Retailer Amazon.com Inc. this month told pre-order customers that Microsoft Corp.’s Xbox Series X may not ship at launch due to high demand.

The retailer cautioned to customers in an email that they may not receive the Xbox Series X on the day of release due to high demand. It added that it is making an effort to secure additional inventory.

The Xbox Series X sold out at Amazon’s Video Games division within 10 minutes on Sept. 22.

The Xbox Series X will include an 8-core 3.8Ghz Custom Zen 2 CPU, 12TFLOPS 1.825 Ghz Custom RDNA 2 GPU by AMD, 16GB GDDR6 RAM, 1TB Custom NVME SSD, USB 3.2 External HDD Support, and a 4K UHD Blu-ray disc drive at $499.99.

Graphics fidelity includes 4K at 60FPS, up to 120FPS fidelity, Variable Refresh Rate, Variable Rate Shading, 8K functionality.

The Xbox Series S will include an 8-Core AMD Zen 2 CPU at 3.6Ghz and 3.4Ghz w/ SMT Enabled, AMD RDNA 2 GPU with 20 Compute Units at 1.565Ghz and 4TFLOPS of GPU power, 10GB GDDR6 RAM, and a 512 PCIe Gen 4 NVME SSD at $299.99.

Graphics fidelity includes 1440p at up 120FPS, DirectX ray tracing, Variable Refresh Rate, Variable Rate Shading. 4K streaming media playback and 4K upscaling for games.

The Xbox Series X and Xbox Series S will be released Nov. 10.