What?! Are there any benchmarks to support this? I would say that the real difference would be 10-20% at most.
Go to
www.notebookcheck.com and go to their benchmark pages. Select the first 8-9 games, then select the 6750M and also the 5730M and hit your enter key. It will display a page where you can compare the frames per second that each card gets under their settings. IIRC, High = High in all tests, just like Ultra = Ultra, down to the same resolution and settings. So it is an apples and apples comparison, with the exception of the potential CPU limitation. But when comparing the high and ultra high settings, the CPU limitation is pretty non non-existant due to the 1920
x1080+ resolution used. Anyway, you can see that the 6750M is decently faster than the 5730M.
Keep in mind that the 6770M is even faster (clocked 21% higher). Also keep in mind that this is basically 1/2 barts (6700M Series) versus 1/2 juniper (5600/5700 series).
Edit ** Decided to do the work for you
The 6770M is clocked at 725/800 GDDR5. The 5730 is clocked at 650Mhz/800 GDDR3. So, technically, the performance difference will be greater than what we see below... Mafia II has some odd results, not sure why. I think ultra turns on some Physx type calculations and brings anything without an nVidia card to its knees.
(6750M) 600/900 GDDR5 - Versus (6650M) 600/800 GDDR3
32 versus 23 BOPS 39% faster
70 versus 47 FIFA 49% faster
23 versus 20 Mafia II 15% faster
24 versus 16 SC2 50% faster
20 versus 15 BC2 33% faster
22 versus 17 Risen 29% faster
35 versus 27 RE5 30% faster
21 versus 16 Dirt 2 31% faster
Overall 34.5%
Source:
www.notebookcheck.com
Note: So far (to my knowledge) there has not been a 5600/5700 series joined with GDDR5. So with the 6570M, the performance is unknown. It is basically a 5730M paired with GDDR5. But since no one has it yet, it is impossible to determine how much faster the 6770M will be than the 6570M. But we do know that the 6770M is significantly faster than the 5730M and 6550M and any variant of the 5650M. Hope this helps...