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The Surface Pro 3 128 GB model has 4 GB of RAM, and its RAM, processor, and internal storage are not designed as user-upgradeable components. However, you can expand file storage by using a microSD card in the slot under the kickstand or an external USB drive.
Also, the Surface Pro 3 is not eligible for an officially supported upgrade to Windows 11.
In practical terms, storage expansion is possible, but improving the internal memory or processor would require replacing the device.
Hope my answer helps. Have a nice day