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Samsung 990 Pro 2 TB

So what's the best option for a new Primary drive in the 2-4TB market?
For primary, I'd go 1TB. Much better chance to score everything you need (TLC, DRAM) without breaking the bank. For storage/secondary, 4TB TLC DRAM-less. For the former, look for the best QD1 4k random reads you can find, for the latter, it doesn't really matter (go for cheap). For either PCIe 4 is plenty, unless you backup very, very often or otherwise perform frequent massive transfers.
 
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@529th depends on what you're looking for.

If you're aiming at a price/performance king, the Lexar NM790 is hard to beat.
The Kingston KC3000 and the WD SN850X are both top performers with DRAM that tend to not cost that much more.
PCIe 5.0 drives also exist but aren't worth the extra cost.

If you're looking to outfit a home server or have another reason to want a highly durable drive, the Micron 7400 PRO is occasionally on sale for prices competitive with aforementioned consumer SSDs. It's slower, but you can fill it up from empty to full without write speed ever dropping below 2GB/s. Just keep in mind that it's 22110 form factor and runs very hot, so you need good cooling.
Or you could look at m.2 to u.2 adapters and buy a new (or used) enterprise drive. These don't tend to perform best at Q1T1 sequential, though - they're built for high parallel throughput.
 
The Kingston KC3000 seems like a pretty good drive. I do have 2 WD SN850X 2TB drives in use. I'm pretty much decided on going 4TB this time and found a good deal on a Kingston KC3000 4TB... $276 Are there any Caveats between the two drives and which is the better drive, I'm thinking the Kingston KC3000 is.
 
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