This post will expose benchmarks I've ran on Windows 7 Pro running a mSata M4 SSD. Full disk encryption is accomplished with DiskCryptor 1.0.757.115 and TrueCrypt 7.1a. If you don't care about my intro, jump to the pictures!
For a few years I've seen a lot of disinformation regarding SSD software encryption on the Internet. So let's make it clear:
I found two issues in DiskCryptor: Its filter driver approach breaks Resmon disk access monitoring, and encrypted hard drives never spin down. I've reported these in 2008 and it's not yet fixed (if fixable). Also the author use lowercase "mb" "gb" while it's "MB" "GB". Nitpicking, but the guy is supposedly knowledgeable about disk drivers and cryptography...
The benchmarks were done with AS SSD Benchmark 1.7.4739 because it is file based, directly testing the underlying encryption.
Each benchmark was ran three times, with reboot between each run. For this post, I picked only the best performance in each category because the results were very consistent with a difference of at most 5%.
As we can see DiskCryptor is pretty darn close to native performance while TrueCrypt doesn't scale very well to threaded random accesses. With both results you'd get that snappy feeling typical for SSDs, but for certain applications DiskCryptor certainly has an edge.