The X series of laptops and convertible tablets are part of Lenovo's ThinkPad product line. Formerly an IBM brand, Lenovo acquired the ThinkPad brand following its purchase of IBM's Personal Computing Division (PCD) in 2005. The ThinkPad X series is traditionally the range best designed for mobile use, with ultraportable sizes and less power compared to the flagship ThinkPad T series. It was initially produced by IBM until 2005.
IBM announced the ThinkPad X series (initially the X20) in September 2000 with the intention of providing "workers on the move with a better experience in extra-thin and extra-light mobile computing." The ThinkPad X series replaced both the 240 and 570 series during IBM's transition from numbered to letter series during the early 2000s. The first X Series laptops were "slimmer than a deck of cards" and "lighter than a half-gallon of milk", despite the presence of a 12.1-inch Thin-film transistor (TFT LCD) display. These design values—thin and light—continued to be integral to the ThinkPad X-series laptops' design and marketing, even after the purchase of IBM's Personal Computing Division by Lenovo. The first X Series ThinkPad released by Lenovo was the X41 in 2005.
The ThinkPad X-series laptops from Lenovo were described by Trusted Reviews as "combining an ultraportable's weight and form factor with a durable design." The X-series laptop styles include traditional ultraportables, as well as convertible tablet designs. According to Lenovo, the ThinkPad X-series laptops include low power processors, offer long battery life, and several durability features such as a Roll Cage (Magnesium Frame around the Display), magnesium alloy covers, and a spill-resistant keyboard but currently lacks a replaceable battery and upgradable RAM slots.
Battery configuration
| Main
|
M(x)
|
Main hot-swappable
(max.cells)
|
Secondary
|
U
|
Ultrabay removable
|
| u
|
Ultrabay unremovable
|
| M(x)
|
Main removable
(max.cells)
|
m(x)
|
internal
(max.cells)
"PowerBridge"
|
| m(x)
|
Main internal
(max.cells)
|
S
|
Slice battery
|
Laptop color codes
|
|
Processor
Socketed desktop processor
Socketed mobile processor
Soldered high power processor
Soldered standard power processor
Soldered low power processor
Soldered ultra low power processor
Weight
| 0.9 kg (2.0 lb)
|
Up to 0.91 kg
|
| 1.0 kg (2.2 lb)
|
0.92–1.0 kg
|
| 1.1 kg (2.4 lb)
|
1.01–1.1 kg
|
| 1.2 kg (2.6 lb)
|
1.11–1.2 kg
|
| 1.3 kg (2.9 lb)
|
1.21–1.3 kg
|
| 1.4 kg (3.1 lb)
|
1.31–1.4 kg
|
| 1.5 kg (3.3 lb)
|
1.41–1.5 kg
|
| 1.6 kg (3.5 lb)
|
1.51–1.6 kg
|
| 1.7 kg (3.7 lb)
|
1.61–1.7 kg
|
| 1.8 kg (4.0 lb)
|
1.71–1.81 kg
|
| 1.9 kg (4.2 lb)
|
1.81–1.91 kg
|
| 2.0 kg (4.4 lb)
|
1.91–2.03 kg
|
| 2.1 kg (4.6 lb)
|
2.04–2.14 kg
|
| 2.3 kg (5.1 lb)
|
2.15–2.4 kg
|
| 2.5 kg (5.5 lb)
|
2.41–2.75 kg
|
| 2.8 kg (6.2 lb)
|
2.76–3.05 kg
|
| 3.1 kg (6.8 lb)
|
3.06–3.42 kg
|
| 3.5 kg (7.7 lb)
|
3.43–3.99 kg
|
| 4.0 kg (8.8 lb)
|
4.0–4.99 kg
|
| 5.5 kg (12 lb)
|
5.0–6.49 kg
|
| 7.2 kg (16 lb)
|
6.5–7.99 kg
|
| 9.1 kg (20 lb)
|
8.0–9.99 kg
|
| 10.7 kg (24 lb)
|
10–11.99 kg
|
| 12.7 kg (28 lb)
|
12–14.49 kg
|
| 14.5 kg (32 lb)
|
14.5–17.99 kg
|
| 18.1 kg (40 lb)
|
18–20.99 kg
|
| 21.7 kg (48 lb)
|
21–23.99 kg
|
| 24 kg (53 lb)
|
24–28.99 kg
|
| 29.5 kg (65 lb)
|
29 kg and above
|
|
Screen resolution
4K or higher
1440p+ (WQHD,QXGA)
1080p+ (Full HD,UXGA)
Better than 768p (SXGA,SXGA+)
600p+ (SVGA,HD,XGA,HD+)
Up to 600p (VGA)
Graphics
Dual standard socket graphics option
Dual proprietary socket graphics option
