I've tested the new NVMe I was curious about and it looks to be a steal in the areas I was interested in(80% large reads).
SATA 500GB Crucial MX500, very pleased with those, cost ~€85-100 a piece when I bought them.
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Cheap-ass €89 1TB WD Blue SN550 NVMe.
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Just a very basic test, let's see how it holds up. (both disks were empty and newly formatted when tested)
edit: I should add, this looked like a great NVMe SSD if you know what you want to use it for(a bargain!), you should spec it up and read charts/reviews before buying it and understand those charts. It's DRAM-less, which is no-no, but the controller and SLC cache masks that and transferring a SATA MX500 to the SN550 was limited by the SATA transfer rate. At it's worst is outperforms anything on SATA with DRAM from what I've seen while being sold at sub-sata prices(for premium drives). If you know what you intend to do and what you need in regards to writes and reads in different chunks then this actually looks stellar for the price. No real benefit for games though, SATA is good enough for them right now, the do so much pre-processing and setting things up during the a loading sequence, so if you have the NVMe hole unused maybe wait a while until they have some really good stuff there. SATA is still perfectly fine.