GTX 280 on PCI-E 1.1

I have a P35-DQ6 that's almost a year old ,
I think the motherboard has a PCI-E x 16 1.1 interface,
With the dropping prices, I'm offered a GTX280 at a good price and I'm thinking of buying it.
Back in the 8800 days , the performance difference was in the range of 1-3% (unnoticeable, if not non-existent and caused by other factors), but now as the cards have progressed
will i see significant difference between both interfaces?

I also have a question about the power, since the PCI-E 1 draws only 75W from the motherboard , as opposed to 150. Is that a problem ?, given of course there's no problem with the psu wattage ...

You don't need a new mobo, just get the card you want, +1 for 4870, and pop it in and connect the 2x 6pin power connectors.
The pcie bus won't hold it back much, ~5% at most

+1 choose whatever card you want, although the 4870 is at a better price point.

concrum. look at this and then tell me the GTX 280 is better than dual 8800GT at crysis.
http://www.anandtech.com/video/sho [...] =3341&p=13

I have been thinking, a similar question, ATI 4870, , GTX 260, both have come down to the same price at LCS or even a couple of 9800 GTX+ SLI (although this would be some more money)

You could consider the 9800GT's.

9800GT supposed to be faster than 4870 in every games, especially Crysis.

I wouldn't worry too much. A Pcie x16 slot (1.1) is enough for a GTX 280.

Selling a graphics card that would not work properly in a PCIe x16 (1.1) slot due to lack of power or bandwidth would have been a very stupid choice by either GPU maker since the majority of computers still have 1.1 pcie slots.

It might take a slight performance hit - but you shouldn't see it like that. It's better to think that PCIe 2.0 will give you a slight performance boost. A neglectible amount though.

I've seen GTX 280 for as low as $420 here in Canada. Their price vs performance is getting better. As for 8800gt SLI beating a Single 280, well that may be true.. but then you need a crappy nvidia chipset.

Honestly, I'd rather buy a 4870 or wait for the X2, I do realize its much better btw.

I still think however that the 280 isn't that bad a card, but i wouldn't consider it if i were buying a new 280, due to the horrific price/performance (even after the 150$ drop) ....

I'm being offered a deal from a friend and i might exchange the card back in a couple of months so its not exactly about getting a new 4800 card or SLI'ng a couple of 8800GT's , I was just wondering about the interface , thanks for your answers ..