New RAM
New RAM
I believe the RAM operates at speeds around 2600 or 2666 MHz. You should be okay using a faster rate than your motherboard supports, though running it in XMP might not be possible. Adjusting the voltage in the BIOS could still yield good performance.
It should work fine. The card can handle up to 64GB across its four slots. However, mixing different RAM types isn't recommended unless you're testing it—otherwise it could cause issues. The safest bet is to try it, but if it fails, you might be able to upgrade by replacing the existing RAM with two of these sticks.