Lenovo's ThinkCentre X Ultra puts the Ryzen AI Max+ PRO 495 in 1.6 liters, and stops at 128GB

Lenovo's IFA press release, datelined Berlin, September 3, 2026, introduces the ThinkCentre X Ultra: a "compact 1.6L form factor" desktop with "Up to AMD Ryzen™ AI Max+ PRO 495 Series processors and supporting up to 128GB of unified memory", "available starting November 2026, with an expected starting price of 3100€". No US price is given.

The interesting number is the one that is lower than the chip allows.

What the 495 is

AMD's product page for the Ryzen AI Max+ PRO 495 is the primary spec sheet, and it is unusually complete:

| | Ryzen AI Max+ PRO 495 | |---|---| | CPU | 16 cores / 32 threads, up to 5.2 GHz boost, 3.1 GHz base | | Cache | 16 MB L2, 64 MB L3 | | TDP | 55W default, 45-120W configurable | | Process | TSMC 4nm FinFET (CPU dies and I/O die), 3 dies per package | | Memory | 256-bit LPDDR5x, max 192 GB, LPDDR5x-8533 | | Graphics | Radeon 8065S, 40 compute units, 3000 MHz | | NPU | Up to 55 TOPS | | I/O | PCIe 4.0, 16 lanes; 2x USB4 (40Gbps) | | OS listed | Windows 11, RHEL x86 64-bit, Ubuntu x86 64-bit |

The 192GB ceiling is the headline AMD attached to this family in its May 20 launch post: the next developer platform would feature "higher clock speeds, up to 192GB of unified memory and 160GB of VRAM", and "Ryzen AI Max PRO 400 Series are the world's first x86 client processors capable of running 300 billion parameter models locally", a claim that carries a footnote. The post describes the parts as "Zen 5" cores with "AMD RDNA™ 3.5 graphics" and an "AMD XDNA™ 2 NPU".

What Lenovo built

The X Ultra ships with up to 128GB. Lenovo does not say why in the release, and the release is where the verifiable claims stop, so this piece will not guess. What the release does specify is the rest of the box: "Up to 55 TOPS NPU", "2× Thunderbolt™ 4", "1× Ethernet (10GbE RJ-45)", "Up to 2× 4TB M.2 2280 Gen5 Performance SSD", and operating systems "Windows 11 (Pro & Home)" and "Linux AMD AI OS". The machine is "integrated with AMD Ryzen AI Developer Center, giving users access to preconfigured AI tools, models, and workflows".

Then the line that makes 128GB less of a ceiling: a "cluster-ready architecture connects up to four systems in a unified platform". The release names no interconnect for the cluster. The port list gives two candidates, 10GbE and Thunderbolt 4, and says nothing about which one carries the traffic or what software does the splitting. Four units at 128GB is 512GB of memory in 6.4 liters, but memory across a network link is not the same resource as memory on one 256-bit bus. Hold the 300-billion-parameter language to the single-box configuration until Lenovo publishes the cluster stack.

The comparison the price invites

At a starting price of 3100 euros, the X Ultra lands in the same conversation as the other 128GB Ryzen AI Max boxes, with two differences that matter to a Linux buyer: a vendor-listed Linux image at launch, and 10GbE on the board rather than on a dongle. What it does not have is the 192GB the silicon advertises. The AMD spec sheet says the part can do it. The first Lenovo desktop built on it does not.

Primary sources: Lenovo press release, September 3, 2026, AMD Ryzen AI Max+ PRO 495 product page, AMD blog, May 20, 2026, read 2026-09-11.