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If you're thinking about installing Windows 7 on your current PC, here are some things to think about.

Run Windows 7 Upgrade Advisor to ensure your PC can run Windows 7 or check the basic system requirements.

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P5B motherboard supports the most powerful and energy efficient Intel Core2 processors. It features the Intel P965 chipset and supports DDR2 800MHz dual-channel memory architecture. With exclusive innovative tools AI NOS, AI Gear and AI Nap users can adjust operation speed according to their specific needs. The P5B is a cool and stable platform that delivers extreme performance, minimum noise and maximum power saving.
$155.00

Specs:
CPU - LGA775 socket for Intel Core2 Extreme / Core2 Duo / Pentium Extreme / Pentium D / Pentium 4 / Celeron D Processors
Chipset - Intel P965 / ICH8 with Intel Fast Memory Access Technology
Front Side Bus - 1066 / 800 / 533 MHz
Memory - 4 x DIMM, max. 8GB, DDR2 800 / 667 / 533 MHz-non-ECC, un-buffered memory, Dual channel memory architecture
Expansion Slots - 1 x PCI-E x16 , 3 x PCI-E x1 , 3 x PCI 2.2
Storage
Southbridge - 4 x SATA 3.0 Gb/s ports
JMicron JMB363 PATA and SATA controller
-1 x UltraDMA 133/100/66 for up to 2 PATA devices
-1 x Internal SATA 3.0 Gb/s port , 1 x External SATA 3.0 Gb/s port (SATA On-the-Go)
-Support SATA RAID 0, 1 and JBOD
LAN - Realtek PCI-E Gigabit LAN controller
Audio - ADI 8-channel High Definition Audio CODEC
Support Jack-Sensing, Enumeration, Multi-streaming and Jack-Retasking
Coaxial / Optical S/PDIF out ports at back I/O , ASUS Noise Filter
USB - 10 x USB 2.0 ports (6 ports at mid-board, 4 ports at back panel)
Back Panel I/O Ports
-1 x PS/2 Keyboard , 1 x PS/2 Mouse , 1 x Parallel port
-1 x S/PDIF Out (Coaxial + Optical) , 8-Channel Audio I/O
-1 x RJ45 port , 4 x USB 2.0/1.1 , 1 x External SATA
Internal I/O Connectors
-3 x USB connectors support additional 6 USB ports
-1 x Floppy disk drive connector , 1 x IDE connector
-1 x COM connector , 5 x SATA connectors , Chassis Intrusion connector
-1 x CPU Fan connector , 2 x Chassis Fan connector , 1 x Power Fan connector
-Front panel audio connector , 1 x Azalia Digital Header , 1 x S/PDIF Out Header , CD audio in
-24-pin ATX Power connector , 1 x 4-pin ATX 12V Power connector , System Panel
BIOS - 8 Mb Flash ROM, AMI BIOS, PnP, DMI2.0, WfM2.0, SM BIOS 2.3, ACPI 2.0a, ASUS EZ Flash 2, ASUS CrashFree BIOS 3
Accessories
-UltraDMA 133/100/66 cable , FDD cable , SATA cables , SATA power cables
-I/O Shield , Users manual , USB2.0 port module , 2 in 1 Q-connector
Support CD - Drivers , ASUS PC Probe II , ASUS Update , AI Booster , Anti-virus software (OEM version)
Form Factor - ATX Form Factor, 12x 9.6 inches (30.5cm x 24.5cm)
Windows Vista compatible

MSI Motherboard 945GCM5-F V2
9.7 in.(L) x 8.9 in.(W); micro-ATX2 DIMMs w/ DDR2 533 upto 2GB1 PCI-E 16X; 1 PCI-E 1X; 2 PCI; 8 USB8 Ch. Audio; Gb LAN; SATA2; ATA100Integrated Intel GMA950 graphics controllerLive UpdateWindows Vista Premium compatible.
$75.00

Specs
CPU- Supports Socket 775 for Intel Core 2 Duo, P4 5XX, 6XX, Pentium D 8XX, 9XX and Celeron D processors.
Chipset- Intel 945GC & ICH7
FSB- Support FSB 533/800/1066/1333*MHz
Main Memory
- Supports 2 unbuffered DIMM of 1.8 Volt DDR2 SDRAM
- Supports up to 2GB memory size
- Support Dual Channel DDR2 533/667 MHz and up(*DDR2 Memory Modules are not the same as DDR Memory Module, please check your memory vendor for more information)
Slots- One PCI Express 16X slot for PCI Express x16 graphic card
- One PCI Express 1X slot
- Three PCI 2.2 32-bit Master PCI Bus slots. (support 3.3v/5v PCI bus interface)
On-Board IDE - One Ultra DMA 66/100 IDE controller integrated in ICH7
- Serial ATAII controller integrated in ICH7
On-Board Peripherals - 1 floppy port supports 1 FDD with 360K, 720K, 1.2M, 1.44M and 2.88Mbytes
- 1 Serial port, 1 parallel port supports SPP/EPP/ECP mode
- 8 USB 2.0 ports (Rear x 4/** Front x 4)(** Front USB ports are supported by pin-out)
- 1 6-in-1 audio jack, 2 PS/2 connectors, RJ45 connector
Audio- High Definition link controller integrated in Intel ICH7 chip
- 8 channels audio codec Realtek ALC888 - Compliant with Azalia 1.0 Spec.
LAN- Realtek RTL8111B
- Supports 10/100/1000 Mb/s, Compliane with PCI 2.2, Supports ACPI Power Management.
BIOS- The mainboard BIOS provides "Plug & Play" BIOS which detects the peripheral devices and expansion cards of the board automatically.
- The mainboard provides a Desktop Management Interface(DMI) function which records your mainboard specifications.
Dimensions- 9.7 in (L) x 8.9 in (W); micro-ATX form factor
Mounting- 6 mounting holes