Home › Forums › General Discussion › Upgrade RAM & OS on MacPro 5.1 2010 › Reply To: Upgrade RAM & OS on MacPro 5.1 2010 CharlesKeymaster27th April 2021 at 10:14 am#417547HI. With the X5690 you can run up to 4 x 16GB modules in your Mac pro. I have them available for £25.00 per 16GB module. [email protected] if you need any. Yes your GPU will support Mojave and even higher, up to Big Sur if you use opencore.