The maximum throughput of Intel's Columbiaville NICs is 100G max. When the 2nd port is used the total bandwidth is split in half, so there will be two 50G links. The 2nd port is usually in stand-by mode when the 1st port is used as a 100G link. So, two active ports on a Intel 100G NIC does not result in 200G throughput.
Intel's E810 based NICs require only a PCIe3.1x16 slot. 16 lanes will accommodate the 100GbE port just fine. Theoretical PCIe throughput for 16 PCI lanes is around 252Gbps. The 800 NIC chipset is just four 25Gb Ethernet lanes stitched together. PCIe4 won't help this NIC much.
When Mac Mini M1 was released I ordered the 8GB model. It was always swapping and memory pressure high. After replacing with a 16GB model swapping decreased but 16GB of RAM is still not enough. Hope Apple will release future models with lot more RAM otherwise the M1 based devices are useless.
The RTX 3070, 3080 and 3090 are still hard to find. A shortage favored by strong demand, excessively long production cycles and the global pandemic, which does not make things easier. Good news however, since a South Korean port operator has just got hold of a lost shipment of 500,000 GeForce RTX 3000 cards!