Platform and memory Aspire 5680/5630 Series and TravelMate 4280/4230 Series Intel® Centrino® Duo mobile technology, featuring: Intel® CoreTM 2 Duo processor T7200/7400/7600 (4 MB L2 cache, 2.0/2.16/2.33 GHz, 667 MHz FSB) and T5500/5600 (2MB L2 cache, 1.66/1.83 GHz, 667 MHz FSB), supporting Intel® EM64T Intel® 945GM/945PM+ICH7M Intel® PRO/Wireless 3945ABG network connection (dual-band tri-mode 802.11a/b/g) Wi-Fi CERTIFIEDTM solution, supporting Acer SignalUpTM wireless technology (for TravelMate 4280/ 4230) Up to 2 GB of DDR2 533/667 MHz memory, upgradeable to 4 GB using two soDIMM modules (dual-channel support) (for Aspire 5680/5630 and TravelMate 4280/4230) 256/512 MB of DDR2 533 MHz memory, upgradeable to 2 GB using two soDIMM modules (dual- channel support) (for Aspire 3690/TravelMate 2490) Aspire 3690 Series and TravelMate 2490 Series Intel® Celeron® M processor 410/420/430 (1 MB L2 cache, 1.46/1.60/1.73 GHz, 533 MHz FSB) or higher Mobile Intel® 940GML Express chipset Acer InviLinkTM 802.11b/g Wi-Fi CERTIFIEDTM solution, supporting Acer SignalUpTM wireless technology 256/512 MB of DDR2 533 MHz memory, upgradeable to 2 GB using two so DIMM modules (dual- channel support )