Someone asked last night about how much power the RT-IHU (as seen in the picture) drew.  I said something like 300ma.  I worked on it today and was able to determine more accurately that the answer is about 200ma (198 really).  I did that by turning on my whole board stack and then sending an uplink command to power down the RT-IHU and taking the difference in power use.  That includes both  AX5043s powered, with one receiving, but the other not transmitting.

As to the speed, the oscillator crystal is 16MHz, with an internal PLL bringing it up to 160MHz, which as I read it is the max supported on the TMS570LS0914 processor on that board.  It has 1Megabyte of flash program memory and 128KB of RAM (both have ECC).  It also has 64KB of data EEPROM with ECC (but we have made a point not to write to flash/prom in orbit just in case it wiped the flash program memory).

And finally, the MRAM is Everspin MR25H40, which is 4megabits, that is 512Kbytes.  That appears to be the largest available with this model line, although they are introducing a new model line that goes up to 64megabits.  I don't know anything about compatibility, although they claim to use SPI interfaces as well.