They're old titles.
The 3.4GHz is based on a dual core Pentium D from 2006
https
/ark.intel.com/products/27520/Intel-Pentium-D-Processor-945-4M-Cache-3_40-GHz-800-MHz-FSB
The minimum of BeamNG is an i3-3210 (Dual Core + HT) @ 3.2GHz, from 2013.
https
/ark.intel.com/products/71053/Intel-Core-i3-3210-Processor-3M-Cache-3_20-GHz
Between generational improvements (approx 10-15% per gen), the desktop i3 of Skylake eras would be approx 50% "better" than the 3rd gen minimum.
You're looking at a 6th gen i7 (albeit, mobile), 4 cores/8threads, 2.6GHz base........... you're actually looking at a "faster" CPU, and clock speed isn't so relevant.