Mixed Random Performance

Our test of mixed random reads and writes covers mixes varying from pure reads to pure writes at 10% increments. Each mix is tested for up to 1 minute or 32GB of data transferred. The test is conducted with a queue depth of 4, and is limited to a 64GB span of the drive. In between each mix, the drive is given idle time of up to one minute so that the overall duty cycle is 50%.

Mixed 4kB Random Read/Write

The Intel Optane 905P holds on to a very comfortable performance lead on our mixed random IO test, but the SK hynix Gold P31 raises the bar for TLC-based SSDs by about 10%.

Sustained 4kB Mixed Random Read/Write (Power Efficiency)
Power Efficiency in MB/s/W Average Power in W

The Gold P31 has the lowest average power consumption on this test out of all the drives in this batch, which naturally leads to a massive lead in power efficiency: it delivers twice the performance per Watt of the next best drive.

Compared to other high-end TLC-based SSDs, the Gold P31 performs best during the more read-heavy phases of this test. Several competitors catch up to it and a few surpass it during the most write-intensive portions of the test, but that also tends to be where the P31's power usage advantage is widest.

Mixed Sequential Performance

Our test of mixed sequential reads and writes differs from the mixed random I/O test by performing 128kB sequential accesses rather than 4kB accesses at random locations, and the sequential test is conducted at queue depth 1. The range of mixes tested is the same, and the timing and limits on data transfers are also the same as above.

Mixed 128kB Sequential Read/Write

The mixed sequential read/write performance of the SK hynix Gold P31 is unimpressive. For once, its performance is about what we'd expect from a drive designed more for efficiency than raw performance. However, it still has an 18% lead over the slowest 8-channel drive in this batch.

Sustained 128kB Mixed Sequential Read/Write (Power Efficiency)
Power Efficiency in MB/s/W Average Power in W

The Gold P31 still completes this test with remarkably low power consumption (averaging less than 2W), but the relatively modest performance means its efficiency score is only about 33% above the next best drive in this bunch.

After starting out with a good sequential read speed, the SK hynix Gold P31's performance drops steeply when writes are added to the mix. It bottoms out just below 1GB/s with a 60% reads mix, and then gradually recovers performance to finish with a fairly typical sequential write speed. Power consumption from the P31 doesn't vary much across the test, and it's only above 2W at the very beginning of the test.

Sequential Performance Power Management
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  • TheinsanegamerN - Thursday, August 27, 2020 - link

    Looks like a fantastic laptop drive.

    Now, if only we could get some nice 4800/4850U laptops to go with it.
    Reply
  • Walkeer - Friday, August 28, 2020 - link

    there is one: schenker via 15 pro / tuxedo: https://www.tuxedocomputers.com/en/Linux-Hardware/... Reply
  • TheinsanegamerN - Monday, August 31, 2020 - link

    that's a 4800h, not a 4800u. The 4800U has 8 GPU slices, the 4850U has 9. The 4800h has the same GPu performance as a 4700u, as both have 7 slices.

    It's confusing. The analog for H series would be a 4900h. I saw that laptop earlier and it would be perfect if it had a 4900h and lpddr4x, but alas it does not.
    Reply
  • Luminar - Thursday, August 27, 2020 - link

    There are barely any 2242 drives on the market. Wish there were more. Reply
  • vladx - Thursday, August 27, 2020 - link

    Very few motherboards including for laptops are limited to 2242 size. The only real use case would be tablets, sadly that market is in a steep decline. Reply
  • Luminar - Thursday, August 27, 2020 - link

    Many laptops use the 2242 form factor. All Thinkpads do, at least for the secondary drive slot.

    Finding a 2242 was difficult so I had to Dremel down a 2280 drive to the 2242 form factor.
    Reply
  • TheinsanegamerN - Friday, August 28, 2020 - link

    Uh huh. So you cut a 2280 drive down to size and got a nice light show? Because you cant just dremel off a flash NAND chip and expect the drive to work properly.... Reply
  • Luminar - Friday, August 28, 2020 - link

    Of course you can Dremel off a good amount of the WD SN500/520 series of drives. As AnandTech wrote in their review, the electronics are contained in the first 30mm of the PCB for all SN500 drives, whether they be 2280, 2242, or 2230. Reply
  • TheinsanegamerN - Monday, August 31, 2020 - link

    OK, fair enough theSN500syou can do that. I've never seen a M.2 drive like that befor,e they've always had chips along the entire 80mm length. Reply
  • cfbcfb - Sunday, August 30, 2020 - link

    Yeah, you have to fold it over and use some duct tape on it.

    A computer without at least one piece of duct tape is just not cutting it.
    Reply

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