windows 10 – What are the requirements for using SLI?

I just had a second graphics card and I wanted to try the SLI.
After installing the latest driver for my cards (the same model and the same chip are identical), I was able to use both.

In one way or another, my system is not happy with these cards at all.

I get significant delays in normal operating mode.
Windows is very late, I can not move or some windows, even the sound is slow.

I've read that RAM must be SLI certified and that the processor may be the problem.

How could I locate the source of the problem?

My current configuration:

If any other details are needed, I will add them! (let me know in the comments).

Things I have tried until now:

  • disable HPET (does not work, does not seem to be active)

Can I use ThunderboltEX 3 instead of GC-Alpine Ridge rev 2.0 on the Gigabyte Z370XP SLI motherboard?

I want to use GC-Alpine Ridge rev 2.0 in Gigabyte Z370XP SLI motherboard as a Thunderbolt connector. Unfortunately, Gigabyte's GC-Alpine Ridge 2.0 2.0 is not available around me. Can I use Love at first sight 3 Expansion card from another provider (eg ThunderboltEX 3 from ASUS) for the same purpose safely?

graphics card – PCIe and SLI slots enabled on mobo

PCIe x16 cards have other uses, such as NVMe M.2 -> PCIe drive cards, more on a card. Therefore, it is justified to build a motherboard, such as the MSI x470 GAMING PRO, without SLI support but with two x16 slots.

Sometimes there is a second 16-bit slot, but not all pins are filled, so it's really a x8 or x4 slot. The motherboard above is changed from x16 to x8 if two 16-bit cards are installed. The same goes for the MSI x470 GAMING PRO CARBON because there are very few data lines available from a given CPU.