Lenovo 4Y37A78836 · RAID 940-8e

MPN / P/N

4Y37A78836

Manufacturer model

RAID 940-8e

Adapter type

RAID controller

Internal or External ports

External

Feature code

BQ0Y,BNWJ

Form factor

PCIe low profile

Controller chip

Broadcom SAS3908

Vendor equivalent

MegaRAID 9580-8e

Host interface

PCIe 4.0 x8

Port interface

12 Gb SAS

Number of ports

8

Port connectors

2x Mini-SAS HD SFF8644

Drive interface

SAS,SATA

Drive type

HDD, SED, SSD

Hot-swap drives

Yes

Max physical drives

240

RAID levels

0, 1, 10, 5, 50, 6, 60

JBOD mode

Yes

Cache

4GB (Standard)

Cache protection with Flash and Supercap

Yes

Performance Accelerator (FastPath)

Yes

SSD Caching (CacheCade Pro 2.0)

No

SED support (see Note 2)

Yes (Safestore)

Remote management - Controller FW update (XCC/BMC) (see Note 5)

Yes

Remote management - Inventory (XCC/BMC) (see Note 5)

Yes

Remote management - RAID setup (XCC/BMC) (see Note 5)

Yes

Documented selection limits

Use only the approved ThinkSystem server, slot/riser, backplane and correct cable/firmware configuration. Port count, direct physical-drive limit and expander-qualified drive limit are separate source fields. HBA passthrough is not hardware RAID. Flash/supercap support does not imply an optional module is supplied; consult the exact option guide. NVMe U.3 Tri-Mode x1 and NVMe-only U.2 x4 configurations are different and not simultaneous universal support; feature codes/CH5Z enablement and host cabling must be verified for RAID 940. Planned U.2 support stays planned, not a delivered feature. SED support on HBAs is host-software pass-through, not a bundled encryption/key-management service. Remote management exclusions and blade drive-count limits in sourceQualifications apply.

Manufacturer qualifications — required for selection

Note 1: RAID 730-8i 1GB is available world-wide except USA and Canada Note 2: SAS HBAs support SEDs by host software passing SED commands through the HBA to the drives. Note 3: SN550 blade 4i adapters are limited to two drives and RAID 0/1; SN850 has four drives and applicable RAID modes depend on the exact adapter. Note 5: SR635/SR655/SR645/SR665 with second-generation AMD EPYC (Rome) processors do not support remote management.

Specification source: Lenovo ↗
Checked against documentation: 19.10.2026