https://www.ebay.com/itm/AMD-Ryzen-7-5700G-ENGINEERING-SAMPLE-ES-/293973422567
Specifications
# of CPU Cores: 8
# of Threads: 16
# of GPU Cores: unknown
Base Clock: unknown
Max Boost Clock: Up to 4.45GHz
OC available,
Buyers' feedback: 1.425V boost to 4.7 GHz(depends on a high-end MB and your skills), 1.3V 4.6 GHz.
Package: AM4
Default TDP / TDP: not sure
Ctdp: not sure
Max Temps: 95°C
*OS Support: Windows 10 - 64-Bit Edition, RHEL x86 64-Bit, Ubuntu x86 64-Bit
*Operating System (OS) support will vary by manufacturer.
https://www.svethardware.cz/vzorek-amd-ryzen-7-5700g-se-uz-prodaval-v-bazaru-jaky-ma-vykon/54277