Is this good for an 870e apex ryzen 9 9950x3d cpu motherboard combo

Yes, it supports AMD AM4 and AM5 sockets, which includes the Ryzen 9 9950X3D CPU.

Which CPU sockets are supported by this cooler?

It supports Intel LGA 1851, 1700, 1200, 115x, and AMD AM4/AM5 sockets.

What is the pump speed of the Phanteks Glacier One 420D30 X2 AIO Liquid CPU Cooler?

The pump speed is 3100 ± 10% RPM with a 100% duty cycle.

Questions & Answers: Phanteks Glacier One 420D30 X2 AIO Liquid CPU Cooler, Evolv X2 Aluminum Cap Design, 3x Performance D30-140 D-RGB Fans, for Intel LGA 1851, 1700, 1200, 115x and AMD AM4/AM5 sockets, Black

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Phanteks Glacier One 420D30 X2 AIO Liquid CPU Cooler, Evolv X2 Aluminum Cap Design, 3x Performance D30-140 D-RGB Fans, for Intel LGA 1851, 1700, 1200, 115x and AMD AM4/AM5 sockets, Black

High-performance cooling solution designed for gamers and PC enthusiasts.
Equipped with D30 fans that can interconnect into a single frame for easier cable management.
A large copper base and fin array ensures efficient cooling for high-end CPUs.
Maximum clearance design for compatibility with motherboard and RAM components.
Evolv X2-design aluminum pump cover with integrated fan cools surrounding VRMs and M.2 SSD.
Supports Intel LGA 1700, 1200, 115x, and AMD AM4, AM5 sockets.

$179^.99 –