Edit to add: Here are some images of what the internals of the single bay My Clouds look like from a HardwareSecrets.com article on a 3T My Cloud unit.
No idea on the memory. About all I can find is this web page from 2013 that indicates the following (don’t know how accurate it is):
My Cloud uses a Mindspeed Comcerto 2000 (M86261G-12) dual-core ARM Cortex-A9 Communication Processor running at 650 MHz. The Gigabit Ethernet port is a Broadcom BCM54612E Gigabit Ethernet Transceiver. Other components include 256 MB of Samsung K4B2G1646E DDR3 RAM and 512 MB of Winbound 25X40CL flash. The drive is a WD Red 2 TB (WD20EFRX).