Is this controller compatible with UEFI motherboard?

It has worked with my 2-year old or so ASUS UEFI motherboard for almost a year now, no problems except it adds around 30 seconds, give or take, to boot time. The system is up for many weeks or months at a time, with none of the down time due to the Megaraid. I'm also asking a lot of the Megaraid: it's running 4 X 500 GB SSDs configured as RAID 5, and is the system and user drive. (I also have other drives running on the PC, including another RAID drive, co-existing with the Megaraid, no problems.)

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LSI MegaRAID LSI00328 (9271-4i) PCI-Express 3.0 x8 SATA / SAS RAID Controller - Single--Avago Technologies

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RAID 0/1/5/6/10/50/60
1 x SFF-8087 mini-SAS Internal Connectors
Up to 6Gb/s

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6Gb Megaraid Sas 9271-4I 4Port Pci-Express 3.0 X8 Sas Sata Host Bus AdapterPart#: Lsi00328Manufacturer: Lsi Logic

Model
Brand	LSI
Series	MegaRAID
Model	LSI00328 (9271-4i)
Form Factor	Low Profile

Details
Type	SATA / SAS
Internal Connectors	1 x SFF-8087 mini-SAS
Interface	PCI-Express 3.0 x8
Transfer Rate	Up to 6Gb/s
Cache Memory	1GB 1333MHz DDRIII SDRAM
RAID	RAID 0/1/5/6/10/50/60
Operating Systems Supported	Extensive support includes Microsoft Windows Vista/2008/Server 2003/2000/XP, Linux, Solaris (x86), Netware, FreeBSD, VMware and more. *Visit the LSI download Center for the most complete list of supported operating systems: http://www.lsi.com/channel/support.
Dimensions	MD2 Low profile (6.6" x 2.536")

Features
Features	I/O Processor/SAS Controller: LSISAS2208 Dual-Core RAID on Chip (ROC) Four-port 6Gb/s PCI Express 3.0 SATA+SAS RAID controller Second-generation 6Gb/s SATA+SAS controller, built on the LSISAS2208 dual-core ROC Proven interoperability with the latest server platforms based on the PCI Express 3.0 specification *Cables not included.

Package Contents
Package Contents	MegaRAID SAS 9271-4i RAID Controller (Single) QIG LP bracket

Additional Information
First Listed on Newegg	September 12, 2026

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