Below are the memory usage test result using build 940 and 945 on Marine and HF frequency band.

                                                                                           Build 940        Build 945 (on 28 October 2017)
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Test using 8 RX on Marine band (NFM mode):  156.55 MHz, 156.625, 156.67, 156.725, 156.765, 156.572, 156.6

    Band width =  1 MHz                       
        Memory usage (shown on SDR Console):                    843 M          650 M
        Memory usage (shown on Windows Task Manager):    1.3 G           904 M

    Band width =  2 MHz
        Memory usage (shown on SDR Console):                     847 M         809 M
        Memory usage (shown on Windows Task Manager):     1.3 G          1.1 G

    Band width =  4 MHz
        Memory usage (shown on SDR Console):                     883 M         850 M
        Memory usage (shown on Windows Task Manager):     1.3 G          1.1 G

    Band width =  8 MHz
        Memory usage (shown on SDR Console):                      950 M        970 M
        Memory usage (shown on Windows Task Manager):      1.3 G         1.2 G

P.S.  Build 945 crashed when 20 RX open at 8 MHz bandwidth.

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Test using 8 RX on HF band (AM mode):  11640 kHz, 11670, 11720, 11760, 11785, 11825, 11840, 11860

    Band width =  1 MHz                       
        Memory usage (shown on SDR Console):                    911 M        600 M
        Memory usage (shown on Windows Task Manager):    1.4 G        807 M

    Band width =  2 MHz
        Memory usage (shown on SDR Console):                     903 M        623 M
        Memory usage (shown on Windows Task Manager):     1.3 G        828 M

    Band width =  4 MHz
        Memory usage (shown on SDR Console):                     948 M        654 M
        Memory usage (shown on Windows Task Manager):     1.4 G        861 M

    Band width =  8 MHz
        Memory usage (shown on SDR Console):                      1009 M        721 M
        Memory usage (shown on Windows Task Manager):     1.4 G        909 M

P.S.  For testing using 8 RX on HF band, build 940 crashed when 10 RX opened at 8 MHz bandwidth while build 945 still operate with 20 RX opened at 8 MHz bandwidth.