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The RAM is soldered onto the motherboard. It is not user replaceable. Besides that, there are no GDDR5 modules for sale. They exist as FBGA packages only for OEM installation.
You can insert a brand new, unformatted drive and it will format the drive just fine. You will need to get the *FULL* firmware (~900 MB) from Sony's system update webpage, not the smaller delta update which is ~320 MB in size. Once the new drive is installed, you put the flash drive on the rear port (unless you have an ultra thin one that can fit into the obnoxiously recessed front ports), turn the PS4 Pro on, and follow the on-screen instructions.
Installation takes ~20 minutes for a fresh HD. Shave a few minutes off for SSDs.
The maximum hight of the HD/SSD inside the caddy for the PS4 Pro is 9.5mm. There is no way a juicy 15mm 5 TB HD (or similarly large SSD) is going to fit inside there.
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