TweakTown posted a review on the XFX GeForce 7950GT Extreme video card

While at first due to the naming scheme you might think that the card is a dual core solution, much like the GeForce 7950GX2, it certainly is not that. It is designed to sit above the older GeForce 7900GT as far as performance goes (which of course means it’s faster then the new 7900GS that was released only last week) and as far as pricing goes, it’s going up directly against ATI’s new Radeon X1900XT 256MB. It comes with 512MB worth of fast GDDR-3 compared to just 256MB on the 7900GT and has its core and memory clock speeds have increased quite a healthy margin.

XFX GeForce 7950GT Extreme Review