Suppose that in 20 years, the first general-purpose quantum processors for PC's are being sold. And naturally, wanting to see some speedups, I buy one of them and put it in my computer alongside regular hardware.

Assuming the software on my computer is designed to take advantage of quantum computing, what boosts would I notice? (Also assume that cryptographic standards have changed IE we're using NTRU instead of RSA, we're using 256-bit AES instead of 128-bit, 512-bit cryptographic hashes instead of 256-bit, etc., and we still don't know if P = NP.)