9800GTX review from Toms hardware, and it is out on newegg

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Nvidia GeForce 9800 GTX Review | Tom's Hardware

It seems that 9800GTX performs almost as good as 8800Ultra

Also, 9800GTX have better overclocking potential than 8800GTS 512MB. So, I don't think that GTX and GTS 512 are exactly the same thing

9800GTX is now available at newegg.
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This is the conclusion from the Toms Hardware

The end result is that Nvidia has taken care of business with this GeForce 9800 GTX. It delivers very good performance, better than the 8800 GTX' (by an average of 7%) and close to the 8800 Ultra (especially without antialiasing). The performance is also good enough to put the 8800 GTS 512 MB out of the running, with a little surprise: Despite an identical GPU and similar throughputs (+4% in the raw-processing-power department, +13% for memory bandwidth), the gain in actual gaming is sometimes as much as 40% (average 13%). That's because the GeForce 8 drivers were older at the time of our test, and will catch up when Nvidia finally gets around to updating them (a beta version of ForceWare 174.74 has just been released).

To put the icing on the cake, the price of this 9800 GTX is relatively low - $300-350, less than the HD 3870 X2. Its price, in fact, is lower than most of the other cards we tested here except for the 8800 GT, HD 3870 and 8800 GTS 512 MB. The addition of HybridPower support is also promising, even though we won't get the benefit of it right away.