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Assuming that's the Ultra 120 Extreme...
While the heatsink its self is capable of cooling the i7-9700F the Ultra 120 Extreme does not come with LGA115x mounting hardware. If you can fabricate the appropriate hardware than it would work fine. Otherwise you will need to look into a different cooler. 100°C is hitting the TJunction for that processor and you are likely thermal throttling so you definitely need to address this.
EDIT: The top recommended value cooler here is the Cooler Master 212 EVO. I'm partial to the 212x as the upgraded fans are a little quieter and will last longer. For my money that's worth the small premium over the std EVO. Other coolers that get a lot of love here are the Thermalright Macho 120, Thermalright TRUE Spirit 140, Phanteks PH-TC12DX, and the Noctua NH-D15.
Of course you will need to verify fit as some of these coolers are quite large.
P.S. to OCF!
I’m kind of excited. When my mount arrives I will pit the Ultra 120 Extreme up against Le Grand Macho RT and True Spirit 140 Power on my daily rig. The only 120mm fans I have are 120x38s.. so not a fair comparison exactly, but it should do ok up against the new iron. I have nothing but good memories with that cooler. Not sure why I left it behind for a CLC. Ahh well. It probably won’t be as good as what I’m used to, but it should be pretty dam close.
I’m kind of excited. When my mount arrives I will pit the Ultra 120 Extreme up against Le Grand Macho RT and True Spirit 140 Power on my daily rig. The only 120mm fans I have are 120x38s.. so not a fair comparison exactly, but it should do ok up against the new iron. I have nothing but good memories with that cooler. Not sure why I left it behind for a CLC. Ahh well. It probably won’t be as good as what I’m used to, but it should be pretty dam close.