Taken from the paladin pawn thread: http://elitistjerks....ins/#post984821
1. Each rating is relative only to itself.
Some pawn users assume that if they have two strings, that the rating that has the higher value is what the gear is better for. This is NOT the case. You should only use a rating to compare two items together, rather than using ratings to determine what an item is better for. (Note: This rule can be counterfeit, but that requires balancing points, something I'll get to later)
2. A rating that gives you numbers in the 100's is no better or worse than one that gives you points in the 10,000's
Remember, this is a relative comparison tool. So 900 - 1000 may be better than 90,000 to 95,000.
Also, raid buffs, gear, and talents will change the values and generally reduce precision.
EDIT: if you post a pawn string, please ensure that it's supported by data from the DPS spreadsheet.