How come speeds on this only go "up to 2800mb/s" when read speeds on a single nvme drive can hit 3500mb/s?

Hello! The OWC Express 4M2 has a limit on the speeds achieved by each drive inside due to each slot in the device only being connected to a single lane of Thunderbolt 3's PCIe 4 lane architecture. This limitation maxes each drives individual performance at around 700 mb/s. When used as an striped array RAID 0, this achieves consistent speeds around 2800mb/s.

If using only of of the four available pcie lanes, will i be able to get 2800mb/s speed in the case i'm using a capable nvme ssd?

Hello! Unfortunately each slot is only going to be capable of about 700MB/s. This is due to being a 1-lane PCIe connection. You would need to utilize four drives in a RAID configuration in order to get the 2800MB/s speeds.

Given there is a “cap” on speed is there any advantage to using Samsung 970 Pro drives over standard 970s?

Hello! You would not see a significant speed advantage with the Pro drives over the standard - if any at all. I'm never against using good quality drives, but you won't get better performance than the limit of what a single PCie lane is able to produce per drive installed in the enclosure.

Can it be used as a boot drive to boot macos or windows 10?

Not on MacOS. Since MacOS 10.14 apple eliminated booting off software raided disk arrays.

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PEACE OF MIND WARRANTY - Comes with a 1-Year OWC Limited Warranty, so you can focus on your work without worry.
SLEEK PORTABLE DESIGN - Lightweight aluminum enclosure makes it easy to carry your RAID system wherever you need it.
EXPAND YOUR STORAGE HORIZONS - Support for up to 4 NVMe drives, giving you a massive 32TB of storage at your fingertips.
UNLEASH LIGHTNING FAST SPEEDS - Experience data transfer rates up to 2800MB/s, perfect for professionals on the go.
THUNDERBOLT CERTIFIED PERFORMANCE - Seamlessly compatible with both Mac and Windows, ensuring versatility in your tech ecosystem.

The OWC Express 4M2 is a cutting-edge 4-slot M.2 NVMe SSD enclosure designed for high-performance data storage. With support for up to 32TB and lightning-fast transfer speeds of 2800MB/s, this portable RAID system is perfect for professionals who demand speed and reliability. Featuring dual Thunderbolt 3 ports, it is compatible with both Mac and Windows systems, making it an essential tool for any tech-savvy individual.

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Memory Storage Capacity	32 TB
Compatible Devices	Personal Computer
Hard Disk Form Factor	3.5 Inches
Max Number of Supported Devices	4
Data Transfer Rate	2800 Megabits Per Second
Manufacturer	Other World Computing
UPC	810586037235
Model	OWCTB3EX4M2
Package Dimensions	30.6 x 19.3 x 11.2 cm; 1.59 kg
Item model number	OWCTB3EX4M2
Batteries Included	No
Batteries Required	No
Item Weight	1 kg 590 g

OWC Express 4M2 4-Slot M.2 NVMe SSD Enclosure w/ Thunderbolt3 Ports

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