I have concluded that my office is in sore need of a new display and have decided to take the hit for one of apple's refurbished displays. The most important thing for me is similar pixels/square inch (so that the same size font shows up the same size on each monitor). Is there a screen-definition difference between the most recent MacBook Pros and any of the currently available cinema displays on Apple's site? I could not find any such specs in the product descriptions.
Image quality of various Apple cinema displays
cinema-displaydisplay
Related Solutions
Your calculation is solid. Everywhere I've seen it 109 PPI (which is probably what you intend with DPI) is what people report for the Thunderbolt Cinema Display:
The TUAW article has this nice picture to catalog various pixels per inch densities:
The linked article above even has a Google-hosted spreadsheet with details on the data behind the table.
You ABSOLUTELY can do this.
The statement on the box is wrong. You can use either two mini-display port to displayport cables, or two Thunderbolt cables.
My statement was based on the fact that you can (according to Apple's documentation) run two Thunderbolt monitors on that laptop, and the available resolution on the Thunderbolt cable is clearly capable of 3440x1440.
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Best Answer
Using this calculator, I discovered that the following:
24" cinema display has 94 PPI
27" cinema display has 109 PPI
30" cinema display has 100 PPI
15.4" MacBook Pro has 110 PPI
Thus the 27" is going to be the closest PPI to my current display.