A:AnswerFrom what I learned from research, yes the memory is expandable. In regards to the SSD. If you have the Signature Series with a "1" in the last 4 digits of the model number it has a high performance Samsung PCIe- 3.0x4, NVMe M.2 SSD. NOTE: All 900's have same specs. The ram/memory is also 1866 vs 1600 in other 900's with different model numbers
I tested the SSD speed using Crystal Disk Mark though I don't have the result commited to memory the read speeds were in excess of 850MB/sec and write speeds were in excess of 600MB/sec. Those results are significantly faster than my Samsung 850 EVO 500GB SSD in my high performance desktop pc.
A:AnswerAll work on this system must be completed by a certified technician so as to not void the warranty. Yoga 900-13, model number, 80UE00D1US, the model linked to your question, has a Samsung MZNLN256HCHP M.2 256GB SSD.
A:AnswerNo, this system has a USB-C port that carries HD video and audio like HDMI-Out. If you want to connect this device to an HDMI port, you will need a USB-C to HDMI adapter. Here is a link to an example of this adapter:
http://www.bestbuy.com/site/insignia-usb-type-c-to-hdmi-adapter-white/4480802.p?skuId=4480802
