if I'm understanding you correctly, you're suggesting a: 2015 Model MBP with "discreet" GPU, maximum RAM and inherent upgradeable/modifiable storage.
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Basically yes if you wanted no compromises the fasted CPU, GPU and storage MJLU2LL/A*
the reasons i mention upgradable storage is if your technically inclined and want to upgrade the storage yourself it is possible for any Retina Macbook Pro 2012 through 2015. (guides are on youtube and the internet)
and when doing my own searches online over the years I found that many used Macbook Pro's have the drives pulled because people keep there data and sell off the rest of the machine.
so for example you may find a MJLU2LL/A* with the 1TB SSD already removed or downgraded to a smaller size and its cheaper to get a m.2 ssd and 15$ adapter to give it storage again then buy a used 1tb model that someone pulled from there MJLU2LL/A*
that was the case with mine it was a MJLU2LL/A* and someone swapped the 1tb drive for a 256gb so they could keep there data,so i got the laptop cheaper than it would have been listed if it had it original drive and rather than paying $1200 Canadian for a replacement 1tb someone pulled from there MJLU2LL/A* I spent less than that on a 2tb m.2 drive and a 20$ sintech m.2 adapter.
What I think I additionally need to grasp better is what you mean when you say model. I suspect that translates to "MGXG2LL/A", "MJLT2LL/A", etc. for example.
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I say “2015 model” as in the 2015 category of retina MacBook pros in general, rather than name a specific apple identifier for a specific laptop "MGXG2LL/A", "MJLT2LL/A", etc. for example.
primarily i do this because everyone use case is different and what i need isn’t necessarily what you need so i rather educate on the differences so people can weigh the pros and cons of the choices for themselves.
if i didn’t say “2015 model” and just said “retina MacBook pro” I could mean any machine from 2012 to 2015 even though they have differences in CPU, GPU and SSD speed.
so I guess my question is what specific model designation is your 2015 system.
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I have a MJLU2LL/A* its is the 15" 2015 Retinal macbook pro with the discrete graphics (which in the 2015 is a AMD Radeon R9 M370X) 16gb of ram, and the 2.8ghz processor so that is the highest ram, CPU and best graphics of all the 2015 models
it should have had a 1tb SSD that was pulled prior to my puchase so i put a 2tb m.2 SSD inside and used a sintech adapter that takes a standard m.2 drive and makes it fit in the slot of the 2013 to 2015 macbook pros
I'm also interested to know more about your use of "discreet" when referring to the GPU. What does "discreet" describe about the GPU?
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Discrete graphics it Is what the computing industry means if you have a GPU in addition to the one built into the motherboard. So an AMD Radeon card or a Nvidia GeForce card versus Intel integrated graphics which is built in.
saying discrete graphics isnt naming a specific model or brand it just denotes having something other then the Integrated graphics.
the macbooks with discrete graphics also have the Integrated graphics which they use when discrete graphics is not needed to save power/increase battery life. so you get the best of both worlds but discrete graphics models cost more.
eg. MJLU2LL/A* is a 15" Mid-2015 Apple MacBook Pro with a "Core i7" 2.8GHZ processor (4980HQ) with 1TB Flash and 16GB RAM which originally retailed for US$2699 with 512gb of storage or US$3199 for the 1tb model
vs
according to everymac there was a integrated graphics only version of same machine (would have had a different model identifier that isn't listed on everymac) but it aparently originally retailed for US$2299
I tend to max out my machines especially when they have no upgradeable parts which is why i limped along with my dying 2012 model till i found the specific 2015 i wanted at a price i could justify.
another wrinkle is eGPUs since all these machines have thunderbolt the could use a eGPU which i explained in the original post but can clarify if needed,but the take away is:
if you work at a desk with the laptop most of the time and dont mind not having alot of graphics power on the go you could have a eGPU box plugged in via thunderbolt may be a option to consider so you can choose a cheaper Integrated graphics model rather then the more expensive discrete graphics ones
hopes this clarifys things more then muddying the waters