There are newer things in OGL that would be faster on the 260x because of it's OGL 4.3 support.
While the 6850 has double the memory bus width, the 260x has 1.6 times the effective memory clock, and is based on a newer, faster architecture, along with being more overclockable (iirc, something so minute that I shouldn't need to look it up, though).
The 260x will also be relevant to the industry for two years longer, making it a slightly more future-proof upgrade at this point.
I'd say get the 260x. The 6850 doesn't offer much over it (other than double the bus width), unless you're playing PC games.
While the 6850 has double the memory bus width, the 260x has 1.6 times the effective memory clock, and is based on a newer, faster architecture, along with being more overclockable (iirc, something so minute that I shouldn't need to look it up, though).
The 260x will also be relevant to the industry for two years longer, making it a slightly more future-proof upgrade at this point.
I'd say get the 260x. The 6850 doesn't offer much over it (other than double the bus width), unless you're playing PC games.
in a perfect world we would all be piles of sand with no ability to form coherent bodies of body