It's the .plan update everyone was waiting for, The Carmack's impressions of the Matrox Perhelia-512. Not surprisingly, Carmack is dissapointed with the card's performance and says that none of the special features will be helpful for DOOM 3.

The executive summary is that the Parhelia will run Doom, but it is not performance competitive with Nvidia or ATI. Driver issue remain, so it is not perfect yet, but I am confident that Matrox will resolve them. The performance was really disappointing for the first 256 bit DDR card. I tried to set up a "poster child" case that would stress the memory subsystem above and beyond any driver or triangle level inefficiencies, but I was unable to get it to ever approach the performance of a GF4. ...