unraid box cpu choice
To answer the question, the E5520's are going to have one hell of a time keeping up with the R9's. 2.53GHz at that generation's IPC is rough going. If you're going to look for comparative benchmarks you'll need to look back at original core i series (probably the i7-820 is the closest in the lineup to the E5520's). Just keep in mind that on turbo at least one of the cores has a full GHz leadout on the Xeon. If you can hunt down some benchmarks with turbo disabled that would be about as close of a comparison as you can get.
The closest thing to this that I have direct experience with was my old i7-980X @4.147GHz. It ran nearly every title extremely well paired with a GTX 770, but I mostly played AAA titles when that thing was around (FC3, BF3/4, AC:BF, etc.) It ran like dog shit with unoptimized games (PS2, ARMA 2/3, etc) but really, even my Haswell CPU's sometimes shit the bed on certain places with those games (to a much lesser degree on my 1440p panel now).

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