What's the realistic performance difference?

About 50-75% (75% with the 7970m, 50% with the 6970m as an example) GPU performance wise (with an AMD or Nvidia card not the CPU GPU which is a lot lower performance) and cpus in laptops are pretty good some are close to desktop cpus and some are only like 10-15% slower.

The above example I give is for a highend gaming laptops with a single GPU and the desktop again would be a highend with a single GPU.


Highend laptops now make great desktop replacements and just as fast if you get them with dual GPUs. You can look at a lot of laptops now and see they are much faster than only last years highend desktops in some cases. If you don't have a need for a desktop or the space they are great devices now.
 
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About 50-75% (75% with the 7970m, 50% with the 6970m as an example) GPU performance wise (with an AMD or Nvidia card not the CPU GPU which is a lot lower performance) and cpus in laptops are pretty good some are close to desktop cpus and some are only like 10-15% slower.

The above example I give is for a highend gaming laptops with a single GPU and the desktop again would be a highend with a single GPU.


Highend laptops now make great desktop replacements and just as fast if you get them with dual GPUs. You can look at a lot of laptops now and see they are much faster than only last years highend desktops in some cases. If you don't have a need for a desktop or the space they are great devices now.

I agree on the desktop replacement point, with added bonus of being able to move it around easlily.
 
The only issue comes, in my opinion, when you want to have a really good graphics card in it. Without that, they're not bad, and a few upgrades (RAM, HDD) can be done for much cheaper than actual laptop builders/distributers.

Another issue is heat, easily solved with a cooling pad or something. It all depends on how mobile you really are.
 
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