TechPowerUp speculates the chip may lack TVB altogether. The site believes the 10850K may be an OEM variant with lower cooling requirements than the 10900K.
It wouldn't surprise us if the processor lacked TVB altogether. It's likely that the i9-10850K is an OEM-exclusive targeted at pre-built designers that don't want to deal with the steep cooling requirements of the i9-10900K to give end-users visible boosting to its TVB Max frequencies of 5.30 GHz. The i9-10850K offers nearly identical Geekbench performance to the i9-10900K.
i9-10850K
— APISAK (@TUM_APISAK) July 3, 2020
1 Processor, 10 Cores, 20 Threads
GenuineIntel Family 6 Model 165 Stepping 5
Base Frequency3.60 GHz
Maximum Frequency5.17 GHzhttps://t.co/Qv5TzYdcxGhttps://t.co/CRaDXBLO7R