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details at
Dell.com

• Processor: Intel® Core™ i5 2500 (3.3GHz, 6M)  
• Operating Systems: Genuine Windows Vista® Home Basic Service Pack 2 with Media 32-bit, English Installed
• Memory: 4GB DDR3 Non-ECC, SDRAM,133MHz Dual Channel, 2x2GB
• Video Card: 512MB AMD RADEON HD 6350 (2 DVI), low profile
• Monitor: Dell Professional P190S 19 in HAS,VGA/DVI
• Keyboard: Dell USB Entry keyboard, English
• Mouse: Dell MS111 USB Optical Mouse
• Hard Drive: 250GB 2.5 SATA with 16MB DataBurst Cashe™
• CD ROM/DVD ROM: 16X DVD+/-RW SATA, Roxio Creator™ CyberlinkPowerDVD™ (Royalty)
• Systems Management Mode: Intel Standard Manageability
• Speakers: None
• Hardware Support Services: 3 Year Basic Hardware Service with 3 year NBD Onsite Service after remote diagnosis.

VPATs

• Optiplex 990

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details at
Apple.com

• All-in-one design: iMac packs all its components--from the processor to the iSight camera--into an astoundingly thin, anodized aluminum frame.
• Processor: 2.7GHz Quad-core Intel Core i5 with 6MB on-chip shared L3 cache 
• Operating Systems: MacOS X Snow Leopard;
• Software included: Mac OS X v10.5 Leopard (includes iTunes, Time Machine, Quick Look, Spaces, Spotlight, Dashboard, Mail, iChat, Safari, Address Book, QuickTime, iCal, DVD Player, Photo Booth, Front Row, Xcode Developer Tools); iLife (includes iPhoto, iMovie, iWeb, GarageBand)
• Memory: 4GB 1333MHz DDR3
• Hard Drive: 1TB (7200 rpm) 
• CD ROM/DVD ROM: 8x SuperDrive with 4x double layer burning
• Mouse: Magic Mouse
• Keyboard: Apple Wireless Keyboard
• Display: Apple 21.5-inch glossy widescreen display.
• Video Card: AMD Radeon HD 6770M graphics
• Speakers: Built-in stereo speakers
• Warranty: Every Mac comes with complimentary telephone technical support within 90 days of your Mac purchase and a one-year limited warranty.