Ah, right. Here's what it's supposed to look like, when I use 16:9 mode and my normal resolution:
http://imageshack.us/photo/my-images/210/ssnormal.jpg/
And here's what it looks like with 4:3 mode and 1280x960:
http://imageshack.us/photo/my-images/845/ssborders.jpg/
I couldn't see any difference using widescreen hack and/or crop, so I didn't include a screenshot using those since it'd be identical. And in case it matters, I'm using Direct3D9, but I tried Direct3D11 as well with no difference.
http://imageshack.us/photo/my-images/210/ssnormal.jpg/
And here's what it looks like with 4:3 mode and 1280x960:
http://imageshack.us/photo/my-images/845/ssborders.jpg/
I couldn't see any difference using widescreen hack and/or crop, so I didn't include a screenshot using those since it'd be identical. And in case it matters, I'm using Direct3D9, but I tried Direct3D11 as well with no difference.