AMD Radeon HD 7970 still not accelerated in 10.7.3 but usable on Hackintosh

The new ATI Graphics Cards from the 7970 series are super-fast, while being single GPU systems (the upcoming 7990 will be a dual-GPU 6GB Graphics Card). Besides being quite "cheap" (around 500€ in Europe, $589 in the US, they are said to be supported in OSX soon (see also a discovery by netkas) - until then, there is a current way how to use them (although not accelerated) with chimera. Props go to Shrapnl from the tonymac86 forum:

I was able to force my 7970 into a higher res (still unaccelerated of course) via the org.chameleon.boot.plist with the following:

<key>Graphics Mode</key>
<string>2560x1440x32</string></pre>

Of course, you can overclock the 7900 Series just fine. There are "Waterblocks" from Aquacomputer for the 7900 series, as outlined by Geeks3D.

Of course, the GPU runs quite fast without overclocking, still you could go faster. Below: Shamino has overclocked a Radeon HD 7970 under LN2 with the following clock speeds: 1650MHz for the GPU and 1800MHz real speed (7200MHz effective) for the memory. (Source: geeks3d)

[Update] the best way to cool your AMD Radeon 7970 is the Arctic Cooling Accelero Xtreme 7970 which will cool down your GPU for additional 10degrees celsius (at least). Overclocking, here we go!