is this Laptop good enough for the best performance while using dolphin?

[spiny blue]

Intel Core i7-620M 2.66 GHz
L2 cache size 4 MB
4 GB DDR3 RAM
ATI Mobility Radeon HD 5650
video memory 1 GB

is this Laptop good enough for the best performance while using dolphin?

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any 1?

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or should i get this ?

processor : Intel i7 820QM Mobile CPU
processor speed : 1.73 GHz
L2 cache size : 6 MB
system memory : 8 GB DDR3 RAM
hard drive capacity : 1 TB
video memory : Dual 1 GB DDR3 RAM
video/graphic chip : ATI MOBILITY RADEON HD4870

i can afford either because both has Installments

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any 1?

also i am a bit worried about video cards.
also does the 8 gb of ram imrpoves the preformence to the first laptop if so can any one tell me how much?
the clock speed on i7-980 laptop processor is a bit low , would is still work ? (the highest frequency is said to be 3.06 Ghz).
does the dual ati in the second laptop imrpoves the preformence?
which laptop of those should i buy?

Thanks.

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Help some one?