Pcie risers

[Jama]

Hello all.

I am fairly me to the game and have a few small gpu rigs running.
I am only making use of the x16 slots.

I have done a bit of searching around the forum and have seen I can make use of the x1 slots by risers
I just have a few questions regarding this.
In case it varies by cards the cards will be 5870's or 5830's in the x1 slots

1) do all motherboards allow gpus in the x1 slots?
2) If I get x1 -> x16 risers and power via the 6pin atx plugs I should not need a molex model should I. ?
3) I have seen people just using x1 -> x1 risers for a x16 cards with a mention of cutting the socket, is there any benefit to this? Also is there a page which shows which part to cut

I have spent a while searching but could not find an exact answer to the above few questions.

Thanks in advance.

[marcetin]

1) do all motherboards allow gpus in the x1 slots?
2) If I get x1 -> x16 risers and power via the 6pin atx plugs I should not need a molex model should I. ?
3) I have seen people just using x1 -> x1 risers for a x16 cards with a mention of cutting the socket, is there any benefit to this? Also is there a page which shows which part to cut

1) yes
2) it depends how much gpus are you using, how much power you need to supply thru mothrboard, power goes thru first pins of pci-e slot
3) I am not sure about this