Elite Bastards posted a review on the XFX GeForce GTX 280 XXX 1GB video card
A quote from the article:
>> XFX GeForce GTX 280 XXX 1GB video card review
XFX's XXX range of graphics boards always have plenty to offer performance-wise over a reference part, and things are no different on this occasion. Starting out with this board's core clock speed, we see a 68MHz increase to give us an overall speed of 670MHz, while the GT200's shader clocks on this part are bumped to 1458MHz, making for a 162MHz improvements over a reference solution. Finally, the 1GB of GDDR3 memory on the board is blessed with a clock speed of 1250MHz (2500MHz effective) on this XXX part, against 1107MHz on a standard GeForce GTX 280. Some good clock speeds increases to be found on this offering then, and we'll be seeing how that impacts real-world performance later on.
>> XFX GeForce GTX 280 XXX 1GB video card review