AMD is reportedly working on a lineup of Siren Halo APUs that support both LPDDR6 and GDDR7 memory. According to Hardware leaker Gotou_3rd on X, these chips have dedicated GDDR7 memory to work with the built-in RDNA 5 GPU.
The new chip is believed to be a replacement for Medusa Halo, with Siren Point described as a Medusa refresh by Gotou_3rd. Previous reports from leaker Kepler_L2 indicated that Medusa Halo had been renamed to something else, stopping short of revealing the name. Siren Halo could be it. Gotou_3rd also indicated that Siren Halo could be related to AMD’s Magnus APU, expected to power next-gen Xbox Helix consoles. It is believed that both will use AMD’s AT2 RDNA 5 GPU.
For those unfamiliar, AMD’s Magnus APU is said to pack three full-size Zen 6 cores plus eight dense Zen 6c cores on the CPU side, alongside the aforementioned AT2 GPU. That said, the Xbox is rumoured to only have access to 68 compute units out of the 70 available on that GPU die.
Still, we’re too early to have concrete details on Siren Halo. For instance, there’s no word about its maximum core count and memory configurations. That said, assuming Siren Halo mirrors the memory configuration of the rumoured Magnus APU, we can expect up to 672GB/s of memory bandwidth using 28Gb/s GDDR7 chips and a 192-bit bus. As for system memory, AMD may keep the 256-bit bus used on its Gorgon Halo Ryzen AI Max+ Pro 400 series.
On the CPU side, previous reports regarding Medusa Halo pointed to a 24-core Zen 6 configuration, also supporting LPDDR6 memory. This is possible thanks to Zen 6’s denser CCDs (Core Complex Dies), which house 12 cores compared to 8 on Zen 5.
Either way, it will be interesting to see how this hybrid memory configuration (LPDDR6 + GDDR7) will work out. It will also be interesting to see if either one will be accessible to both the CPU and GPU, as is the case with current LPDDR5X devices.
