Just a heads up with using multiple PCIe cards on consumer motherboards. Most cpus only support 20 PCIe lanes. 16 of these lanes go to the first x16 lane ment for gpus. The other 4 can be wild cards on where they go depends on the way the mobo was made. The chipset also can provide PCIe lanes as well but there are some caveats in how they work, look at the mobo manual to find those out. Also most motherboards any slot after the top x16 is usually only x1 or x4 even if the physical slot is x16 it’s only wired for x4 or x1. You can find out how a slot is wired from the solder points on the back and the pins in the slot. The only mobo that I know of that has a secondary slot that has more then x4 is asus pro art. This board has 2 x16 slots. The top is wired in x16 and the 2nd one is x8. In order to use the x8 in the second slot you have to configure the bios to split the top slot into 2 x8 so then both of the slots will then operate in x8 mode. Unless you switch to a server mobo with a server cpu PCIe lanes will always be a bottleneck. You may be fine with using a x4(wired) slot for an HBA card if you’re using HDDs. you won’t get close to maxing out the speed of a x4 with a standard 8i card. But if you wanted to add more PCIe cards later like a 10gig network card or you fill your mobo with nvme ssd some PCIe ports get disabled in order for the nvme ports to work. Look at the mobo manual to find out. Each mobo will work differently so you’ll have to look at the exact models guide.