The cores are faster/better, but the one public document I found [1] without logging in to Infineon does not specify how they are clocked. Weirdly, the document says that both Wi-Fi and Bluetooth have M3 cores, no M4 mentioned.
The chapter on Wi-Fi says this:
10.1 WLAN CPU and Memory Subsystem
The CYW43439 includes an integrated ARM Cortex-M3 processor with internal RAM and ROM.
[...]
On-chip memory for the CPU includes 512 KB SRAM and 640 KB ROM
And for Bluetooth it has this:
8. Microprocessor and Memory Unit for Bluetooth
The Bluetooth microprocessor core is based on the ARM Cortex-M3 32-bit RISC processor with embedded ICE-RT debug and JTAG
interface units. It runs software from the link control (LC) layer up to the host controller interface (HCI). The ARM core is paired with a memory unit that contains 576 KB of ROM for program storage and boot ROM, and 160 KB of RAM
for data scratch-pad and patch RAM code.
Strange and confusing.
Edit: quote markup, added mising section number for BT.
Yes, and that's why ESP32 can be so cheap. They just run the WiFi stack on the same core, and they got very good know-how on the side of hardware<->RTOS interaction how to make it viable (very hard.)
Imho, non-wireless-intergrated MCUs will go extinct in IoT very soon.
They also have the best mixed signal out of every other scrawny IoT startup who uses off-the-shelf IP.
