user52170: I have motherboard with 3 Regular PCI slots beside 3 PCI-Express slots. (https://www.asus.com/Motherboards/M4A88TDV_EVOUSB3/specifications/)
Can I Hook Up 3 RX-460 to Regular 3 PCI Slot via PCI-E Riser USB?  Will it be stable?

user51425: No.  PCI and PCI-e are two entirely different things.  PCI is a more traditional parallel data channel, while PCI-e is a serial data channel (that can have multiple parallel "lanes").  
You cannot plug PCI-e devices into PCI sockets.
If you're desperate, you can try the mechanism specified here, no guarantees though :)
https://www.youtube.com/watch?v=5vDHACwXSxE

52170: <p>I have motherboard with 3 Regular PCI slots beside 3 PCI-Express slots. (<a href="https://www.asus.com/Motherboards/M4A88TDV_EVOUSB3/specifications/" rel="nofollow noreferrer">https://www.asus.com/Motherboards/M4A88TDV_EVOUSB3/specifications/</a>)
Can I Hook Up 3 RX-460 to Regular 3 PCI Slot via PCI-E Riser USB?  Will it be stable?</p>
 51425: <p>No.  PCI and PCI-e are two entirely different things.  PCI is a more traditional parallel data channel, while PCI-e is a serial data channel (that can have multiple parallel "lanes").  </p>

<p>You cannot plug PCI-e devices into PCI sockets.</p>

<p>If you're desperate, you can try the mechanism specified here, no guarantees though :)</p>

<p><a href="https://www.youtube.com/watch?v=5vDHACwXSxE" rel="nofollow noreferrer">https://www.youtube.com/watch?v=5vDHACwXSxE</a></p>
