450m SNR Question

I understand that the product literature gives the required SNR to achieve a certain modulation. I wanted to know, is this for a 40mhz wide channel or does it apply to all channels widths? I'm more interested in knowing the SNR for a 20mhz channel.

For clarification, the listed SNR and modulation table looks like this from the product literature:

Modulation Level MCS SNR Required
2x QPSK 10
4x 16QAM 17
6x 64QAM 24
8x 256QAM 32

 

Hi, this applies to all channel widths.