The Sony VAIO TX850p is recently introduced in the market in late summer 2006, until Sony released the TXN series coincided with the release of Microsoft Windows Vista. Having seen and used a TXN25, I can say that currently, the only difference between the TX and TXN series is that the latter comes with Windows Vista Business and has a slightly faster processor (a Core Solo ULV U1500 at 1, 33 GHz).
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Sony VAIO TX850p specifications:
• Intel Core Solo processor Ultra Low Voltage (ULV) U1400 (1.2GHz, 2 MB L2 cache, 533 MHz FSB)
• 1GB DDR2 RAM (expandable to 1.5)
• 80GB 4200-RPM hard drive
• Built-in DVD+/-R burner
• Intel GMA 950 integrated display adapter, supported by the Intel 945G Express Chipset
• 11.1" WXGA Display (1366x768 resolution) with XBrite Technology
• Microsoft Windows XP Professional w/ SP2
• Intel PRO/Wireless 3945 A/B/G Wireless LAN
• Integrated Bluetooth
• Fingerprint Reader
• PCMCIA slot
• Memory Stick/SD Memory Card slot
• 2 USB ports/D-Sub VGA out/Port Replicator/Microphone/Headphone
• Dial-up modem/FireWire/Ethernet
• Instant ON DVD/Music player