What are compatible power adapters for the W520 and W530? I want to ensure that I have adequete power to my GPU and CPU. I know lower wattage adapters sometimes seem to work but I want to make sure I'm not damaging my Thinkpad.
As a rule of thumb, dual core model uses 135 watts, quad core model uses 170 watts.
If a lower wattage adapter works, it may not charge the battery and could severely limit or throttle the CPU.
It is generally acceptable to use a higher wattage than needed adapter - i.e. a 170w adapter with systems that would otherwise only need a 90w, or a 90w, where a 65w is typically used. However, it is strongly recommended that adapaters with less than required wattages not be used.