No one is saying 660p is worse in every single situation than an HDD but there are instances where it does go to 100MB/s writes on simple file transfers which aren't anything abnormal nowadays when a BD movie is 50-100GB, games too and VMs easily as well.
I couldn't find any decent reviews of 660p that would include all the details in it, you have to literally hunt through multiple to get the whole picture and scout reviews of other drives.
Thanks Sean I knew I saw it somewhere, it's in a different review. Too bad it's not updated back to the 660p review.
Sure it has the nice caching that saves it from poor performance but once that cache is gone it starts to crawl.
For minimum budget, sure get a 660p 1TB, no other SSD no other HDD, done. For anything else there are better drives.
Who knows how these early QLC will last, first TLC weren't great either.
The write latencies of empty vs full are on Anandtech, watch and cry
You like the 660p, buy it, it's your money. I'm not telling anyone to buy anything, go check it yourself and make up your own mind.
I don't have the space or time to do 100GB transfers on HDDs, that's why I got more SSD storage. When ever I need to read/write HDD it can vary from 60 to 160+ MB/s depending on file age and size, doesn't go over 200 but can peak to 180-190 MB/s. And these are cheap HDDs 7200, 5900rpm with similar performance despite rotational speed difference. There are way better HDDs than this if one needs them.
25 GB onto 2 HDDs that have <100 GB left before transfer:
Now you can look again above or search the web for how great Intel 660p when near full with write speeds of large files, ~100 MB/s. Yes less than cheap old HDDs. And an SSD with over 50% empty on it (150 GB, deleted 100 GB I already transferred before to my new SSD) freshly trimmed...doing what? Yeah "same as" or rather even lower write speed than the HDDs. Cheap SSDs are great at short bursts and latencies but long writes they do not like. The Samsung 840 EVO is abysmal for an SSD, still it was the best value one could buy a few years back. The Intel 660p is not a lone struggler for large file writes, but among M.2 NVMe drives... it's the very bottom along with P1 and other QLC that may exist.
136 MB/s 5900 rpm HDD
140 MB/s 7200 rpm HDD
130 MB/s TLC SATA SSD
Any potato SSD is good enough for OS drive and loading games. But once you start transferring large files or project folders with many small files you're gonna wish you had a better faster drive.
These crazy speeds specs on SSDs are very misleading (pure marketing, burst high speed for a short period and then crawl) and you really gotta look at real world transfers of large capacities of: single file and large amount of small files to see what the drive will actually be capable of.