Acer Aspire TimelineX AS4820T 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)

Acer Aspire TimelineX AS1830T comes with these spec:
Operating System
Genuine Windows(R) 7 Home Premium
Processor
Intel(R) Core™ i5-430UM Mobile Processor (3MB Intel(R) Smart Cache, 1.2GHz) with
Intel(R) Turbo Boost Technology
Intel(R) Hyper-Threading Technology
Enhanced Intel SpeedStep(R) Technology or
Intel(R) Core™ i3-330UM Mobile Processor (3MB Intel(R) Smart Cache, 1.2GHz) with
Intel(R) Hyper-Threading Technology
Enhanced Intel SpeedStep(R) Technology

Acer Aspire TimelineX AS4820T 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)

Acer Aspire TimelineX AS3820T 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)

Acer Aspire AS1551 comes with these spec:
Operating System
Genuine Windows(R) 7 Home Premium
Processor
AMD Turion™ II Neo Dual-Core Mobile Processor K625 (2MB L2 cache, 1.50GHz) or
AMD Athlon™ II Neo Dual-Core Processor K325 (2MB L2 cache, 1.30GHz)