Standard socket graphics option
Proprietary socket graphics option
Soldered performance graphics option
Soldered midrange graphics option
Soldered mainstream graphics option
Soldered entry graphics option
Integrated entry graphics
Integrated basic graphics
|
Laptop storage combinations (excluding WWAN slot)
| Level
|
PCIe 4.0 x4
|
PCIe 3.0 x4
|
PCIe 3.0 x2
|
M.2 SATA
|
mSATA
|
1.8" SATA
|
2.5" SATA
|
1.8" IDE
|
2.5" IDE
|
|
|
2019
Not yet
(laptops)
|
2013
|
2013
|
2013
|
2009
|
2003
|
2003
|
1991
|
1988
|
|
|
3
|
|
2
|
|
|
|
4
|
|
| 3
|
|
1
|
|
| 2
|
|
2
|
|
| 3
|
|
2
|
|
|
|
3
|
|
| 2
|
|
1
|
|
| 4
|
|
| 3
|
|
1
|
|
| 2
|
|
2
|
|
|
|
2
|
|
| 1
|
|
1
|
|
| 3
|
|
| 2
|
|
1
|
|
|
|
1
|
|
| 2
|
|
| 1
|
|
1
|
|
|
|
2
|
|
1
|
|
|
|
4
|
|
|
|
|
1
|
|
|
|
1
|
|
1
|
|
|
|
3
|
|
|
|
|
1
|
|
|
|
1
|
|
1
|
|
|
|
1
|
|
1
|
|
|
|
1
|
1
|
|
|
|
2
|
|
|
|
3
|
|
|
|
1
|
|
|
|
1
|
|
|
|
2
|
|
|
|
1
|
|
|
|
1
|
Laptop memory
| Amount
|
LPDDR5X
|
LPDDR5
|
DDR5
|
LPDDR4X
|
LPDDR4
|
DDR4
|
LPDDR3
|
DDR4
|
DDR3L
|
DDR3
|
DDR2
|
DDR
|
SDR
|
EDO
|
FPM
|
|
|
|
|
|
|
dual channel
|
|
< dual channel
|
dual channel
|
< dual channel
|
dual channel
|
< dual channel
|
dual channel
|
< dual channel
|
|
|
|
|
2022
(laptops)
|
2019
(laptops)
|
2020
|
2017
|
2014
|
2014
|
2012
|
2014
|
2010
|
2007
|
2003
|
1998
|
1993
|
1993
|
1987
|
| max memory = 512 GB
|
N/A
|
N/A
|
512 GB
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
| max memory = 256 GB
|
N/A
|
|
256 GB (4 slots)
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
| max memory = 128 GB
|
128 GB
|
|
128 GB
|
N/A
|
N/A
|
128 GB (4 slots)
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
| 64 GB ≤ max memory < 128 GB
|
|
64 GB
|
|
N/A
|
N/A
|
64 GB
|
N/A
|
64 GB (2 slots)
|
64 GB (4 slots)
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
| 32 GB ≤ max memory < 64 GB
|
|
|
|
32 GB
|
32 GB
|
32 GB
|
N/A
|
|
32 GB
|
32 GB (2 slots)
|
32 GB (4 slots)
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
| 16 GB ≤ max memory < 32 GB
|
|
|
|
|
|
16 GB
|
16 GB
|
|
16 GB
|
|
16 GB
|
16 GB (2 slots)
|
16 GB (4 slots)
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
| 8 GB ≤ max memory < 16 GB
|
|
|
|
|
|
8 GB
|
|
|
8 GB
|
|
8 GB
|
|
8 GB
|
8 GB (2 slots)
|
8 GB (4 slots)
|
N/A
|
N/A
|
N/A
|
| 4 GB ≤ max memory < 8 GB
|
|
|
|
|
|
4 GB
|
|
|
4 GB
|
|
4 GB
|
|
4 GB
|
|
4 GB
|
4 GB (4 slots)
|
4 GB (4 slots)
|
N/A
|
| 2 GB ≤ max memory < 4 GB
|
|
|
|
|
|
2 GB (8 chips)
|
|
|
2 GB
|
|
2 GB
|
|
2 GB
|
|
|
2 GB
|
2 GB
|
N/A
|
| 1 GB ≤ max memory < 2 GB
|
|
|
1 GB (1 chip)
|
dual channel min
|
dual channel min
|
N/A
|
|
single channel min
|
1 GB
|
|
1 GB
|
|
1 GB
|
|
|
|
|
1 GB (4 slots)
|
| 512 MB ≤ max memory < 1 GB
|
N/A
|
N/A
|
N/A
|
single channel min
|
single channel min
|
N/A
|
dual channel min
|
half channel min
|
512 MB (8 chips)
|
|
512 MB (8 chips)
|
|
512 MB
|
|
|
|
|
512 MB
|
| 256 MB ≤ max memory < 512 MB
|
N/A
|
N/A
|
N/A
|
256 MB (1 chip)
|
256 MB (1 chip)
|
N/A
|
single channel min
|
256 MB (1 chip)
|
N/A
|
single channel min
|
N/A
|
single channel min
|
256 MB
|
|
|
|
|
|
| 128 MB ≤ max memory < 256 MB
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
128 MB (1 chip)
|
N/A
|
N/A
|
half channel min
|
N/A
|
half channel min
|
|
|
|
|
|
|
| 64 MB ≤ max memory < 128 MB
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
64 MB (1 chip)
|
N/A
|
64 MB (1 chip)
|
|
|
|
|
|
|
| max memory < 64 MB
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
N/A
|
|
|
|
|
|
|
|