825GB PCIe Gen 4 NVMe SSD External storage NVMe SSD Slot, support for USD HDD I/O throughput 5.5GB/s (raw), 8-9GB/s (compressed) Dimensions 390 x 104 x 260 mm (15.35 × 4.09 × 10.23 inches) Weight 4.5kg (9.92 pounds) If it's boring on the outside, the Xbox Series X is a beast inside. In purely technical terms, it's got a custom chip and graphics unit supplied by AMD: an 8-core AMD Zen 2 CPU clocked at 3.8GHz (3.6GHz with SMT, or simultaneous multithreading), and an AMD RDNA 2 GPU with 52 CUs (compute units) and clocked at 1.825 GHz. The latter delivers 12.15 teraflops of power, which is more than what's offered by PlayStation 5 (10.28 teraflops). But it's not quite an apples-to-apples comparison, because the PS5's GPU — also AMD RDNA 2, clocked faster (2.23GHz) but with fewer compute units (36) — is capable of variable frequency (GHz). The PS5 also has the same CPU as the Series X in the custom-made 8-core AMD Zen 2, but it's got a lower clocked speed (3.5 GHz with SMT) albeit with variable frequency capability in that department too.