so da ich mich jetzt doch dazu durchgerungen habe eine 2. GTX 260 zu bestellen, habe ich mal den Support von NVidia angeschrieben, ob man 55nm mit 65 nm koppeln kann oder 192 mit 216 streamprozessoren, hier die Antwort:
Thank you for contacting NVIDIA Customer care.
This is Shailendra, assisting you in this query.
I understand that you would like to know if you can enable SLI using a GeForce GTX 260 with 192 processing cores 55 nm
and
a GeForce GTX 260 with 192 processing cores 65nm
or
GeForce GTX 260 216 processing core 55nm
graphics card.
Yes, you can enable SLI using GeForce GTX 260 with 192 processing cores 55 nm and a GeForce GTX 260 with 192 processing cores 65nm graphics card or GeForce GTX 260 processing core 55nm.
These all three graphics cards are compatible in SLI configuration.
For SLI configuration, it is always recommended to use two identical graphics card; the graphics card should be identical in terms of memory and GPU family. Please note that the GeForce GTX 260 must be paired with another GeForce GTX 260, regardless of graphics card manufacturer to enable SLI technology.