gtx 260 vs gtx 280 cuda considerations

As far as I can see, the GTX 260 has >80% of # of SMs, bandwidth, and ROPs as the GTX 280. Are there any other considerations which would make the GTX 260 perform less than 80% the speed of the GTX 280 (assuming 896 MB of memory is fine)? The GTX 260 appears to be ~60% the price now, seems to be a bit better in power consumption and noise, though the review sites seem to vary a lot. I am guessing the differences are because of the sites, not the models – correct? They all have the stock fan and heatsink now, right?

[url=“Technology News, Products & Gadgets Reviews, Latest Tech Updates - HardwareZone Singapore”]Technology News, Products & Gadgets Reviews, Latest Tech Updates - HardwareZone Singapore
[url=“Noise - Nvidia GeForce GTX 260/280 Review | Tom's Hardware”]http://www.tomshardware.com/reviews/nvidia...80,1953-26.html[/url]
[url=“Temperatures, Overclocking - Nvidia GeForce GTX 260/280 Review | Tom's Hardware”]http://www.tomshardware.com/reviews/nvidia...80,1953-27.html[/url]
[url=“Nvidia's GeForce GTX 280 graphics processor - The Tech Report”]http://www.techreport.com/articles.x/14934/16[/url]