what thermal paste is on it?

The paste was more than enough but as Travis stated it was nothing special. I too left it on ... but if you have a favorite brand ... I would go with that instead.

Does this cooler come with the liquid already in the radiator or a bottle of liquid to put into the radiator or is it something you have to be extra?

It comes with liquid already in the radiator.

Will this work on a 5900x ryzen 9 zen 3 processor?

5900X uses AM4 socket. This cooler supports AM4 as stated in the specs list.

Is this aio expandable?

No. What you see is what you get.

Questions & Answers: Fractal Design Celsius+ S24 Prisma PWM ARGB 240mm Silent Performance Slim Radiator AIO CPU Liquid/Water Cooler, LGA 1700 Ready / AM5 Compatible

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Fractal Design Celsius+ S24 Prisma PWM ARGB 240mm Silent Performance Slim Radiator AIO CPU Liquid/Water Cooler, LGA 1700 Ready / AM5 Compatible

Fits Intel LGA 1700, 1200, 1150, 1151, 1155, 1156, 1366, 2011, 2011-3, 2066
Fits AMD Socket AM2, AM2+, AM3, AM3+, AM4, AM5, FM1, FM2, FM2+, TR4
Glass capped pump face with backlit logo and ARGB LED effects
Dual auto/PWM modes for balanced performance and full user control
ARGB-enabled PWM hub places all fan connections directly on the rad
Sleeved tubing discretely routes fan power and ARGB through the pump
Prisma ARGB PWM fans deliver brilliant lighting effects
Pre-applied thermal compound guarantees optimal coverage
Asus AURA, Gigabyte Fusion, MSI Mystic Light, ASRock Polychrome support
Compatible using updated LGA 1700 bracket, contact Fractal support to request one if using an older version

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