It is unclear from your question if you are asking about the RT or Pro, regardless, both are sealed systems and I highly doubt user upgrades are available. Ready-boost is in ineffective on any system with a SSD and typically the system will not enable it on removable media. You can use the Micro-SD card to expand storage though.
The RT (ARM) device has 2GB RAM and the Pro (Intel x86 Core i5) has 4GB RAM.