Is nikon d90 compatible with sandisk 32GB Ultra 80mb/s (class 10)?

The specific card is not listed in the tested sd cards but as far as I know these are not the only compatible cards.

If you meant Class 10 SDHC UHS-1, see this.

http://pct1.sandisk.com/ProductList.aspx?DeviceID=2121

I think it should work for the simple reason that it's an SDHC card which is compatible to the D90 according to Nikon (website and manual). If ever the card exceeds the writing and reading speed of the camera, then there's no harm done running it slower.

Another reason is that the link above mentions cards under the Extreme lineup, which is a level higher than Ultra meaning that it's faster. If Sandisk can recommend a faster card to the D90 then surely the slower one will work too.

The manual will not mention that card since it wasn't made yet during the time of printing.