Motherboard Q: Do mobos without vrm's for igpu work with apu's?

[Kamiii]

I'm looking to buy the asus x370-I, since it has a six phase design over the asrock x370 itx/ac. But if ryzen+ are apu's, how would that work with the asus mobo? Since it has no vrm's for an igpu.

 

[SeñorDonut]

I don't think iGPUs require separate VRMs. However, the X370-I does not have any video out ports, so you will still need a dGPU.

 

[EdZ]

IIRC the VRMs all feed the same suply rail (Vcore). There is no 'dedicated' VRM or voltage rail for the iGPU, which is also why motherboards can have any number of power phases feeding the same CPU. More phases in theory improves stability, but in most use cases as long as the minimum number of phases to meet ripple spec are present (fewer than you'd think) and those phases are rated to handle the load, then everything is fine.

 

[confusis]

This^