Some MBP unibody owners have experienced problems with video when switching to the GeForce 9600. Apple knows about this issue, but did not communicate about it, as still looking for a complete investigation.
In addition to this news about video artifacts, another information is again affecting NVidia’s image. Officially, the new chips are using a new manufacturing process in order to avoid the defective production series faced by NVidia with the previous 8x00 GPU (well known by owners of the MBP whose video is powered by the GF 8600)
In order to check NVidia’s claims concerning this new manufacturing process,
The Inquirer decided to purchase a new MacBook Pro unibody and to submit it to deep analysis in laboratories.

Results are surprising, and maybe not so good for us Mac users. The GF 9400M chipset is indeed manufactured with a new process, however the GF 9600 is produced with a material very similar for not saying identical to the defective one known to be responsible of the massive 8x00 GPU defect.
Facing such results, NVidia indicated that while the some GF 9600 might have a material very similar to the defective one in their manufacturing process, it would not lead to the same disaster issue known for the 8x00 series, and this material is also used in millions of GPU. If it would then be the case, why would then NVidia change this material for manufacturing the 9400M chipset?
So far, none of NVidia’s explanations or claims has convinced customers associations as well as IT websites or OEM, it will need time till we finally get a true piece of information, if it ever comes. In addition, at the end of the article, The Inquirer is simply recommending not to buy a MacBook Pro, simply based on unclear situation regarding the way the GF 9600 is manufactured.
Back, to the video artifact mentioned at the beginning of the article, it might well be due to an overloaded cooling system, as in the new unibody MBP, the CPU and the GPU share the same heatsink. As we have shown it already, the dual core CPU can heat till 100-105°C, if you add in addition a fully loaded GPU, you might end-up to the limit of the cooling system, leading to video artifacts.