You guys forget that at 20-30fps Trinity is already a stuttering mess and a lot of people are ok with gaming like that. I've seen a lot of casual gamers playing on low end computers and loving the experience. So crossfire with a 7750 would probably be just fine for them and the extra 10-15% performance would be welcome. The stuttering wouldn't be noticed by a lot of them. Kids with extreme limited budget are best served by a Trinity. They can pull one off the shelf at their local retailer for a family use PC and start to game on them, taking their allowance or grass mowing money to steam for sales on 1 year old games. Portal, Portal 2, Bioshock, Civ5, Diablo3. These are all games that would run well on a Trinity GPU and are nearly unplayable on a HD2500.
And even Tomshardware who wouldn't get off the dual core bandwagon for a long time has stopped recommending dual core Pentiums to gamers and now use the PhII in extreme budget builds. 4 cores or an i3 with hyperthreading are really recommended nowdays. I wouldn't build any gaming rig with less than 4 cores anymore and that will just get worse with PS4 and xBox Next ports.
I think it's easier to notice the crossfire problems than 15% in this case, also I wouldn't be surprised if in many games it was a lot worse than the result he got on heaven benchmark, if you have a 7750 just disable the IGP.
about the HD2500, obviously the trinity igp is far more useful than that thing for gaming, for me the only real trouble is, if you are not gaming the 2500 is enough, if you are gaming, buying a cheap card like a 7770 makes a lot of sense.... but as I said, I think it can be a good solution combined with other cheap components,
when comparing trinity to discrete graphics is good to consider the entire price, not just CPU vs CPU+VGA, if you use a 7770 you don't really need fast memory, you can get a cheaper CPU (like 750k-5600K instead of 5800K) and so on...
Just for fun,
AMD Llano 3870K Crysis 3 Low 720p on Samsung 47" 1080p TV.
Power consumption playing Crysis 3 was 115W on the wall.
interesting, but it's clear that even at the lowest possible settings in 720P you are easily under 30fps,
also is it overclocked (700MHz? it should be 600)?
and I think this is not the most demanding part of the game for the GPU, so things can get ugly... some used 5770 would really transform that PC,
looking at the tomshardware graphic, and comparing the 6670 DDR3 to the 630 DDR5 I have the impression that this game is seriously limited by memory bandwidth at low settings.