Possible to Mine RavenCoin w/multiple older GPUs?

I'm a newbie to mining.

I've got a bunch of old EVGA video cards. Mostly GeForce GTX 460 and GTX 660Ti. They're all either 1gb or 2gb of ramm. Can they be used with 3-way or 4-way PCIe splitters and risers to mine Ravencoin?

Is one card with at least 3gb or 4gb REQUIRED to mine RAV?

TY for any help.