ThinkPad W701: Win7 Ultimate x64 suddenly only saw 8GB RAM of 16GB (via: [H]ard|Forum)
Posted by jpluimers on 2013/04/10
This recently happened to me, but not sure when it started:
My ThinkPad W701 had 16GB of RAM, and everything worked fine for about 2 years, but now the BIOS and Windows only saw 8GB of it.
The odd thing: SpeedFan would see 4 memory modules of 4 gigabyte each for a total of 16 gigabyte.
This solution helped:
the easiest (and most embarrassing) fix worked – just took out the new RAM sticks and re-seated them into different sockets instantly fixed the problem.
The steps I followed:
- I removed the two 4GB memory modules that were easiest to reach (the ones on the bottom of the machine are easiest, the ones under the keyboard are way harder).
- Restarted the machine (forcing a reset of the cached BIOS Configuration Data): it still saw 8GB, and SpeedFan now too.
- Shut down the machine
- Reinserted the 4GB memory modules
- Restarted the machine (forcing another reset of the cached BIOS Configuration Data): now the BIOS, Windows and SpeedFan all saw 16GB of memory.