Hi. My 13” macbook pro, early 2015, is growing old. It’s in very good condition and I don’t want to buy a new computer. However, a processor/ram upgrade would come in handy.
Can I replace the motherboard with a better one from the same model? Would an i7 with 16gb of ram do the trick? Thank you.
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It won’t be easy to find one, they are quite rare, but yes, an i7 logic board of the 2015 model would fit in place of the i5 just fine, same form factor and connectors.
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With these Macs, the performance gap between the i5 vs i7 is minimal due to the U series CPUs. It will help as long as you get a i7/16GB replacement board, but do not expect a night and day difference with ULV chips. You may be better off with a i5/16GB board.
The real i5 vs i7 gains are seen once you step up to 8th gen U series from an i3, which aren't found in the 13" rMBP -- these use Broadwell, so they have the old 2C/4T chips. The 8th gen i5/i7 are 4C/4T (i5) or 4C.8T (i7), or 2C/2T (i3, run). The i5" version uses Intel HQ Haswell chips in 2015, but those are 35W parts and wouldn't work in the 13" due to the thermal footprint. The Broadwell chips in these are power optimized HSW.
Longer term, the machines that look like are the M series 14" in this size class with 32GB at the minimum, preferably 64GB. For those, the 14" is better unless you are okay with the bulk the 16" is going to have as it's essentially like the old 17" MBP, just a little lighter (5lbs for the 16"/6.5lbs for the Unibody 17"). The weight was reason enough to not recommend it blindly back then, and the 16" is no different - TRY BEFORE YOU BUY! When I got time with the new 16" I felt right at home like I got my 17" A1297 back after 10 years, but I knew what to expect for weight and bulk. It was a de-ja-vu moment; we got the screen, MagSafe, ports, keyboard, AND SD card slot back.
Though generally speaking the 16" will be similar to the 15" but if you need it for travel, it might be a touch too big and heavy. For desk use, it can go both ways. The weight catches people who had 13" machines for years off guard -- for them, 14" is better.
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Some applications do not work with newer OS and you cannot run old OS on new machines. So it would be better to keep the answer short and to the point.
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