We're sorry - not trying to make you feel bad.
Apparently the Salesman played a bait-and-switch <or> was lazy/dumb and gave you the WRONG box; example the i7 940XM is a 4-core / 8-thread CPU. SUGGESTION: Return it! - And make some hell!!!
i7-940XM
http://ark.intel.com/Product.aspx?id=43127
The Alienware M15x Laptop
http://www.dell.com/us/p/alienware-m15x/pd?refid=alienware-m15x&~ck=mn
options:
4-cores:
Intel® CoreTM i7 940XM (2.13GHz/8MB cache)
Intel® CoreTM i7 840QM (1.86GHz/6MB cache)
Intel® CoreTM i7 740QM (1.73GHz/6MB cache)
2-cores:
Intel® CoreTM i5 540M (2.53GHz/3MB cache)
Intel® CoreTM i3 350M (2.26GHz/3MB cache)
The Alienware M17x Laptop
http://www.dell.com/us/p/alienware-m17x/pd?refid=laptop-alienware-m17x&~ck=mn
options:
4-cores:
Intel® CoreTM i7 940XM (2.13GHz/8MB cache)
Intel® CoreTM i7 840QM (1.86GHz/6MB cache)
Intel® CoreTM i7 740QM (1.73GHz/6MB cache)
Intel® CoreTM i7 720QM (1.6GHz/6MB cache)
2-cores:
Intel® CoreTM i5 540M (2.53GHz/3MB cache)
Intel® CoreTM i5 520M (2.4GHz/3MB cache)