Reference: ram1009 Comment and Kamen_Bg response. I concur with ram1009 along with a MAJORITY of financial advisors - NO real fanboy there and more adjective evaluation. One of the reasons that amd stock is in the Lew (curently $3.62) and carries a junk status rating from some.
pita82 - "when they benchmark the games, they're using a high-end, quad core i7. . "
That depends on how threaded the Game is. If the game is optimized for multicore (ie 4 or more cores then yes), but many games are still optimized for 1/2 cores. For these games there would be very little diff betweern a i5 and an i7. In some cases the i5 may have a higher frequency than the i7 with more cores. The dif between my i5M and a higher end i7M SB w/HD3000) is the i5 is 4 cores/4 threads vs the i7 with 4 cores and 8 threads - NO increase in HD3000 performance UNLESS the i7 has a higher speed.
OP. If gaming is your only concern then the amd + gpu will give you just as good of performance as the intel + an equivalent dGPU. Overall the Intel CPU + a dGPU is more expensive, but also a better overall performer.
Too often it's all about CPU performance, Most of the AMD and Intel (mid-upper end) are MORE than enough Horsepower. The biggest diff here is in chipsets and drivers and unfornunatly AMD is sucking Hind Ti^%%$ in this department. ie HD chipset / driver look how long it took amd to develop it's own driver for supporting TRIM when using SSDs, while Intel driver provided native support MUCH earilier and already has a driver that supports Trim when SSD is in Raid mode. Another example amd GPU drive support when a dDGP and an Intel iGPU coupled and are used for encoding (check out quick sync) and the ability to switch between dGPU and iGPu when switching between 2D and 3D graphics.
Bottom Line:
If ONLY interest in gaming, go AMD wih the Highest end dGPU at the lowest cost. If interest in productivity apps + gaming go with an Intel i5-3xxxM with the best dGPU you can afford.
PS before IB came out I bout a 17.3" Samsung i5-2410M with a Nvidia 540M dGPU, Bluray ROM/DVDRW drive, 4 gigs ram (cost me $50 -> 8 gigs), 2 HD drive bays (which I latter upgraded to a 128 Gig SSD + a 256 Gig SSD) - Initial cost was $750. Just LOOK for a SALE price.
PSS Either system will play a DVD or Blu-ray equally as well, Internet and email are equal.