The reason the TLB is so fast is also that it is fairly small and thus misses fairly often. Moving the TLB so it sits before the DRAM means that you can have a

The reason the TLB is so fast is also that it is fairly small and thus misses fairly often. Moving the TLB so it sits before the DRAM means that you can have a 3-4 cycle TLB with thousands of entries.