There is one slot for DDR3L, which can be upgraded to a maximum of 8 GB.
HP x360 Convertible (Model 11-ab005tu)
(Year released: 2017)
Intel Pentium N3710
1.6 GHz, up to 2.56 GHz, 2 MB cache, 4 cores
Memory: 8 GB DDR3L-1600 SDRAM (1 x 8 GB)
Hard Drive: 5400 rpm 500 GB SATA
Intel HD Graphics 405
11.6" diagonal HD SVA anti-glare WLED-backlit touch screen (1366 x 768)
Intel® 802.11a/b/g/n/ac (1x1) Wi-Fi® and Bluetooth® 4.2 Combo (Miracast compatible)
Pointing Device: HP multi-touch gesture support
Ports
1 HDMI
1 headphone/microphone combo
2 USB 2.0
1 USB 3.1
Battery: 3-cell 41 Wh Li-ion
Weight: 1.45 kg