Steam Deck 2 leak points to mysterious AMD Gainsborough APU on TSMC N3P

Valve has repeatedly said that it is working on a Steam Deck successor, but has heretofore remained deliberately vague about the hardware that could power it. A new AMD leak may have finally provided the first meaningful clue. According to Moore's Law Is Dead, an unreleased AMD APU codenamed Gainsborough is a semi-custom 3 nm design that could potentially be destined for the Steam Deck 2. The chip has recently surfaced in AMD drivers and is reportedly associated with its own package, suggesting that it is not simply another mainstream Ryzen APU.

MLID claims internal AMD documentation consistently identifies Gainsborough as a semi-custom processor developed by the company's S3 team. More importantly for a handheld, it is reportedly manufactured using TSMC's efficiency-focused N3P process. The naming connection is also unusually conspicuous. The custom AMD APU inside the original Steam Deck was codenamed Aerith, after Aerith Gainsborough from Final Fantasy VII. "Gainsborough" would thus be a particularly fitting codename for its successor.Another clue comes from the conventional PC market.

MLID says he contacted multiple OEM sources familiar with upcoming AMD products such as Medusa, but none had heard of Gainsborough. That would be consistent with the processor being built for a specific customer, as is the case with the original Steam Deck SoC. The timing also lines up well with what we have previously heard about the Steam Deck 2. Valve programmer Pierre-Loup Griffais recently confirmed that the company is "hard at work" on its next handheld, while reiterating that the lessons learned from the new Steam Controller, Steam Machine and Frame headset will feed into the eventual Steam Deck successor.

Valve has also repeatedly stressed that it does not intend to release a new Deck simply because faster silicon exists. Instead, the company is waiting until it can deliver a clearly noticeable generational performance improvement without compromising the balance of efficiency, battery life and price. Previous rumours have pointed to 2028 as a possible Steam Deck 2 launch window. MLID arrives at a similar conclusion independently, suggesting that Gainsborough, if it really is Valve's chip, would most likely appear in late 2027 or sometime in 2028.

The actual specifications for Gainsborough remain unknown, as is often the case with chips scheduled to launch years later. MLID speculates that it could use somewhere between four and eight Zen 6C or similarly power-efficient CPU cores alongside 12 to 24 RDNA 5 compute units.

However, an N3P-based chip will be old-ish news by 2028, with the N2 family taking over as TSMC’s bleeding-edge node. Whether or not anyone will actually use N2 for a handheld chip remains to be seen, especially with rising wafer costs. AMD’s own Ryzen Z3 will be the go-to platform for many, while others might look at whatever Intel has cooking. The Arc G3 Extreme is a competent chip, and it will be interesting to see what its successor has in store.

All of this fits neatly into another upcoming handheld chip: the next-gen PlayStation handheld. Sony's rumoured PlayStation 6 Portable is also expected to use a Zen 6 and RDNA 5-derived AMD APU. Previous leaks have pointed to six CPU cores and 16 RDNA 5 compute units, with the handheld reportedly targeting raster performance above the Xbox Series S despite relatively low GPU clock speeds. MLID now claims that Sony's Canis APU for the PS6 Portable also uses TSMC N3P,

If both leaks are accurate, Valve and Sony may be taking broadly similar approaches to their next portable gaming devices: semi-custom AMD silicon built on an efficiency-oriented 3 nm node, with performance gains coming from substantially newer CPU and GPU architectures.

None of this confirms that Gainsborough will ultimately appear inside the Steam Deck 2. MLID acknowledges that Valve could have evaluated the processor and subsequently abandoned it, while AMD could potentially repurpose the design elsewhere. Its recent appearance in AMD drivers, combined with its semi-custom status, N3P process and unusually apt codename, nevertheless makes Gainsborough one of the more intriguing Steam Deck 2 leads to emerge so far.