Mad Moxx has a long tradition of offering pre-modded cards to their customers, starting with the Radeon 9500 NP modded to a 9700 Pro. As you can imagine the manual testing and selection process takes time and costs money. For a premium you get a product that is thoroughly tested to run at the advertised speeds.
In our testing we saw that the Mad-Moxx 7900 GTO 512 MB Burstfire is identical in performance to the GeForce 7900 GTX (within margin of measurement error). During all our testing the card ran perfectly stable at the GTX memory clocks of 800 MHz. It is safe to say that you get a full-fledged GeForce 7900 GTX, just for a lower price. Compared to the much more expensive 7900 GTX, the overclocking possibilities are definitely more limited. In our testing we saw a 7% increase in core and practically no increase in maximum memory clock.
Of course you could argue that you could buy a regular 7900 GTO for a lower price and mod it yourself, who needs a warranty anyway. But not all users are comfortable with doing that, also the GeForce 7900 GTO is out of stock almost anywhere.
As added bonus, Mad Moxx is now including a coupon for three months of free access to the German Pay TV Channel Premiere. If you are from outside Europe, feel free to contact Mad Moxx directly to figure out shipping, usually they will be able to help you.