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My 2012 15" retina MBP is still holding up very well. It looks like new, and it's still as fast as when I bought it for what I do with it. I wish that my employer would let me use it as my work machine instead of this Windows laptop.
 
I think it’s thermals. I ran my laptop at full load often enough that the it’d be drawing the full 85w frequently and that cable would get hot. The cable then starts to discolor and eventually breaks down.
Possibly, my needs are very humble, and I know I'm wasn't hammering the machine very hard, where as my kids are running apps (and games) that is pushing the temps.
 
Are genuine batteries for 2012 still sold?
This may be a bit of $$$ to invest.
3rd party clones are not very good from my experience.
Not a direct answer to your question but I just got my 2012 15' cMBP battery replaced in Apple Store one month ago...
 
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I still rock mid-2012 Macbook Pro 13" for lightweight jobs. Some bad pixels on the display. Hinge is a little bit loose, but not unacceptable. It's overall really great considering everything this machine has went through.

Feel free to ask me anything you'd like and I'll check for you.
 
Still rocking my rMBP 2012 15" top spec here as my daily driver. Battery swollen after 7 years and got a cheap replacement through some used parts. Hooked it up with a RX580 eGPU (TP3->TP2>TP1 setup) and it is capable to edit video and run some modern games.
 
It's not always yellow mate! :) You have white cheese (like a goat cheese), blue cheese etc. Try those, they're quite good!
Apple should hire you, you’re better than Siri! 🤣
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A year newer but the 2013 retina 15” (16gb, 512SSD) that I bought new has been rock solid, I’m a freelance print designer and it’s my only computer. I use it daily, of course it sits at home on my desk 90% of the time- that may have a lot to do with the longevity. I just ordered a new 16” but thinking of canceling because I really can’t pinpoint why I need a new one right now, mine just keeps doing everything so well, Catalina runs perfectly also. Replaced battery last year after seeing it done on YouTube. Bought battery through Ifixit (Didn’t trust the no-name brands on Amazon, etc).
 
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My son is still using a 2012 15" and it's rock solid. I forget offhand what OS he has; I use Mojave.

In your case, I don't recall your saying if it is a 13" or 15", but I'd be inclined to put 16 GB of RAM and a 1 TB SSD in it, install Mojave, and use it until it just won't do what you need it to any longer.
 
My 2012 MBP is running great on .15.3, 2TB SSD and 16Gb ram. Thinking about getting another to Raid 0 and have insane R/W's
got one 2012 MBP 13" still very solid performer, got it setup as RAID_0 APFS with latest Catalina 10.15.3 and its pretty quick.
RAID_0 Catalina.png
 
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Do you still have to use single user at every boot? Updates still have to be cloned?

I love Raid 0's I have a MB 7,1 in a R0 and it almost doubled the RW's.
nope, no cloning, it boots normal, you do have to move bootcaches.plist after you update the system.
 
nope, no cloning, it boots normal, you do have to move bootcaches.plist after you update the system.

Just a normal APFS format and install? Or did you use DosDudes patcher to override the R0
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Just a normal APFS format and install? Or did you use DosDudes patcher to override the R0

Where do you move the .plist to?
 
Just a normal APFS format and install? Or did you use DosDudes patcher to override the R0
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Where do you move the .plist to?
2012 MBP fully supported so no Dosdude patcher needed , use terminal to create a raid0, create a gpt and format it APFS, install Catalina, right the very end of installation, you get "bless" error, move or rename bootcaches.plist to bootcaches.bak before rebooting, installation will finish.
 
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2012 MBP fully supported so no Dosdude patcher needed , use terminal to create a raid0, create a gpt and format it APFS, install Catalina, right the very end of installation, you get "bless" error, move or rename bootcaches.plist to bootcaches.bak before rebooting, installation will finish.
I’ll have to give it shot, I have a spare 2TB Samsung SSD left over from a old Hack, I’ll have to give it a shot with my 2TB MX500 in my 12
 
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