Possibly the ThinkPad X13s is what you're after? Or laptops don't count (I guess you did say desktop). If your definition of PC is "runs Windows" there's a bus

Possibly the ThinkPad X13s is what you're after? Or laptops don't count (I guess you did say desktop). If your definition of PC is "runs Windows" there's a business reason Apple silicon doesn't. It's rumoured to be because Microsoft made a deal with Qualcomm: https://www.macrumors.com/2021/11/22/microsoft-qualcomm-arm-windows-exclusive-deal/ https://www.macrumors.com/2021/11/22/microsoft-qualcomm-arm-... So if you want to buy (or build...) an arm PC with Windows then as of today it had to come with a Qualcomm SOC. So I think the TL;DR answer for your question is really "because Qualcomm aren't super interested in the desktop market". I think there are now some "mini PCs" but they are not internally expandable etc. There are no major technical blockers to slapping a Qualcomm dev kit in a desktop case but the experience is not gonna be that great.