Specifications
Primary/Boot drive Form Factor
1 x 2.5 inch Drive NA
1 x 2.5 inch HDD with M.2 Optane NA
NOTE: Supports RAID 0 and 1 with M.2 and 2.5" HDD.
For optimal performance when conguring drives as a RAID volume, Dell recommends drive models that are identical.
RAID 0 (Striped, Performance) volumes benet from higher performance when drives are matched because the data is split across multiple
drives: any IO operations with block sizes larger than the stripe size will split the IO and become constrained by the slowest of the drives.
For RAID 0 IO operations where block sizes are smaller than the stripe size, whichever drive the IO operation targets will determine the
performance, which increases variability and results in inconsistent latencies. This variability is particularly pronounced for write operations
and it can be problematic for applications that are latency sensitive. One such example of this is any application that performs thousands of
random writes per second in very small block sizes.
RAID 1 (Mirrored, Data Protection) volumes benet from higher performance when drives are matched because the data is mirror across
multiple drives: all IO operations must be performed identically to both drives, thus variations in drive performance when the models are
dierent results in the IO operations completing only as fast as the slowest drive. While this does not suer the variable latency issue in
small random IO operations as with RAID 0 across heterogeneous drives, the impact is nonetheless large because the higher performing
drive becomes limited in all IO types. One of the worst examples of constrained performance here is when using unbuered IO. To ensure
writes are fully committed to non-volatile regions of the RAID volume, unbuered IO bypasses cache (for example by using the Force Unit
Access bit in the NVMe protocol) and the IO operation will not complete until all the drives in the RAID volume have completed the request
to commit the data. This kind of IO operation completely negates any advantage of a higher performing drive in the volume.
Care must be taken to match not only the drive vendor, capacity, and class, but also the specic model. Drives from the same vendor, with
the same capacity, and even within the same class, can have very dierent performance characteristics for certain types of IO operations.
Thus, matching by model ensures that the RAID volumes is comprised of an homogeneous array of drives that will deliver all the benets of
a RAID volume without incurring the additional penalties when one or more drives in the volume are lower performing.
When RAID is used for two non-identical drives (i.e. M.2 + 2.5 inch), performance will be at the speed of the slower drive in the array.
Audio
Table 5. Audio
Integrated Realtek ALC3289 High Denition Audio
High Denition Stereo support Yes
Number of channels 2
Number of Bits / Audio resolution 16, 20, and 24-bit resolution
Sampling rate (recording/playback) Support 44.1K/48K/96K/192 kHz sample rates
Signal to Noise Ratio 98 dB DAC outputs, 92 dB for ADC inputs
Analog Audio Yes
Waves MaxxAudio Pro Yes
Audio Jack Impedance
Microphone 40K ohm~60K ohm
Line-In N/A
Line-Out 100~150 ohm
Headphone 1~4 ohm
System specications 19