Limoncello promptly replied: “My apologies; however I don’t have any extra data to share on this subject.” With that, the dialogue and Kilpatrick’s inquiry have been over.
The Lendacky remark in 2020 Kilpatrick referred to got here on this thread discussing encryption options obtainable in AMD CPUs. Lendacky mentioned that the Ryzen 3700x, a client CPU, “ought to help TSME.” In a 2025 remark in the identical thread, the engineer adopted up on his remark in regards to the 3700x.
“I like to recommend utilizing TSME (Clear SME), however it’s a BIOS choice that must be uncovered by your BIOS supplier,” Lendacky mentioned in response to the query concerning the client chip.
There’s no indication that AMD ever marketed or marketed TSME as being obtainable in client CPUs. AMD has lengthy mentioned {that a} associated reminiscence safety, Safe Reminiscence Encryption (SME), is out there solely within the Professional and Epyc CPU tiers. SME is OS-managed. It makes use of a single key and permits the OS to selectively encrypt particular person reminiscence pages. TSME is firmware-managed. It encrypts all RAM with no OS involvement. When lively, it gives safety in opposition to bodily assaults, together with chilly boot exploits, DRAM interface snooping, and reminiscence module removing. It prompts silently when enabled within the BIOS, making it the extra virtually helpful of the 2 protections.
AMD engineers’ feedback, reminiscent of these talked about above, and the years of TSME working simply nice within the lower-cost tier processors, have understandably conditioned Kilpatrick and different customers to fairly regard it as an anticipated a part of the chip package deal. AMD quietly eradicating it and offering no acknowledgment or clarification strikes these customers as one thing of a betrayal.
“They might haven’t realized they did it resulting in their cagey responses, or they might have finished it deliberately and tried to get away with it, resulting in the identical cagey responses,” Joe Fitzgerald, an skilled in silicon-level safety, mentioned in an interview, referring to AMD’s potential motivations for withdrawing TSME. “However I actually really feel like an evidence needs to be so as, even when it was ‘TSME was by no means imagined to be supported. We did ship some firmwares that erroneously enabled it, however you shouldn’t use them since we are able to’t assure it’ll work correctly.’”
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