This is 512GB unified memory, not a 512GB SSD. Four identical machines available. You are buying one. I assign a serial at payment.

Specs: 

- Apple M3 Ultra, 32-core CPU, 80-core GPU 

- 512GB unified memory 

- 1TB SSD - Model A3389 

- Original box and power cable 

Includes with every unit: 

- Original Mac Studio power cable 

- Cables to hook up a JetKVM 

- Bonus Thunderbolt 5 cable (M3 Ultra is TB5)

One JetKVM + HDMI dummy/EDID dongle ships with the first unit sold unless you ask for them on yours. 

Lightly used, fully working. I erase the machine and turn Find My off before it ships. Ships UPS/FedEx from Dallas, signature required, insured. Local pickup in Dallas is fine. No returns except as required by eBay.