I've been looking for a cheap laptop for awhile to just do simple things with, and ended up finding this thing (Dell Inspiron 3135) at a store for $85 USD. I've since slapped a Samsung 850 evo I had from an old dead laptop and installed Manjaro Linux. I'm now looking at some other upgrades that I need to buy some parts online for but I have a few questions. 3 questions, with a few sub-questions.
1. I've been looking at RAM for this, and I found something by Crucial that crucial's site says is compatible, but when also looking up the same speed and type of DDR3L SO-DIMMs, I also found something by G.Skill that costs less and has a lower cas latency. I'm wondering if the timings need to match what is currently in my system for my motherboard to be compatible with it (laptops like these can be so selective about hardware) or can I get the ram with the better timings?
2. I've noticed the cpu sits around 48-52 Celsius in idle. I know it's normal for laptop CPUs to run kind of hot, especially since this thing is running an APU, but that still seems kind of high and the little fan on this thing is almost constantly running at max. I read something in its manual that suggested it had a thermal pad in it, rather than thermal paste. If so, would I be able to open it up and apply thermal paste or is a thermal pad too thick? I've never worked with thermal pads before. I've always used paste. Also, if I can use paste, should I use a normal decent quality thermal paste (like Noctua's or Thermal Grizzly Kryonaut) or, since it's a laptop CPU and therefor more than likely has an exposed die, should I go with something like thermal grizzly's conductonaut liquid metal or is it just not worth the risk (since gallium can damage the surrounding components)
3. The WLAN card in this laptop only supports up to Wireless N. It's not entirely necessary, but I do want to put in a wireless AC card in here at some point. As long as I find something that can fit into the mini PCI-E slot that's wireless AC capable (which I have found) would I have any trouble with compatibility?