Total Capacity: 64GB. INSIDE YOUR MAC PRO 2013. Your Mac Pro has 4 slots and the maximum possible upgrade is 128GB (4x32GB). Module Capacity: 16GB.
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Mac Mini M4 SSD 2TB kit memory upgrade new expansion upgrade solution for mac mini M4 hard drive
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The only way to check this is by manually looking at your modules. However with a four slot machine like yours this is not an issue as you need to remove all of the existing ram to upgrade, but its worth knowing about.
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Crucial Pro DDR5 RAM Memory 16GB 24GB CL36 6000MHz Overclocking Desktop UDIMM Gaming Memory Intel
Aliexpress UK
Your Mac Pro has 4 slots and the maximum possible upgrade is 128GB (4x32GB). Total Capacity: 128GB. Ram speed is limited to 1066Mhz. INSIDE YOUR MAC PRO 2013.
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Hagibis USB4 Hard Drive Enclosure 40Gbps M.2 NVMe SSD Case for Mac mini M4/M4 Pro Compatible with
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Kit Capacity: 96GB. The 8 Core model the Ram will only run @ 1066Mhz. If however you were to upgrade and install a CPU that was capable of running 1333Mhz ram, the ram would then run at 1333Mhz, its a very useful dormant feature that you can enable in the future when upgrading your CPU.
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1TB SSD for MacBook Pro 2015, Compatible with MacBook Pro A1465 A1466/Mac Air SSD (2013-2015) A1502,
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Your Mac Pro has 4 slots and the maximum possible upgrade is 56GB (3x16GB + 1x8GB) or 64GB (4x16GB) depending on what CPU you have installed . Total Capacity: 48GB. Quad Core Model: 3.20Ghz. below is link that shows every compatible Xeon CPU, its details each CPU and its maximum supported ram size/speed.
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CORSAIR DDR4 Pc4 Ram RGB PRO DIMM Desktop Memory Support motherboard 8GB memoria ram ddr4 3200Mhz
Aliexpress UK
Your Mac Pro has 8 slots and the maximum possible upgrade is 128GB (8x16GB). Kit Capacity: 128GB. The 8 Core model the Ram will only run @ 1066Mhz. If however you were to upgrade and install a CPU that was capable of running 1333Mhz ram, the ram would then run at 1333Mhz, its a very useful dormant feature that you can enable in the future when upgrading your CPU.
eBay
SSD Upgrade 1/2TB HDD Nand Flash Memory For Macbook Mac Mini MacMini M2/M3/M4
Aliexpress UK
Your Mac Pro has 4 slots and the maximum possible upgrade is 56GB (3x16GB + 1x8GB) or 64GB (4x16GB) depending on what CPU you have installed . Total Capacity: 48GB. INSIDE YOUR MAC PRO QUAD CORE. below is link that shows every compatible Xeon CPU, its details each CPU and its maximum supported ram size/speed.
eBay
4 In 1 Memory Micro SD Card Reader Adpater For IPhone Ipad Android Mac PC Camera Type C Lighting Usb
Aliexpress UK
The only way to check this is by manually looking at your modules. However with a four slot machine like yours this is not an issue as you need to remove all of the existing ram to upgrade, but its worth knowing about.
eBay
MAC MINI M4 Memory Upgrade 1TB/2TB Capacity Expansion SSD Fast Read/Writing Compatible Storage 2TB
Aliexpress UK