You need to stop talking out your ass like you think you know something.
Great, you got it to work with ONE card, or two... You are running over POWER if you have more than 3 cards... So stop acting like you know what you are talking about. He said a "regular old motherboard", not a "Motherboard with PCIe controllers that also have an advanced PCI controller." You use these on a motherboard without a PCIe controller? How many at once?
You DID NOT use more than 3x 7970's... you may have gotten one or two to work, and run crappy.
I said "MIGHT"... I was not talking out my ass... I have dealt with those "types" of adapters before. They are real specific. You were not. Thus, my expressed concern.
Glad to see you cleared that up for them. But what I said still holds true.
In the end, it is still a PCI, at the lowest component. Great, if PCI is all you have left for connections. However, it would just be better and cheaper to buy a board with 6-8 PCIe slots.
Sorry, would you rather that I have just mislead everyone into thinking that ALL those kinds of PCI->PCIe risers are equal? Like you are doing.
That SPECIFIC card states... "PCI Express Specification Version 1.0 Compliant", Thus, not PCIe 1.1, 2.0, 2.1, or 3.0 Great you have ONE card/mobo that is compatible. Not all cards/mobos are. I can name many that are not... I have them all right here. Your graphics card states, "must use a 2.1 or greater", or "must use a 3.0" slot for a reason... You have no clue what damage you are going to do... Great, it works for a few hours, or a month... then what, smartass?
And THAT card, has NO POWER... (That is the other reason it is not greater than 1.0, which has higher power requirements. Doesn't matter if you added power... That card alone, does not PROVIDE it. So STFU, and stop acting like you know what the hell you are talking about. Did you even read the OP's post, or read about THAT riser? You do realize there are more than one of those types of risers, correct?)