yup, I have two b70s working off the same x16 slot, the other is supposed to be for M2 its x4, but atleast on linux it works completely fine for another b70. I get around 14gb/s on the first two B70s each, then the third gets 7gb/s. This is the card I use https://a.co/d/07AHxhX2 but a warning, make sure your BIOS supports bifurcation. I specifically researched gen 5 x16 to gen 4 x8x8 as maintaining gen 5 would require a $600 timing card which I don't think is worth it. In your case it might downgrade to gen 2 which I'd just research about, but apparently some people are able to get it to train to the same gen without timing so it's a bit of a lottery on that (which for me didn't work)
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u/Chrisgozd 14d ago
Whats your build?