PCI Compatibility

After a couple years of serving me well, my EVGA 8800GTS 640mb has finally given out. I'm now going to be upgrading and looking toward either a GTX 260 or 275 (leaning toward the 275, possibly this one or this one, the preformance for cost strikes me well).

My motherboard though is an ASUS P5N-E SLI, which brings up some of my concerns.

From what I've read around, there is backwards and forwards compatability among the PCI-e slots, but I believe in due diligence when throwing my money around. I've kept seeing how there should be no problems with a 1.1 slot, but I've not seen any indication of if the PCI-e slots are 1.0 or 1.1. But to the questions.

Would I have any problems with my motherboard and either of these two cards?

Do you guys have any recommendations for a card that would play well with this motherboard for around the same price range (shooting for around 200 USD, give or take) that I may be overlooking?

Thank you very much for your time, my apologies for such a novice question, been out of the loop for a while.

Does your motherboard set one PCIe slot to 16x when the other slot is empty? I see that it does 8x/8x but as long as it runs one at 16x using the 1.0 spec, you're good to go on either card.

For video cards they're specifically called PCI-e. PCI refers to the older 32bit 33MHz bus standard. If you're using one PCI-e card it doesn't matter what slot switches to what speed or what version of it you have. They're all compatible with each other if it fits in the slot.

also, to add to what they said, you have two PCI-E 8x (16x mech.) slots that are 2.0.

Any video card will work in them as long as it is PCI-E, whether it be 1.0, 1.1, or 2.0.

Thank you very much for your swift answers.

And yes, it is x16 PCI Express (not just PCI, sorry for that ommission) and fit a single 8800GTS that needed PCI-e x16 just fine (never played with SLI). I have gone back and edited the initial post to correct the PCI/PCI-e issue.

It has just been the 2.0 with these newer cards that raised an eyebrow, since I really haven't done much in the way of upgrading my machine for the last couple years aside from little things (budget and a lack of need). So I don't want to be ambushed my a compatability issue after ordering a new GPU.

So from what you guys have said if I am understanding correctly, is that I should not have an issue so long as it can set an x16. Meaning that a card like a this BFG 275 GTX should work just fine with my aging P5N-e. If I have misinterpreted anything, please correct me if you have the time. If not, thank you again for your time--it's good to see the [H]ard forums and its denizens are still as incredible as ever for information.

Again, thanks for your swiftness.

PCIe 2.0 supplies more power than 1.0, but the cards that will physically fit are the same.

ps- does the evga card have a warranty?