Acer Aspire AS5734Z comes with these spec:
Operating System
Genuine Windows(R) 7 Home Premium
Processor
Intel(R) Pentium(R) Processor T4500 (1MB L2 cache, 2.3GHz, 800 FSB)
Chipset
Mobile Intel(R) GL40 Express

Acer Aspire AS5741Z comes with these spec:
Operating System
Genuine Windows(R) 7 Home Premium
Processor
Intel(R) Core™ i5-430M Processor (3MB L2 cache, 2.26GHz)

Acer Aspire AS5745PG comes with these spec:
Operating System
Genuine Windows(R) 7 Home Premium
Processor
Intel(R) Core™ i7-720QM Mobile Processor (6MB Intel(R) Smart Cache, 1.6GHz) or
Intel(R) Core™ i5-450M Mobile Processor (3MB Intel(R) Smart Cache, 2.4GHz) or
Intel(R) Core™ i3-350M Mobile Processor (3MB Intel(R) Smart Cache, 2.26GHz)

Acer Aspire AS7551G comes with these spec:
Operating System
Genuine Windows(R) 7 Home Premium
Processor
AMD Phenom™ II Quad-Core Mobile Processor N930 (2MB L2 cache, 2.0GHz) or
AMD Phenom™ II Triple-Core Mobile Processor N830 (1.5MB L2 cache, 2.10GHz) or
AMD Turion™ II Dual-Core Mobile Processor P520 (2MB L2 cache, 2.30GHz) or
AMD Athlon™ II Dual-Core Processor P320 (1MB L2 cache, 2.10GHz)

Acer Aspire TimelineX AS5820T comes with these spec:
Operating System
Genuine Windows(R) 7 Home Premium
Processor
Intel(R) Core™ i5-450M Mobile Processor (3MB Intel(R) Smart Cache, 2.4GHz) or
Intel(R) Core™ i3-350M Mobile Processor (3MB Intel(R) Smart Cache, 2.26GHz)