There is actually a binary blob for processors that the BIOS is responsible for loading. The biggest difference is that you aren't responsible for downloading i

There is actually a binary blob for processors that the BIOS is responsible for loading. The biggest difference is that you aren't responsible for downloading it as it is usually included with your motherboard (as the grandparent says). You can find CPU binary blobs in the open source Core Boot BIOS much like you can find the GPU binary blobs in the Linux kernel.