I see things a little differently than others. Sometimes this leads to helpful solutions. Occasionally I manage to over complicate things. Regardless I always try to be open to other viewpoints. I figure your viewpoint is probably as valid as mine.
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iPhone 4S Pentalobe Screws
16GB of RAM for the T420s
Lenovo ThinkPad T420s RAM
"How can I install more RAM?"に関する回答You may need the most recent BIOS update but the T420s supports 16GB of RAM, not 8 as previously (and correctly at the time) published. You can use RAM that is faster than 1333 MHz, but it will not use a faster speed than 1333 MHz.