Every synthetic speed test I know of needs to be a test size larger than your RAM or you'll just be caching things in RAM. Don't expect hybrid drives to be much faster than standard.

Your CPU features L1, L2, and L3 cache to speed up performance, but how do they differ from each other?

So while L3 cache (which is where 3D V-Cache fits into the hierarchy) is a ton faster than any SSD that exists today, each 3D V-Cache chip only has 64MB of storage.