AES-NI Performance Analyzed; Limited To 32nm Core i5 CPUs

Benchmark Results: PCMark Vantage Communications Test

And here is why.

Again, Intel only accelerates AES. Data compression doesn’t benefit. Rather, it depends on core count and clock speed.

Decryption that includes AES is also significantly faster.

Here is one more synthetic metric where Intel's Clarkdale-based Core i5-661 shines thanks to AES support.