Which Processor?

[Sporego]

I am getting a Alienware Laptop M15x and i am stuck choosing a processor.

Between
Intel® Core™ i7-620M 2.66GHz (3.33Ghz Turbo Mode, 4M cache)

or

Intel® Core™ i7-720QM Quad Core Processor 1.6GHz (2.8GHz Turbo Mode, 6MB Cache)

Use-I am using this computer for gaming mostly just don't know what cache does.(I do ,but not familiar)

Specs-

Genuine Windows® 7 Home Premium, 64bit, English
(Processor here)-stuck
1GB ATI Radeonâ„¢ Mobility HD 5850
15.6-inch WideFHD 1920x1080 (1080p) WLED
8GB Dual Channel DDR3 at 1333MHz – 2 x 4096MB
250GB SATAII 7,200RPM
Slot-Load Dual Layer DVD Burner (DVD+-RW, CD-RW)
Primary - 9-cell (85Watt) Lithium-Ion Battery
Intel WiFi Link 5300 802.11AGN Half Mini Card

 

[foothead]

620M for sure.

 

[Sporego]

620m for GHz right? What does cache do?

 

[foothead]

http://en.wikipedia.org/wiki/CPU_cache

the extra 2M cache does not make a huge difference.

 

[Sporego]

How about quad core?

 

[foothead]

Both are quad core with hyperthreading.

 

[GibsonSGKing]

How about quad core?

All core i7 processors are quad cores.

 

[Sporego]

TY one last question what does 620m and 720qm mean does that degrade performance or any thing because the number is lower?

 

[foothead]

No.

 

[Sporego]

Hey i just noticed is i use 620 m i can only use
1066Mhz Memory
But if i use 720qm i get
1333Mhz Memory
so it it worth it ?

Ram i am using 8 gb

8GB Dual Channel DDR3 at 1066MHz

8GB Dual Channel DDR3 at 1333MHz – 2 x 4096MB