Can I replace the stock CPU cooling system with a Noctua LGA 1151 setup?

[Zakth]

I have the Omen Obelisk 875-0034 with a 9th Gen Intel i7-9700. I want to replace the stock cooling system with the Noctua NH-U9S which supports socket LGA1151 and measures 125MM total height (from motherboard).

• What is the max height of a CPU cooling tower with this case? By my estimate it's about 152mm but I want to be sure before ordering.
• Can we access the back of the motherboard to install the required mounting solution for the Noctua?
• Does this case have any  front fans? I only see the rear fan and the CPU fan.

[Fanordi]

Hello, it is not indicates the maximum height, but normally it is standard because you have a really microATX motherboard, and if you have measured you will can installed this fan system. 

For access to the system attach at the bottom on your motherboard, you can try opening the side panel using this document, however you just need to remove all the motherboard: 

http://h10032.www1.hp.com/ctg/Manual/c06523595

https://www.fonerbooks.com/r_mother.htm

And in effect you don't have other fan in this PC, but it is not too hot it is not a problem. If you want to install an other one you can check in your box if you can screw it, and mesure the diameter.

If you don't have the connector on your motherboard you can use an adapter for duplicate the rear fan connector:

https://www.amazon.com/Rosewill-Splitter-Duplicator-Converter-Adapter/dp/B076HBQTD5/ref=sr_1_1?keywo...