Triple-Level Cell TLC NAND based SSDs perform usually quite well, but when you copy a large amount of data to the drive without and idle time you’ll often find a large drop in write speed. TLC NAND is great in applications where write operations are limited , but is usually not recommended for critical systems that have heavy write operations as they have lower endurance ratings than SLC or MLC NAND and of course sustained write performance isn’t stellar. In recent years drive manufactures have been figured out that by using SLC or TLC treated as SLC as a cache they can keep the drives overall write performance high as long as the amount of data being written to the drive fits in the cache. If you overflow the cache, you are then writing directly to the TLC NAND and the write performance will drop down to that level. It should be noted that the SLC cache will clear once the drive idles, so this only impacts long writes that are many GB in size. This might not be a typical workload scenario for this ultra-value or mainstream drives, but still something worth pointing out!
Let’s take a look at the Corsair Force MP500 480GB M.2 NVMe drive to see how it handles sustained write scenarios.
We secure erased the drive before running this test and found that the performance started out at around 1350 MB/s and them improved up to over 1400 MB/s after a short time. When you average the test results over the 45 second period the average speed is 1391.78 MB/s.
Here are some 45 second average sustained write speeds on recently tested drives:
Not bad performance as the Corsair Force MP500 is without a doubt one of the fastest SSDs around with regards to sequential write performance, but we planned on seeing that due to the high-end Phison controller and use of MLC NAND Flash.
When you take a look at extended sustained write performance you can see that see a couple major performance dips down to 600 MB/s, but for the most part the sustained write performance stays well above 1,300 MB/s. Interesting to see the performance jump up twice like it did, but we aren’t going to complain about seeing solid sustained write performance.
A quick look at the drives temperatures showed that we were hitting 71C and that was with a 120mm case fan sitting directly over the MyDigitalSSD BPX 480GB M.2 NVMe drive blowing cool air over it. Before we started the sustained write test we were bouncing around 38C on the drive at idle. We set the polling rate to 30 seconds for this test and you can see how the drive heats up in this test below.
Phison has told us before that the E7 controller is rated for use at up to 125C and that the temperature sensor is located on the controller itself and not externally like some other designs. Some might think that this drive is close to overheating as MyDigitalSSD gives the operating temperature range for this series as being between 0° ~ 70°C, but that is for the room temperature and not for the device itself. Thermal throttling is triggered on the BPX series at 80C and then performance will be scaled back until the temperature is back under 80C. We never got close to that temperature threshold with a 10 minute sustained write with active cooling, so it shouldn’t throttle with appropriate cooling. We don’t advise sticking any Phison 5007-E7 controller based SSD into a laptop with limited airflow as they do run hot and use up to 7 Watts of power and that isn’t good for the drive or the laptops battery life.
Let’s take a look at some common benchmarks!