In use for 2 months, I bought a lenovo ideapad 330-15ikb for my laptop. Regular stood at 2 GB and soldered 4 GB. At first I wanted to take 8 GB, but then I decided to set it up like this - I put this one on 16 GB and in general it turned out 20 GB. At the moment, only 9 GB was used as much as possible, because I think that an 8 GB stick would be enough (in general, 12 GB together with a soldered one), but it's nice to have a margin that also allows you to run live wallpapers on your desktop without losing performance. On installation, I simply inserted it instead of the old one (I first disconnected the battery) and turned it on - the computer itself recognized it and put it into operation. The dual-channel mode works (but of course only for 4 GB - as it is soldered on the board), I bought another 240 GB Crucial BX500 SSD and the laptop began to fly. According to subjective feelings, the battery life has increased, enough for 4 hours of work in the browser and in Excel and Word documents. I think if you stick a fresher battery it will be better, but for now 4 hours is enough.
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