Installation of Noctua NH-U9B SE2 CPU cooler for XPS8300

Dell has proprietary cooling and therefore I would say no its not going to fit nor is it going to work as the system will shutdown with Fan Failure message since the fans are not standard.

Thanks for your advice, can I use any convert or adaptor between 3pin to 4pin to solve the problem?

The Dell proprietary CPU cooling fan has addtional electronic components on it and it "reports" to the BIOS.  It's not a simple matter of a connector adapter.

In the past you would get a fan error if you try to replace the Dell cpu fan with an aftermarket cooler. The Dell fans use to have a temp sensor built in on the older models like the Dimension-3000's that caused this.You can buy coolers that have a 4-pin fan like some of the Zalmans models that you can power off the motherboard on the newer Dells though.If you want to use the Noctua that has 3-pin fans this is how i would hook it up i would power the two Noctua fans straight from the power supply using a power adapter and remove the Dell fan from the heatsink and move it to the front of the case and keep it powered off the motherboard you can buy an extension adapter to relocate the fan.

I use Zalman ZM-MC1 Multi-connector to power the fans off the power supply but if you still have the Dell power supply it probably want have molex only SATA.

Here is what the extension looks like to relocate your Dell fan.

Thk for your pictures, I had convert 3pin to 4pin for cpu fan. But I worry the base frame of cooler cannot fix on Dell's motherboard than the fan.

Hmm,i may try it myself when i get time to change back to the Dell motherboard.The only difference i see in the Dell motherboard  is threaded inserts where the heatsink mounts.