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Model: CRUCIAL P3 PLUS 4000GB 3D NAND NVME PCIE M.2 SSD
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I bought a Crucial P3 4TB. After about 18-19% full, write speed for large files drops to about 70MB/s. You could say that's normal QLC performance, but the read speed drops at the same time. There is some serious problem with this drive design.
I have done extensive testing on this, and got a confirmation from Crucial that my drive is behaving as designed. I passed my return window, and now I'm stuck with this drive that's slower than my mechanical drives.
Almost all the crystal diskmark results you can find of this drive on amazon or even some tech review media, they only tested the default 1GB sequential. Fill this drive above 20% capacity, then run 8GB test and see for yourself.
I have access to Crucial P3 Plus at work, and I did the same tests, and got similar results.
Better off paying a little extra for the Lexar NM790, WD SN850X, or NEXSTORAGE drives.
They have DRAM + TLC (Lexar uses a special HBM system) and have Gen 4 speeds.
Seems that "Unfortunately, our CT4000P3PSSD8 SSD doesn't have the DRAM cache." per a question asked. Good price if you need it now, but a samsung 990 pro was just $20 more recently. Maybe same pricing for similar during BF?
Our community has rated this post as helpful. If you agree, why not thank Mordred
I bought one of these a couple weeks ago. Did some R/W tests on the empty drive and performance seemed perfectly acceptable - 2500-3000MB/S in both read and write. Filled it up about 70%. Then I heard that performance took a nosedive after actually adding data to it. Rerun CrystalDiskMark tests at both 1GB and 8GB.
Sequential 1MB R/Ws with only a single queue (compared to 8 which seemed mostly unchanged) dropped to 250 read, 500 write... 5-10x decrease, but only one of them would decrease at a time. I.e. first time, read is 250, write is 3000... rerun same test read is 2500, write is 500. Run it again, and it's back the other way. Something is definitely weird with this drive. Ran a bunch of tests on my Samsung NVMEs and empty or filled they perform exactly the same as they always have.
I'm gonna send it back and get a 990 PRO and just stop worrying about it completely.
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I have done extensive testing on this, and got a confirmation from Crucial that my drive is behaving as designed. I passed my return window, and now I'm stuck with this drive that's slower than my mechanical drives.
Almost all the crystal diskmark results you can find of this drive on amazon or even some tech review media, they only tested the default 1GB sequential. Fill this drive above 20% capacity, then run 8GB test and see for yourself.
I have access to Crucial P3 Plus at work, and I did the same tests, and got similar results.
Added my test results
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Kind of slow for gen 4
All my nvme lanes are full anyway but I can always throw it in an enclosure with those slow speeds you don't need a heat sink/fan.
This might not happen but I wouldn't wait too long to buy if you need something soon.
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They have DRAM + TLC (Lexar uses a special HBM system) and have Gen 4 speeds.
Our community has rated this post as helpful. If you agree, why not thank Mordred
Sequential 1MB R/Ws with only a single queue (compared to 8 which seemed mostly unchanged) dropped to 250 read, 500 write... 5-10x decrease, but only one of them would decrease at a time. I.e. first time, read is 250, write is 3000... rerun same test read is 2500, write is 500. Run it again, and it's back the other way. Something is definitely weird with this drive. Ran a bunch of tests on my Samsung NVMEs and empty or filled they perform exactly the same as they always have.
I'm gonna send it back and get a 990 PRO and just stop worrying about it completely.
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