Both cards should perform well but the 4870x2 will take the lead by a bit.
There is no point in adding 2 4870x2 because they dont scale well at all.
In my opinion if you dont mind spending a little more the 4870x2 would be the way to go but the gtx.260 sli shouldnt be to far off.
Do you like to play games such as crysis and farcry 2? they tend to play better on nvidia cards
The performance from the 4870X2 is slightly greater, and it costs slightly more than GTX260 so value wise it's the same.
I would go with the 4870X2 because you will not be forced to get an SLI motherboard, as you would be with GTX 260 SLI. The nvidia chipsets on average tend to not overclock well, among other things, and are more expensive than necessary.
The money you would spend on the nvidia motherboard will probably negate the amount you would save by going with the SLI configuration anyways.
the 4870x2 only requires one pcie slot. quad gpu isnt optimized and probably wont me till the next 2 gen in my opinion. stick with your mobo and just get the 4870x2. as for ur psu that psu should be able to handle it. the 4870x2 does not require pcie2.0 1.1 is fine.
So I purchased the monitor and the 4870 x2. I can run any resolution on my desktop, but when I am in game, it runs for like a minute then the system reboots. I've tried several games and the same thing happens. This tends to only happen at higher resolutions.
Could it be that my power suply is not up to the task? Any way I can tell?
I cranked up the fan to 100% on the card so it can't be overheating.