I also considered 840 Pro, because I assumed that "Pro" means that it has capacitors, but no, it has not. Absolute performance is misleading alone. It must be considered together with reliability and consistency of performance. These three often represents trade-offs. It is easy to create a drive which is very good in random IO: use a large write cache on the drive without capacitors, and lie to the OS about sync. Manufacturers have done this previously, maybe they do this today, they do not talk about the internals of the drives, I do not trust them. I ended up with Intel DC S3500, contrary to the fact that I am not a fan of Intel. It is a server drive, so I hope it does not lie to the OS, and the price is not much higher, if at all. It is not optimized for the "desktop", but it has a consistent performance. I haven't even checked absolute performance, but I am sure it will be fast enough for me (because a hard disk was also enough).