I'm not sure that is correct. AMD does not produce any motherboards nor chips for the boards as far as I know. AIB companies do and they have their contracts with components suppliers. AM5 uses DDR5 ram and price for the chips cannot be blamed on AMD since they do not produce the chips to make DDR5 modules. I think same applies for the motherboards.
Below you have top chipset manufacturers. AMD is not even listed.
Top 20 Largest Motherboard Companies by Revenue
Here is a complete list of the top 20 motherboard companies ranked just by their revenues last year.
Rank | Motherboard Manufacturer | Revenue (USD millions) |
1 | Intel | 71,900 |
2 | Asus | 12,110 |
3 | Acer | 8,112 |
4 | MSI | 4,000 |
5 | Gigabyte Technology | 1,940 |
6 | AOPEN Inc. | 1,570 |
7 | Elitegroup Computer Systems | 927.11 |
8 | Sapphire Technology | 590 |
9 | ASRock | 329.5 |
10 | American Megatrends | 175 |
11 | Leadtek | 170 |
12 | Biostar | 147 |
13 | Shuttle Computer Group | 138 |
14 | PNY Technologies | 124.84 |
15 | Chaintech | 97 |
16 | EVGA | 65 |
17 | Zotac | 50 |
18 | First International Computer | 37 |
19 | NZXT | 29 |
20 | XFX | 10 |