This isn't directly related to RE6, but I might as well post it in this thread. For the heck of it, I did a little test with RE5. On the xbox version, I did a quick mod to increase the limitation of how many enemies can be active at the same time to 40 (which is the same number PC version uses for the No Mercy mode).
I expected the game to crash, but it worked. Framerate suffered like crazy, but it was technically playable. Framerate felt like it was 20 and below.
http://www.abload.de/img/re5-mod-nomercy0042814hqqi.jpg
http://www.abload.de/img/re5-mod-nomercy009332iwo6i.jpg
I did a similar test on PC. Set the enemy limit to 100 and played. And the framerate loss was very small (FPS was between 50 and 60). And this was at 2560x1440.
http://www.abload.de/img/re5dx92013-01-0810-002pzss.jpg
http://www.abload.de/img/re5dx92013-01-0810-00fky8g.jpg
I would very much like that PC version of RE6 now. Being able to play at stupidly high resolution, at a high framerate while getting more freedom with modding is gonna be very nice.