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There is such a configuration: MSI A320M PRO-M2 V2 + AMD Ryzen 5 1400 BOX and there isn't any separate video card. When the PC is switched on, the monitor shows nothing. The MSI tech support said:
There is no GPU in the CPU Ryzen 5 1400, and the onboard VGA port cannot work with this CPU. It is necessary to install a PCIe graphics card.
And added that
Whether it is Intel motherboard or AMD motherboard, the onboard integrated GPU is in the CPU, not in motherboard. The motherboard only provides the display port. There is no GPU in the Ryzen Summit Ridge CPU; only Raven Ridge and Bristol Ridge CPUs support a GPU.
What I don't understand is that I have another configuration, ASRock 960GC-GS FX + AMD Phenom(tm) II X4 810. Again there is no separate video card. As I found out, AMD Phenom(tm) II X4 810 doesn't have any GPU. But the video works and this question I post using this configuration. How can this be explained?
4Your Ryzen system probably could boot headless, as a server with no graphics output. (i.e. not having any graphics hardware at all probably doesn't stop it from booting. But it makes it hard to configure the BIOS.) – Peter Cordes – 2019-06-11T17:25:50.773
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FWIW, the specs of the motherboards seem to be rather clearly written on this. The 960GC-GS FX says "Graphics: Integrated AMD Radeon 3000 graphics" while the A320M PRO-M2 V2 says "Onboard graphics: (...) Only support when using Ryzen ™ with Radeon ™ Vega Graphics/ Athlon ™ with Radeon ™ Vega Graphics and A-series processors."
– ilkkachu – 2019-06-11T17:43:43.773<pedant>CPUs and GPUs are different components, AFAIK; neither contains the other, but they may both be present on the same board.</pedant> – Agi Hammerthief – 2019-06-13T06:59:30.110
11@AgiHammerthief: You're wrong; many modern CPU's do in fact contain an integrated GPU. That's the exact case we're dealing with here. – MSalters – 2019-06-13T09:20:40.873
4I once had a disagreement elsewhere on what exactly is a “CPU”. The other person argued that basically only the ALU is the CPU, denying cache, PCIe lanes, ... are part of it. My takeaway: It’s pointless to argue about this. – Daniel B – 2019-06-13T16:43:25.263
The old Cyrix MediaGX processor family was claimed to have integrated graphics. As it turned out, the "companion chip" installed on all MediaGX-compatible motherboards actually contained the GPU. This was back before integrated graphics became ubiquitous. – Kriston – 2019-06-13T20:19:20.033
@DanielB They were partially correct. PCIe lanes (assuming you're talking about the PCH) are not part of the CPU, but part of the chipset, the physical chip that you mount onto a socket. That chipset contains many components, including the CPU(s), the shared cache, the PCH, ICH, MCH, CSME, integrated GPU, etc. However it's not correct that only the ALU makes up the CPU. It's been a long time since the physical chipset could be called a plain CPU. – forest – 2019-06-15T08:06:38.240