A:AnswerOnly one NVMe PCIe 3, 4 lane slot. Internal images can be seen in the part locator. Note this document show both the Intel ed000 and the AMD ee000 models. http://h10032.www1.hp.com/ctg/Manual/c06584306
A:AnswerThe memory, SSD (NVMe PCIe 3 x4) and WiFi card are all replaceable/upgradable. Instructions in service manual
http://h10032.www1.hp.com/ctg/Manual/c06618426
Part locator http://h10032.www1.hp.com/ctg/Manual/c06584306
A:AnswerIt is only specified as AMD Radeon Graphics. If you look up the processor on Radeon's site you can see the details of the chip and it's specs:
https://www.amd.com/en/products/apu/amd-ryzen-7-4700u