You no longer can go by what is posted on the nookdev site. It is seriously out of date. There have been nooks with 1.4.3 firmware that have had the older socket chip, and once you have 1.5, there is no way short of removing the back to tell what chip is on the board.
If it was mine, I would wait until nookdev updates their info. 1.5 is worth it and 2.5.1 has multiple bugs which can be frustrating for a new softrooter. In the mean time, consider removing the back to see what you have.
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