2 Nvidia Cards in SLI or 2 seperate on crossfire board?

Well they will not SLI so getting a SLI board is pointless, if you on the otherhand can use it as a physX card then all you need is a board with the extra slot.

Cheers for the replies. Sorry i dont think i explained very well. I know the 2 cards are not compatible for SLI, i would have to get another GTX 260 and a new board for that. I'll need a new board for the 2 cards anyway as mine only has 1 pci-e x16.

I'm leaning towards a just a new board and using the cards i have, but what sort of performance enhancement would i achieve from doing this?

Also I would like a the new board to be a gigabyte one and most the ones i've seen are crossfire but that wudnt matter with the cards i have....

So not all games support the the xtra card for physX. Thats interesting. It would be pretty pointless then. So I think a Sli board it is then and hopefully another gtx 260 eventually. Any ideas on a good Sli LGA775 mobo? Dont wanna spend too much, have been looking at boards on ebay, Asus P5n-e P5-d seem pretty good for the price, anyone know which chipset is best? I've noticed there are 680i's 780i's from Nvidia. I suppose in general the chipstes get better as the no's go up?

So been as i have a Q6600 which is 65mn and only really need the 2 PCI-E for sli (not gonna need nemore) then a 680i should be ok with no real less performance? Any one have any suggestions for a good mobo? Dont really wanna be spendin to many bucks, the asus striker II looks pretty popular but thats a bit more than i wanna spend.

p.s sorry if i'm talking about old hat but i cannot really justify a total upgrade to icore's, ddr3 etc at mo

Not all 650i boards are SLi capable.

http://www.nvidia.co.uk/page/desig [...] ultra.html

The MSi is def Sli capable and the board is like £30 cheaper than the other 2, but the Asus n EVGA are 3-way, (i heard u cant beat a bit of 3-way lol), which is temptin, but seriously, i've heard that that triple sli, as cool as it sounds really isnt that great. Also strangely for Asus the P5N-T is a bad overclocker.

Is that to do with the total bandwith used by the cards? So 2 x8's is still better than 1 x16?

Thats good enough for me. Or was until i found the board i was sent didnt work So i've got to start looking again, i've seen an asus p5n72-t which as far as i can tell is identical to a Striker ii almost. I might have to open another thread on best sli 775 boards, i dont know this subject has probably been done to death already?

http://www.geeks.com/details.asp?InvtId=P5N-D-BO-R

Well if it's broken geeks will send you a prepaid shipping label to send it back so there's not much risk with them, and it's cheaper than a used one.

I looked at that board after I posted it though and the x16 slots are only 1 slot apart so I don't really recommend it.

http://www.ebay.com/itm/MSI-P7N-SL [...] 20bd45b0d8

That's the one I have, it's got an extra slot between the first 2 x16s so you don't have to have your cards crammed together. I don't think you will find any new socked 775 SLI boards, if you do they will be 200 bucks.

That board isn't made by Acer, it's an OEM part made for Acer by MSI, it's pretty much the same as the MSI P7N Diamond but doesn't have the soundblaster X-Fi extreme. I had that same board and I had some problems with the heat pipe that runs behind the PCI-E slots keeping my graphics cards from being able to seat in the slot so I ended up returning it.

I was using a pair of GTX 465s. One EVGA one Palit, the Palit fit, the EVGA would not (and yes I could have run the palit as the primary card but didn't want to for a variety of reasons). The problem is where the 2 heat pipes are stacked on top of each other where they run behind the top slot from the northbridge to the PCI-E controler and the southbridge. By stacking 2 together it makes it too thick and I couldn't push the card all the way down to seat it because the edge of the cooler and PCB was hitting the pipe. I guess I could have flattened the pipe out, it was just lacking a few mm in clearance, but I didn't feel like hammering on a motherboard and killing the warranty so I just returned it.

It's where the pipes turn and head down and run underneath the graphics card that gave me problems, they stuck out too far from the board and I couldn't push the card all the way in.

OK, decided against the p7n. Have been looking to upgrade to an i core but is just a bit too much at mo. Am now looking at an EVGA 790i sli ultra, but keep thinking about the p5n72-t board, i cant find much about them online apart from the official site. Does anyone have any experience of these boards??