Well.. Think of it this way.. The 8800 cards and the 9800 cards use the same core. The G92 core.
So the performance between them can only be so much, since it's always the same core. It's just minor tweaks to said core and board design that help improve performance.
If you already have an 8800 anything, I wouldn't suggest upgrading to a 9800 anything. If you have the money, wait for the price to drop some more on the GTX 260 or 280.
Or sell your 8800 and buy a 9800+ when it comes out.
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