Would this really be fast enough to do away with cache completely? A 100x speedup from main memory to L1 cache sounds pretty low, although I don't have any figu

Would this really be fast enough to do away with cache completely? A 100x speedup from main memory to L1 cache sounds pretty low, although I don't have any figures to back that up. If this is slower than L1 will there not be a major performance drop to the point we'd have to use at least some cache still?