I'm using a 6 year old laptop that came with Vista and 3GB of RAM. I did a clean install of Win8 Pro and Office 2013 (local install). And, I'm running a second monitor.
I have no problem with blurry display in Office 2013.
FYI I do have "Optimize character positioning for Layout rather than readability" AND "Disable Hardware graphics acceleration" both
**turned off.**I do have "Use subpixel positioning to smooth fonts on screen" **turned on.**And, I did use the Win8 "Adjust truetype fonts" tool.
I think that you have to find the combination of 3 options that works best for your system, and the truetype adjustment certainly didn't hurt.