Does this work with Dell Optiplex 390?

The PEX1S553LP will work on any low profile / standard profile computer with an available PCI Express x1 slot or larger. As long as the computer has a PCI Express x1 slot or larger, the PEX1S553LP will work. Atha, StarTech.com Support

Does this card work with a dell optiplex 3040 sff?

The PEX1S553LP will work on any low profile / standard profile computer with an available PCI Express x1 slot or larger. As long as the computer has a PCI Express x1 slot or larger, the PEX1S553LP will work. Atha, StarTech.com Support

Is it necessary to connect the molex cable for it to work?

No if you are using windows 11 it won't work it seems even if you install the correct drivers it still won't work windows 11 has problems with serial ports

Will this work to connect an apc sua2200 ups?

The PEX1S553LP will work with RS232 Serial devices, which would include APC models that have serial connectivity. Brandon, StarTech.com Support

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⚙️ Upgrade your legacy gear with next-gen serial power!

SEAMLESS DATA HANDLING - 256-byte FIFO buffer ensures uninterrupted, lag-free serial data transfer every time.
PLUG PLAY VERSATILITY - Includes both low profile and full profile brackets for effortless installation in any desktop or server chassis.
OPTIMIZED CPU EFFICIENCY - Native single-chip design reduces CPU load by up to 48%, freeing resources for your critical applications.
BLAZING FAST SERIAL SPEEDS - Experience lightning-fast RS232 communication up to 460.8Kbps, perfect for demanding data tasks.
CROSS PLATFORM COMPATIBILITY - Works flawlessly with Windows and Linux systems, future-proofing your connectivity needs.

The StarTech.com PEX1S953LP PCI Express RS232 Serial Adapter Card delivers ultra-fast 460.8Kbps serial communication via a single DB9 port, featuring a 256-byte FIFO buffer and a native single-chip design that reduces CPU load by nearly half. Compatible with Windows and Linux, it includes both low and full profile brackets for flexible installation in desktops and servers, making it ideal for industrial, scientific, and legacy device connectivity.

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Compatible Devices	Personal Computer
Operating System	Windows 7
Hardware Connectivity	PCI
Item Weight	0.04 Kilograms
Item Dimensions L x W x H	4.1"L x 3.1"W x 0.8"H
Style	Card

StarTech.com 1-port PCI Express RS232 Serial Adapter Card, PCIe to DB9, 16550 UART, Window/Linux,TAA - [New Version: PEX1S953LP]

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