512GB Class Performance Testing
The P1 isn't a DRAMless design, so it's already a step above some products. The new QLC SSDs don't fall in a clear-cut category at this time. The entry-level NVMe space includes products like the Toshiba RC100 and other DRAMless SSDs like the HP EX900. The 500GB P1's low endurance keeps it from the upper class like the Adata SX8200, which just happens to sell for the same price at the time of writing.
The P1's closest competitor comes from drives like the Corsair MP300 and MyDigitalSSD SBX using the Phison E8 controller running on a PCIe 3.0 x2 bus.
Sequential Read Performance
The 500GB P1 meets and even exceeds its 1,900 MB/s rating in sequential reads but it's still not enough to challenge the drives using 8-channel controllers and 3-bit per cell media currently selling at similar price points.
Sequential Write Performance
Nearly every drive in the chart surpasses the 500GB P1 in sequential write performance. This is one of the weakest points for the new P1 SSD and one that Crucial can't fix with a simple firmware update.
Sustained Sequential Write Performance
Writing large amounts of data to the 500GB P1 can be painless unless you surpass the SLC cache. Crucial uses a dynamic cache that starts with around 20% of the user volume. As you add data, the cache shrinks. We never recommend using the full userspace on any SSD to store data, but with QLC SSDs the performance tax has a harsher penalty. We call the low performance area outside of the cache native performance for the particular media used. In this case, the QLC native performance is very lower.
Random Read Performance
Reading and writing sequential data is only a very small portion of most user's daily workload. Most users read random small block size data mostly with small bursts of sequential data mixed in. The Crucial P1 was designed for "most users" and thus has strong random read performance. The new 1Tb QLC die uses a slight higher bus speed compared to 64L TLC. The increases shows in our QD1 random read test where the P1 manages to outperform all of our 512GB class favorites shipping today.
Random Write Performance
The slightly faster bus speed also propels the 500GB P1 above the others in the random write test. The new MyDigitalSSD BPX Pro delivers higher QD1 performance, but by QD2 the P1 takes off and leaves the other drives behind.
70% Read Sequential Performance
The two low sequential results ensure the 500GB P1 will have a difficult time with sequential mixed workloads. This is where you read and write data at the same time. Compared to other NVMe SSDs the P1 trails, but the new QLC drive still delivers superior performance to any SATA SSD shipping today.
70% Read Random Performance
In workload that matter, the 500GB P1 delivers acceptable random mix workload results. As we increase the workload to workstation levels, the P1 levels off.
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