Crucial P3 SSD review: Top PCIe 3 speed, insanely low price

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At a glanceExpert’s Rating
ProsExcellent everyday PCIe 3 performanceFantastically low price per GBConsVery low TBW ratingNon-cached QLC writes are extremely slowOur Verdict


p class=”verdict”>If you’re looking for lots of capacity without robbing a mint, then the Crucial’s P3 fills the bill. The PCIe 3 performance is very good if you don’t continually write large amounts of data, though the TBW rating is parsimonious at best.

If you’re looking for the most SSD capacity for the least amount of money, you’re talking Crucial’s P3. It’s a decent PCIe 3 NVMe performer, which means it’s very fast in the overall storage pantheon, but its chief charm is 4TB for $350. Yup, less than 10 cents a gigabyte.

This review is part of our ongoing roundup of the best SSDs. Go there for information on competing products and how we tested them.

Design, features, and price

There’s nothing unusual about the P3’s design. It’s PCIe 3.0 x4, uses HMB (Host Memory Buffer, aka your system’s RAM) for primary caching, and sports a Phison E21T controller and 176-layer Micron QLC (Quad-Level Cell/4-bit) NAND—almost identical to its Crucial P3 Plus cousin with the exception of PCIe 4 support.

The P3 is also available in $50/500GB, $90/1TB, and $175/2TB flavors–fantastically low prices for today’s market. That said, you’re only saving $10 to $15 over the aforementioned PCIe 4 enabled P3 Plus in those capacities. Where it begins to make a difference is at the 4TB level, where you save $50.

And, while the plain P3 isn’t as fast in synthetic benchmarks, it delivers just about the same real world performance as the Plus. Subjectively, you’d likely never notice the difference between the two.

Crucial’s super affordable P3 PCIe 3 NVMe SSD.

The small fly in the P3 ointment, however, is Crucial limiting the drive’s five-year warranty with some extremely low TBW ratings: 110TBW on the 500GB, 220TBW for the 1TB, 440TBW for the 2TB, and 800TBW for the 4TB flavor. Those are less than half what you’ll get with most bargain drives.

Of course, given everything we know about SSD longevity, it’s extremely likely that the P3 will will last far beyond the TBW ratings. Crucial just doesn’t guarantee it.


The Crucial P3 is a very good moderate-use performer given that it uses the older PCIe 3 interface. In fact, the drive is as fast in benchmarks as many past champions from the pre-4th gen era. Alas, the P3 is the only PCIe 3 SSD we’ve tested on our new test bed, so we can only compare it in print to PCIe 4 types.

However, I can that that the PC’s CrystalDiskMark 8 results are well above average for SSDs tested on our old PCIe 3 test bed.

The P3’s throughput lagged in these tests, which are indicative of programs that do their I/O. However, under most operating systems you won’t see nearly this much of a gap.

Yes, the Crucial P3 got its toukus spanked in CrystalDiskMark 8 by the fantastic SK Hynix P41. That’s to be expected given that its rival runs PCIe 4 and has DRAM primary cache. If you want the best random performance (shown below), which makes a difference when you’re running your operating system off of it, get an SSD with DRAM onboard.

Where the P3’s (and P3 Plus’s) lack of DRAM will show is in random operations–the ops that your OS performs a lot of.

Below is the throughput for all the CrystalDiskMark 8 tests totaled together. Not an incredibly scientific metric, but certainly indicative of overall performance.

As you can see above, overall, the P3 is not fast for an NVMe drive. However, that’s like saying the entry-level Tesla S is slower than the three-motor Plaid variant. It’s still very fast in the overall scheme of things. Where you can see the differences start to disappear is in real world sustained sequential transfers, like our 48GB small and large file tests shown below.

The P3 did more than okay in our 48GB transfers. You’d be hard-pressed to distinguish from other NVMe SSDs under there conditions. Shorter bars are better.

In what might appear to be a shocking development, the P3 actually set a new single-drive record for our 450GB single file write. However, this test is designed largely to see when a drive runs out of cache. And the 4TB P3 tested here is not going to run out for a while.

The other drives we’ve tested have been “only” 2TB in capacity. They still had plenty of cache, but likely had to do more thinking about when to write the TLC as SLC, where the 4TB P3 knew it had plenty more QLC. However…

The 4TB Crucial P3 turned in the best 450GB write time of any single drive we’ve tested. Double the other drive’s capacity helped a lot. Shorter bars are better.

…if you exhaust said secondary cache, as we did on the third 450GB write without a break, you will see a drop in write speed to less than 100MBps. QLC can be very, very slow when written natively (as 4-bit, 16 voltage level) due to all the error-checking involved. This is not a drive you want to pound on continuously, and not suitable for heavy-duty video use.

This is the speed you’ll see if you write too much data continuously to the P3. It does take a lot of data to accomplish this drop though.

Internal drive tests currently utilize Windows 11 64-bit running on an MSI MEG X570/AMD Ryzen 3700X combo with four 16GB Kingston 2666MHz DDR4 modules, a Zotac (Nvidia) GT 710 1GB x2 PCIe graphics card, and an Asmedia ASM3242 USB 3.2×2 card. Copy tests utilize an ImDisk RAM disk using 58GB of the 64GB total memory.

Each test is performed on a newly formatted and TRIM’d drive so the results are optimal. Over time, as a drive fills up, performance will decrease due to less NAND for caching and other factors. The performance numbers shown apply only to the drive of the capacity tested. SSD performance can vary by capacity due to more or fewer chips to shotgun reads/writes across and the amount of NAND available for secondary caching.

Fantastic price per GB

If capacity is your major criteria, the Crucial P3 delivers it cheaper than anything other NVMe SSD we know of. And the performance is still very, very NVMe-like until you write a whole lot of data to it at once. We do, however, wish that the TBW ratings didn’t invoke a feeling of rolling the dice on our investment.

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