Hi Ethan,
Since you bought the board last year, it has the LMX2531 on it; the LMX2541 is a recent update, but the LMX2531 actually performs better, so that is good for you.
From the FFT Readouts tab, the SNR = 58.67dBFS. Since the part is in DESI Mode, the Nyquist zone covers 1.8GHz, so the calculated NSD is:
-SNR - 10*log10(NyquistBW) = -151.22dBFS/Hz
From the datasheet, the typical NSD = -154dBFS/Hz. 2.8dB is more than I expect missing in chip-to-chip performance variation. Out of curiosity, how does DESQ Mode perform?
Kind regards,
Marjorie