擴充卡的規格, 請問這是什麼意思啊?

擴充卡的規格, 請問這是什麼意思啊?
我想要有2組 pcie x8 , 我的理解是 , cpu 用 9000 7000 系列, 會有 2 組 x16 插槽,
可是下方的 PCI_E2 Gen PCIe 4.0 supports up to x2 (From Chipset) 卻寫 x2 , 所以我也不太明白這個規是什麼意思?


2x PCI-E x16 slot (Qty)
• Supports x16/x2 (For Ryzen™ 9000/ 7000 Series processors)
• Supports x8/x2 (For Ryzen™ 8700/ 8600/ 8400 Series processors)
• Supports x4/x2 (For Ryzen™ 8500/ 8300 Series processors)
1x PCI-E x1 slot (Qty)
PCI_E1 Gen PCIe 4.0 supports up to x16 (From CPU)
PCI_E2 Gen PCIe 4.0 supports up to x2 (From Chipset)
PCI_E3 Gen PCIe 3.0 supports up to x1 (From Chipset)

-------------- 另外一種主機板寫這樣, 有看沒有很懂-------
3x PCI-E x16 slot (Qty)
PCI_E1 Gen PCIe 5.0 supports up to x16 (From CPU)
PCI_E2 Gen PCIe 5.0 supports up to x4 (From CPU)
PCI_E3 Gen PCIe 4.0 supports up to x4 (From Chipset)

PCI_E1 & PCI_E2 slots
• Supports PCIe 5.0 x16/x0 or x8/x4 (For Ryzen™ 9000/ 7000 Series processors)
• Supports PCIe 4.0 x8/x0 (For Ryzen™ 8700/ 8600/ 8400 Series processors)
• Supports PCIe 4.0 x4/x0 (For Ryzen™ 8500/ 8300 Series processor)
PCI_E3 slot
• Supports up to PCIe 4.0 x4

* PCI_E1 & PCI_E2 & M.2_2 share the bandwidth, and PCIe version support varies depending on the CPU. Please refer to the PCIe configuration table in the manual for more details.
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