I got a surprise when I replaced an rb951g with an CRS125-24G-1S-2HnD-IN - I thought they would be quite similar in regards to wlan. They were set up as wlan stations connecting to a cisco ap several buildings away. While the rb951g had a signal to noise ratio of 24-28dB (depending on weather) and gives a link quality good enough to stream video, the crs125 could barely get a successful ping over the link, and showed a signal to noise ratio at 13dB at the best antenna position I could find, and just 8-10dB once I moved the antennas a tiny bit away from the best position. The rb951 I can move around quite a bit without loosing SN-ratio.

I also tested a hAPac, using the 2ghz radio, it performed about the same as the rb951g,

Is this an expected difference between the these models?