The Radeon HD 3300 is a modest improvement over the HD 3200 and it ships with a few new features such as Advanced Clock Calibration. The 790GX is also compatible with AMD's new SB750 Southbridge.
We should have benchmarks of the Radeon HD 3300 under Linux shortly, but for now we just wanted to share that this IGP should work with the Catalyst 8.7 Linux driver, which was released last month. What still isn't supported, however, is their Hybrid Graphics Technology on Linux. Additionally, it should also work with the xf86-video-ati and xf86-video-radeonhd open-source drivers once adding in the new PCI ID.
More on the Radeon HD 3300 / 790GX can be found in the AMD press release.