This one definitely fits in the “don’t try this at home” category unless you’re a bit tidy with a soldering iron. Taking out the old Core Solo chip in the tiny Vaio UX and replacing it with Core Duo ain’t easy, but it is possible.

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Sony was making teeny weeny laptops long before Asus found it had a surplus of vowels in the storeroom at the back. As titchy as its Vaio UX is, though, it does have an annoying design flaw - the oversize plug prevents it sitting straight when it’s running on mains power. Unless, that is, you’ve got a low profile adapter.

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