wheresmycar

Sometime ago I helped my relative upgrade his CPU, Motherboard and RAM with Zen 3 in mind and would hate to realise if limitations apply for other impending upgrades. My relative currently has the MSI MPG B550 GAMING PLUS board which lists the following specification for PCIe 4.0.

PCIe 4.0 is the next evolution of the ubiquitous and general purpose PCI Express I/O specification. The interconnect performance bandwidth is double that of the PCIe 3.0 specification achieving 16GT/s and compatibility with software and mechanical interfaces is preserved. Super kirby 64. For now, PCI Express 4.0 is the fastest specification available for home computers. However, PCI Express 4.0 is only supported by AMD on its latest motherboards that are based on the X570 chipset paired with AMD Ryzen processors from the third generation. Yu-gi-ohpower of chaos trilogy. Unless you have these, there's no point in buying graphics cards or solid-state drives. Cisco webex add-on.dmg. The delivery of the PCIe 4.0 specification to the industry is an important addition to our spec library as it delivers high performance 16GT/s data rates with flexible lane width configurations, while continuing to meet the industry’s requirements for low power. Additional functional enhancements include.

1x PCIe 4.0/ 3.0 x16 slot (PCI_E1) 1
1x PCIe 3.0 x16 slot (PCI_E3), supports x4 speed 2
2x PCIe 3.0 x1 slots

The supported specification depends on installed processor.
When installing PCIe SSD in M.2_2, PCI_E3 slot will be unavailable.

Does this mean the graphics card slot 100% supports PCIe 4.0 out of the box?
In reference to 'supported specification depends on installed processor' .. is the Ryzen 3600 fine for 4.0? (not a huge concern, as he's looking to upgrade to a 8-core Zen 3 processor later)
If 20GB VRAM variants (3080) come into existence, are these cards more likely to benefit from 4.0 scaling? The 10GB variant doesn't see much benefit as seen in one of TPUs excellent reviews https://www.techpowerup.com/review/nvidia-geforce-rtx-3080-pci-express-scaling/ hence wondering whether more VRAM means 'considerably' more PCIe bandwidth consumption?

Pci_express_base_4.0 Pcie 4.0 Specification 1.0

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Not sure if the following will help but here's his current build and what he's looking to upgrade:
CURRENT:
CPU: 3600

Pcie 4.0 Specification

MOBO: MSI MPG B550 GAMING PLUS
RAM: 16GB (2x8) 3600/16
GPU: older GTX 1070

Pcie Base Specification 4.0 Pdf

PSU: older 550W unit
Displays: older 1080p 75hz panel + 1080p 60hz
IMPENDING UPGRADES:
RTX 3080 / Next Gen AMD cards (3080 20GB variant if reasonably priced and announced in the coming weeks/month)
750W PSU

8-core Zen 3 upgrade (later)
4K 144hz display

Pcie 4.0 Base Specification

Pcie 4.0 Specs

(he will be using the 4K display for gaming and the 2 1080p displays for multi-tasking)