Why doesn't it fit? i have a dell optilex microtower. 4 pcie slots. but this is about 4.5" in size. the insertion slot on the tower is only about 2.5"

This is a full-height expansion card, whereas your microtower (as suggested by the name) only has half-height/low-profile expansion slots. From the product listing: "2. This USB PCI-E card is only compatible with standard-sized tower cases (not mini computers)." So it's plainly obvious from both the manufacturer's description as well as a cursory glance at the product photos that this would not fit a slim/mini/micro/etc. desktop.

What does it mean for does not support pci slot? What does it attach to then?

It doesn't support a PCI slot from 1992. It supports a PCIe X4. This is a very common connector over the past 10 years. The connector on your motherboard is around an inch long. I hope this helps.

I bought this card and something interesting is happening. when i plug 3.0 devices, they work just fine. but when i plug 2.0 devices, nothing happens?

Have you installed the latest drivers. For me the drivers on the CD did not work at all. I had google for new drivers. I was able to get to work with a USB 2.0 external hard drive no problem.

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The ELUTENG PCIe USB 3.0 Expansion Card adds seven high-speed USB 3.0 Type-A ports to your PC via PCI-E slots, delivering up to 5Gbps transfer speeds. Featuring NEC chips and solid capacitors for stable power delivery, it supports Windows 11/10/8/7/XP and Linux, enabling hassle-free connectivity expansion without external power supplies.

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Brand	ELUTENG
Manufacturer	ELUTENG
Model	e49c8051-a004-46ea-b043-73cb716a5c01
Package Dimensions	15.7 x 13.1 x 2.7 cm; 120 g
Item model number	e49c8051-a004-46ea-b043-73cb716a5c01
Operating System	Windows 11
Hardware Interface	PCI
Compatible Devices	Personal Computer
Number of items	1
Batteries Included	No
Batteries Required	No
Does it contain liquid?	No
Manufacturer	ELUTENG
Item Weight	120 g

ELUTENG PCIE USB 3.0 Card 7 Ports PCI Expree to USB Expansion Card Super Speed 5Gbps PCI-e USB3 Hub Controller Adapter for Windows 11/10/8/7/XP/Vista

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