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Thanks - I'm happy with spending £130 on the MX500 if it all works! Just a bit concerned with the temperature sensor problem. Looks like one of these things thats recognised ("If your fan stays on maximum then you may have an issue with your temperature sensor...") but has no clear resolution (numbers of comments reporting the issue, asking then what they should do, but no answer)
Ah f*** it, I'll give it a go. The worst that can happen is that I have to revert back to the hdd, find someone competent and/or flog the ssd at a loss
cookiemonster-
I read the ifixit guide and I can see why you want to pay someone to do it - I would too.
According to that guide you can put a second drive in, so if I was you I'd pay someone to install the MX500, leaving the 1Tb hard drive in there for storage.
You'd then have the option of turning them into a fusion drive, but you have to wipe both drives to do that.
Fox
I don't know about the issues with temperature sensors but the MX500 is one of the fastest SSDs around at the moment for the money (the other being the Samsung 860 Evo which is more expensive). Both work with Macs.
Your obvious problem is you're going to lose storage space unless you shell out for a 1Tb SSD.
I'd normally say get a SSHD/hybrid drive but Firecudas are the only real option I know of at the moment and they don't have a good reputation for reliability...
https://smile.amazon.co.uk/Seagate-ST1000LX015-FireCuda-Internal-Factor/dp/B01LXNUKKW/ref=sr_1_3?ie=UTF8&qid=1547543600&sr=8-3&keywords=firecuda+1tb+2.5