Quickly generate Ethereum vanity addresses

My requirement: quickly generate an Ethereum vanity address, for example: mantissa 8888888, and generate it successfully within 3 minutes. For example: mantissa ABCDabc, success within 3 minutes. The master of the Ethereum forum said that only by using the GPU to generate more than 100 MHz/s. Must be familiar with cryptocurrency private key, public key. I can provide test code