fps issues, 2 powerful machines one good, one bad.

[Solgath]

ok so as the topic says, i got 2 systems, one Intel, the other AMD, now my issue is that they are both fairly powerful machines here are the specs for both:

PC-1
AMD FX 6300 6 core cpu 3.50 ghz
[color=#333333]SAPPHIRE HD 7970 GHz Edition 6GB GDDR5 VAPOR-X[/color]

[color=#333333]32gig of Corsair vengence ram[/color]
[color=#333333]Windows 7 pro 64 bit[/color]
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[color=#333333]PC-2[/color]
[color=#333333]Alienware 17[/color]
[color=#333333]Intel Core i7-4900MQ cpu @ 2.80 ghz[/color]
[color=#333333]32gig of ram (not sure the make of said ram)[/color]
[color=#333333]Geforce GTX 780M[/color]
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[color=#333333]comparing the 2, ran the test in hyrule field, pc 1 will drop to 20 fps, where as pc 2 runs flawlessly, both are running in D11, with AA 2 samples and AF 1x, what i'm wondering is, why am i having fps issues with the first machine which is just as powerful as the 2nd?[/color]
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[color=#333333]thanks to anyone who can help out, and if you have any tips i can use to improve performance i would most appreciate it.[/color]