I use very large virtual images - up to 250 GB in size - and I was shocked with the inability of the P1 to either copy those images to another drive effectively or have one copied to it. I was quite frustrated with its performance. I had similar experiences with the P1 when I first bought it. I certainly suggest watching the linked LTT video in my guide thread to see why the 660p acts the way it does. Although I should say this is not the whole story as even drives with the same hardware may act differently - a larger SLC cache means a bigger buffer of fast speed, but usually slower speeds thereafter since it has to move & convert from SLC in the background, for example. I have basic resources and guides available here if you want to learn more - the list variant of my guide has a glossary for terms while the spreadsheet lets you compare hardware directly. ![]() Although I would stick to the E12 drives over the SM2262EN ones if you are worried about consistency (the latter rely heavily on a large dynamic SLC cache). Although there are plenty of drives that will do well there - anything in my Prosumer/Prosumer & Consumer categories. from another NVMe) then a drive like the WD Black SN750 is a good choice as it doesn't rely on SLC (only a small static case, and it has an in-line controller design which means the NAND packages are equidistant from the controller for maximum sustained writes). If you're doing a lot of sustained writes at higher speeds (e.g. Therefore, the type of drive you should seek depends on your needs/workloads. All of this juggling by the controller can impact latencies and sequential performance. Dynamic SLC cache in particular has to shrink as the drive is utilized for this reason, as on the 660p (which also has a static SLC portion), which means conversion from SLC to TLC/QLC. It's temporary as it acts as a write cache - data is later moved to the native part of the drive - and further takes up more capacity (3x with TLC, 4x with QLC). ![]() SLC caching as described on these drives is not real SLC, it's just the native NAND running in pseudo-SLC (single-bit) mode. TLC (triple-level) is 3-bit, 8-voltage state vs. TLC by far and large will always offer superior performance to QLC. There are only a few exceptions, like the 970 Pro (which I would ignore for the TLC-based 970 EVO Plus) and SM961 (OEM 960 Pro that has been on sale a lot lately, I have a thread here if you're curious). You won't find SLC or MLC drives in the consumer space anymore.
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