Interestingly, it turns out that Asus' WRX90 "sTR5" motherboards for the Threadripper 7000 lineup feature an option to manually override or disable 3D V-Cache in said chips per Videocardz.

The Threadripper 7000 and Threadripper Pro 7000 WX processors are built for the new sTR5 socket, which will be used for two platforms supported by AMD motherboard partners. The WRX90 platform is ...

Surprisingly, Threadrippers with 3D V-Cache have been confirmed in the manual for an Asus TRX motherboard ... Not that you'd ever want to use a Threadripper chip for gaming.