Hardware Limit: The software used for these searches (like BitCrack or VanitySearch) is heavily optimized for CUDA. It is already pushing your GPU's CUDA cores to their physical limits to calculate the secp256k1 elliptic curve math and hashes. Because you are hitting a hardware bottleneck, there are no magic parameters, different tools, or software settings that will significantly increase your speed.
Here is a highly technical, math-backed explanation you can copy and paste to him. It breaks down the exact hardware limitations using his CUDA cores:"To understand why ~1027 MK/s is your absolute physical limit, we have to look at the raw hardware math.A standard desktop RTX 3060 is built with 3,584 CUDA cores. Assuming your GPU is boosting to a normal sustained clock speed of around 1.85 GHz (1850 MHz), we can calculate its maximum theoretical throughput.Cryptographic puzzle hunting (VanitySearch/BitCrack) relies heavily on 32-bit integer (INT32) operations. The total computational power your GPU can output is:
3584 cores x 1.85 x10^9 cycles/second approx 6.63 x 10^12 INT32 operations/second
four GPU is at full load.