I have a relatively old prebuilt system that has no m.2 slots on the motherboard. I found online some pcie cards that can solve this issue. However i am not sure of the specifications on my motherboard since it's proprietary hp hardware. All i know is that the pcie slot is the same size on the motherboard as it is on that card. My question is, provided that the pcie slot is not up to spec with the card, will the card just run slower or will it not run at all? If i put an m.2 inside it, will i at least get some improvement over sata?