• I learnt that X240 has 2 slots for M.2 SSD. One is occupied by a 16GB SSD cache drive (this is what I find in my device manager) and the other is for WIFI card. I wanna replace the 16G SSD with a new SSD as windows drive, keep the HDD and upgrade to 8GB ram as 16GB is not supported.
• 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).

• Lenovo X240 Memory Slots Free
• Lenovo X240 How Many Memory Slots

The Lenovo ThinkPad X240 is a powerful business laptop sporting a Core i5 Haswell CPU, a speedy solid-state drive, and a 12.5-inch IPS touch-screen display. You'll pay top dollar for this well.

Hi guys,
I got a few questions regarding upgrade of my X240. I learnt that X240 has 2 slots for M.2 SSD. One is occupied by a 16GB SSD cache drive (this is what I find in my device manager) and the other is for WIFI card. I wanna replace the 16G SSD with a new SSD as windows drive, keep the HDD and upgrade to 8GB ram as 16GB is not supported.
My questions are:
1. Is it any 2242 m.2 SSD with be OK? Which model is crecommended? 128GB or 256GB?

Lenovo X240 Memory Slots Free

Lenovo X240 How Many Memory Slots

2. Some said the slot is for cache drive only. Is it really OK use it for windows drive?