PSB is an optional AMD feature originally designed to protect enterprise systems, such as Epyc-based servers, from malicious firmware or boot-level malware. It works by checking that the CPU only runs BIOS firmware matching a specific cryptographic signature key, and that key is burned into the chip through one-time programmable fuses, permanently binding it to an OEM's firmware code-signing key.

Intel offers a comparable feature called Boot Guard, but with a telling difference: its hardware root of trust sits in fuses on the motherboard chipset rather than in the CPU, so Intel processors remain interchangeable across boards. With AMD's approach, a fused CPU is effectively useless for resale or reuse, and the source notes it is unclear whether Dell's implementation goes further still, since PSB can in some cases permanently fuse a newly detected CPU to a replacement board as well.

The practical knock-on effects reach beyond one buyer. Harvested CPUs from Alienware machines could flood the second-hand market with chips that quietly fail in other systems, and any transplant would require a compatible Dell motherboard, creating avoidable e-waste. The source argues the lock would be more defensible in a professional workstation and that the real problem is the lack of clear labelling, since buyers accept non-upgradable designs like Apple's when they know about them in advance.