Hi all,
I'm considering buying an X240, mostly because of the screen resolution. One downside of the X240, is that it only accepts 1 single SODIMM, which to now were only available up to 8GB sizes. I do need more than that to process the datasets I use.

1. No, I have that laptop as one of my daily laptops and I upgrade a lot. There is only a single SO-DIMM DDR3L 1600 MHZ ram slot. There are are some 16 GB single SO-DIMM DDR3L RAM But I would not recommend that because sometimes there not stable.
2. Sell x240 and buy one of these notebooks many are available up to i7 and two memory slots. Even the newest x series is still 1 slot. Best thing for 12.5' notebooks are with my preferred choices on M.2 slots over mPCIe. HP EliteBook 820 G3 skylake 12.5' 2x memory slots DDR4, M.2 NVMe-SSD OR SATA (requires a 2.5' caddy).
3. Lenovo ThinkPad X240 is a Windows 7 laptop with a 13.30-inch display that has a resolution of 1366x768 pixels. It is powered by a Core i7 processor and it comes with 8GB of RAM.

Click to Enlarge With its 1.6-GHz Core i5-4200U CPU, 8GB of RAM and 256GB SSD, our configuration of the Lenovo ThinkPad X240 offers performance that's good enough for even the most demanding. The ThinkPad X240 sure packs a ton of features in its diminutive form factor, but this rig comes right up against good old physics. For one, Lenovo couldn't have crammed another port.

Thinkpad X240 Laptop Memory Upgrade

Has anybody tested these? Does the BIOS allow for 16GB?
http://www.intelligentmemory.com/dram-m ... 3-so-dimm/
They appear to have a module code IMM2G64D3(L)SOD8AG which appears to be the first 16GB, and can do DDR3-1600. They may become available by mid April at $300

Thinkpad X240 Memory Slots Upgrade

This post suggests it won't work...
http://hardforum.com/showthread.php?t=1797721
On the other hand, it was 'undocumented' that 2 8GB sticks could be used in X2xx series back in the day..
Adding a bit more info
A person from intelligentmemory says that a Haswell machine will not work with these chips, unless a change of the memory reference code, which is part of the BIOS. It is not yet 100% sure if it can be fixed by a BIOS update or not. On March 10, 2014, they did have a customer make it work on an Ivybridge E by modifying the memory reference code. Lenovo could work with Intel, and change this code.
Any ideas? Any Lenovo and/or Intel folks around?
Best
sancat

Definition Of Memory Slots

ThinkPad X240 This page gives an overview of the ThinkPad X240 (machine types 20AL and 20AM). Features Dimensions: 305.5 mm x 208.12 mm x 20.3 mm Weight: 1.36 kg Features: One of the following Haswell processors (all 15W TDP ultra low voltage): Intel Core i7-4600U (2.1 GHz / 3.3 GHz Turbo, 2 cores, HyperThreading, 4MB cache) Intel Core i5-4300U (1.9 GHz / 2.9 GHz Turbo, 2 cores, HyperThreading, 3MB cache) Intel Core i5-4200U (1.6 GHz / 2.6 GHz Turbo, 2 cores, HyperThreading, 3MB cache) Intel Core i3-4010U [1.7 GHz, 2 cores, HyperThreading, 3MB cache) Intel HD4400 Graphics integrated into CPU Up to 8GB of RAM (PC3-12800 DDR3L SDRAM 1600MHz SODIMM) in a single socket One of the following TFT displays: 12.5' HD (1366 x 768) 12.5' HD IPS (1366 x 768) 12.5' HD IPS Touch (1366 x 768) 12.5' FHD IPS (1920 x 1080) 12.5' FHD IPS Touch (1920 x 1080) 2.5' × 7mm hard drive bay with one of the following hard drives: HD 320GB (7200 rpm) OPAL 1TB (5400 rpm) 500GB (7200 rpm) SSD 128GB / 512GB SSD SATA3 Intel® 180GB SSD SATA3 256GB SSD eDrive (OPAL 2.0) M.2 slot with, optionally, one of the following: 16GB SSD (SATA 42mm M.2 NGFF, type 2242) Ericsson N5321 WWAN 'Integrated Mobile Broadband' - Gobi 5000 (Sierra Wireless EM7355) WWAN 'Integrated Mobile Broadband' Display connectors Mini DisplayPort port with audio VGA port 3.5mm Headphone+Mic combo jack 2 x USB 3.0 ports, one of which is 'Always on' for power 4-in-1 SD card reader (SD / SDHC / SDXC / MMC slot) Smart card reader (optional) Ethernet: Intel® 82577LM Gigabit (Hanksville) Wireless, one of the following: Intel Dual Band Wireless-AC 7260 (2x2, 802.11ac/a/b/g/n, BlueTooth 4.0) Intel Dual Band Wireless-N 7260 (2x2, 802.11abgn, BlueTooth 4.0) NFC Transmitter 720p HD Integrated camera Batteries: Internal (front) battery: 23.2Whr 3 cell Li-Polymer (optional) External (rear) battery: one of 23.2Wh 3 cell Li-Polymer (Type 68) 72Wh 6 cell Li-Ion (Type 68+) External battery can be swapped while running on the internal battery ('Power Bridge') Kensington lock Integrated Fingerprint Reader (optional) VGA connector Compatible docking stations:

RAM upgradability

This model has a single SODIMM socket, which supports up to 8GB of RAM (PC3-12800 DDR3L SDRAM 1600MHz SODIMM).

The CPU does not support more than 8GB of RAM per SODIMM module. In particular, Linux and Windows fails to boot, and MemTest86+ crashes, when using a 16GB SO-DIMM module, model IMM2G64D3LSOD8AG-B15E from Intelligent Memory (which does work in a ThinkPad X250).

Disassembly

Any internal component replacement or upgrade (including hard disk and expansion cards) requires opening the back cover. Keyboard replacement requires full assembly and disassembly of the system board, and fresh thermal paste for the CPU heatsink.

Opening the case involves two stages:

• Opening a handful of screws (these have tiny retainer rings made of transparent plastic; be careful not to drop them when removing the back cover).
• Carefully prying apart dozens of little fragile plastic latches. This requires a plastic case opening tool to avoid damage (a metal screwdriver will nick and scratch the plastic).

Key mapping

This model has a 6-row keyboard, where the F1 through F12 share the same top-row physical keys with special functions keys (volume, brightness, etc.). By default, the top-row keys invoke the special functions, and require Fn keypress to invoke the usual F1 through F12 functions. To switch the role and have the top-row keys default to F1 through F12, enable Fn-Lock mode (by pressing Fn+Esc).

Moreover, End and Insert share the same physical key. When Fn-Lock is activated, the key default to Insert, and End is invoked as Fn+Insert, which many users find inconvenient. To switch the End and Insert functions, in modern Linux distribution, add the following in a new file /usr/lib/udev/hwdb.d/61-ThinkPad-X240-keyboard.hwdb:

Then run:# udevadm hwdb --update

(The keyboard:... line matches /sys/devices/virtual/dmi/id/modalias, and the hex scancodes are found using # evtest /dev/input/by-path/platform-i8042-serio-0-event-kbd . )

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