I wrote it that way because I never run my RTX 4090 at full power, given the extremely low chance of success. When I tested it at 100% load, both the GPU and memory heated up more than they do during gaming or even FurMark. In this mode, the 4090 could overheat and fail rather quickly.
However, I’m not a proponent of prefix-based searching—I’m simply interested in maximizing the search speed while maintaining a reasonable GPU load. Perhaps I don’t fully understand how programs like KeyHunt and BitCrack work, and the key search is already implemented using H160 rather than the full P2PKH address. However, the command in the batch file appears to be searching by the full address rather than its H160, which is why I had this question.
The reason why 4090 is fast is because it consumes more power. Forget about specs, you can directly compare two cards depending on how much power each one eats up - all of them in the last few gens will have more or less the same hash-rate / watt. So don't expect an RTX 4090 that's in 50% load to run faster than a card that's spec'ed at half the power draw but runs at 100% and doesn't have cooling issues.
For puzzle solvers, H160 is extracted from address, in order to account for the network byte, or/and probably left-overs from vanity search prefix-based programs. Pretty-sure they all match H160, it's useless to do base58 conversions if the H160 check fast-fails first.