particularly Size & Position starting on page 3-7.
The specs on page 6-5 do confirm the max resolution for that monitor is 1920 x 1080.
So, I don't know.  Maybe you need to do something with that Size and Position setting with the monitor's OSD.
The video card uses DVI and the monitor uses HDMI so presumably you can use a DVI-to-HDMI adaptor or cable.  I think it shouldn't matter which you use.

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