AMD Ryzen Z3 Handheld Leak Points to 12 RDNA4m CUs and a 25W Design

The short version: the leak points to a smaller, purpose-built handheld chip with fewer CPU cores and a more modest GPU than today's top Z2 Extreme. Treat it as a direction of travel, not a spec sheet.

What the leak claims​

The source is a post from X user Gotou_3rd (@Gotou_kai3). VideoCardz also credits CaptainMcShotgun and lists Kepler as a source for its comparison table. The post itself is three terse lines: "same IP, semi-customized, FF6 25x25mm package. 4c+2lp (maybe changed) 12CU."

The two outlets read those lines as follows:

• Platform roots: Ryzen Z3 reportedly uses the same Zen 6 and RDNA4m building blocks as Medusa Point, AMD's rumored Zen 6 mainstream mobile platform. The configuration is said to be designed for handhelds rather than taken straight from a laptop chip.
• CPU: four Zen 6 cores plus two low-power cores. VideoCardz's table lists it as 6 cores / 12 threads.
• GPU: 12 RDNA4m compute units (CUs).
• Power targets: about 15 W for Ryzen Z3 and about 25 W for Ryzen Z3 Extreme. These are described as optimization targets, not an AMD-published configurable TDP range.
• Package: FF6, 25 × 25 mm, which both outlets say is smaller than the FP8 package used by Strix Point.

The low-power cores are reported differently​

The two outlets disagree on what the two low-power cores are:

• Wccftech says they are low-power Zen 6 cores.
• VideoCardz says in its text that they are low-power Zen 5 cores, and its table lists "4× Zen 6 + 2× Zen 5 LP."

The leaker's "2lp" doesn't say which generation they are. On top of that, the leaker added "maybe changed" to the core count. For now, the only safe statement is four Zen 6 cores plus two low-power cores of uncertain generation.

The 12-CU figure may not apply to both models​

Both outlets say it is unclear whether Z3 and Z3 Extreme get the same 12-CU GPU, or whether AMD will disable part of it on the cheaper model. VideoCardz's table lists 12 CUs for both, but its own text treats that as an open question.

Section summary: one leaker, two write-ups. The package size and 12-CU count are stated plainly. The core layout comes with a "maybe changed" caveat and a cross-outlet disagreement.

How it compares with what's shipping now​

Ryzen Z2 Extreme is the current top handheld chip, and its published specs show how different Z3 would be. As listed in hardware databases and spec guides:

• CPU: 3 Zen 5 + 5 Zen 5c cores, 8 cores / 16 threads "…combines three Zen 5 CPU cores, five smaller Zen 5c cores and a 16-core RDNA 3.5 integrated GPU in a configurable 15–35 W power envelope."
• Default power: AMD lists a 28 W default TDP, up to 5 GHz CPU boost and up to 2.9 GHz graphics boost.
• Package: FP8, the package the leak says FF6 will undercut.
• Shipping devices: MSI Claw A8 and Lenovo Legion Go 2 both use Z2 Extreme.

Rows below Z3 follow the VideoCardz comparison table.

My own reading of those numbers: on raw counts, the rumored Z3 Extreme has fewer CPU cores and fewer graphics CUs than Z2 Extreme. VideoCardz's "trade CPU cores for a larger GPU" framing compares Z3 with standard Medusa Point, not with today's handhelds. Against Medusa Point, the leak says Z3 drops four Zen 6c cores and goes from 8 CUs to 12.

Does fewer CUs mean slower? Not necessarily. A newer architecture, a newer process, memory bandwidth, and a lower 25 W target could all change the picture. But nothing in the leak measures performance, so neither a win nor a loss is established.

Section summary: compared with Medusa Point, Z3 leans toward graphics. Compared with Z2 Extreme, it is smaller on paper and may be aimed at efficiency rather than peak output.

RDNA4m and the FSR 4 question​

Anyone hoping for RDNA 5 in a PC handheld will be let down by this leak:

• VideoCardz says RDNA4m is a derivative of RDNA 3.5 that reportedly adds RDNA 4-class units for matrix math. It suggests that could allow native FSR 4 support and possibly later AMD technologies.
• Wccftech calls RDNA4m "technically an RDNA 3.5+ architecture" and says it is not really related to the RDNA 4 desktop graphics architecture.
• According to VideoCardz, only the rumored PS6 handheld is currently expected to use RDNA 5.

The cautious reading is that FSR 4 on Z3 is something the reporting expects, not something AMD has confirmed. Even when AMD's upscalers are supported on a chip, they still depend on individual games adding them. Hardware capability is only half of that.

Why a smaller package matters, and where the leak stops​

According to Wccftech, a package smaller than FP8 makes the chip easier to fit into compact handheld designs. In general terms, a smaller package gives device makers more room on the board for battery, cooling, and controls. It doesn't automatically mean a thinner device, because screens, batteries, and fans set most of a handheld's size.

VideoCardz notes that the leaker had already linked FF6 to Ryzen Z3 and handhelds. It also says Z3 looks more customized than earlier Z-series chips, which were essentially power-tuned versions of existing parts. VideoCardz adds that, so far, nothing suggests AMD will bring older chips under the Z3 name. That would be a change from Z2, which mixes Zen 2 through Zen 5 parts under one name.

The leak does not include:

• a launch date
• pricing
• partner devices
• benchmarks
• clock speeds
• memory configuration
• any measurements of battery life or heat

What Windows handheld owners should take from this​

• Current Z2 Extreme buyers: nothing here makes today's hardware obsolete. The rumored chip has no release date, and on paper its core and CU counts are lower.
• People waiting for the next generation: the trend to watch is AMD designing silicon specifically for handhelds, with lower power targets and a smaller package. The tradeoff may be fewer cores in exchange for efficiency.
• Spec-sheet watchers: expect the two low-power cores and the per-model CU counts to change before anything is official. The leaker already flagged the core count as uncertain.

If AMD's final specs match this leak, the 15 W and 25 W targets suggest it is building Ryzen Z3 for longer battery life rather than higher peak power. Until AMD confirms anything, the details above are unconfirmed.