Ok, if cost were not an issue what would be the best cpu for an alienware laptop in the i7 series and why is it better then the rest. im spending lot of money and i want some facts on why to get the processor im getting. i hear the 920xm is better then the 820qm. and i also hear the 620 is all i relly need for just gaming. Help me !!
Spending $1,000 on a CPU that will be like a $200 desktop CPU is silly IMO (unless cost isn't a factor).
As you can see, OP. The 9xxXM has 8MB L3 cache (compared to 6MB on the 8xx/7xx), and a 133MHz advantage over its predecessor. Mind you, desktop CPUs still only have 6MB L3, so it could say 8MB for such low clocked CPUs is overkill, IMO... They (9xxXM) also have a 10w higher TDP.
If it was me, I'd go for nothing more than an i7 840QM. And TBH I'd probably go as low as a 740QM, or even go for the 4MB L3 i7/i5.