ThinkCentre M91/M91p, Core i7-2600 (3.4 GHz) Processor, 4GB (1 DIMM) RAM, 500GB / 7200RPM Hard Drive, DVD RW Optical Drive, Intel HD (VGA + DP) Video Outputs, Win 7 Pro 64, ENERGY STAR 5.0
ThinkCentre M91/M91p, Core i5-2500 (3.3 GHz) Processor, 4GB (1 DIMM) RAM, 500GB / 7200RPM Hard Drive, DVD RW Optical Drive, Intel HD (VGA + DP) Video Outputs, Win 7 Pro 64, ENERGY STAR 5.0
ThinkCentre M91/M91p, Core i5-2500 (3.3 GHz) Processor, 4GB (1 DIMM) RAM, 500GB / 7200RPM Hard Drive, DVD RW Optical Drive, Intel HD (VGA + DP) Video Outputs, Win 7 Pro 32, ENERGY STAR 5.0
ThinkCentre M91/M91p, Core i7-2600 (3.4 GHz) Processor, 4GB (1 DIMM) RAM, 500GB / 7200RPM Hard Drive, DVD RW Optical Drive, Intel HD (VGA + DP) Video Outputs, Win 7 Pro 32, ENERGY STAR 5.0
ThinkCentre M91/M91p, Core i5-2400 (3.1 GHz) Processor, 4GB (1 DIMM) RAM, 250GB / 7200RPM Hard Drive, DVD RW Optical Drive, Intel HD (VGA + DP) Video Outputs, Win 7 Pro 64, ENERGY STAR 5.0
ThinkCentre M91/M91p, Core i5-2500 (3.3 GHz) Processor, 4GB (1 DIMM) RAM, 250GB / 7200RPM Hard Drive, DVD RW Optical Drive, Intel HD (VGA + DP) Video Outputs, Win 7 Pro 64, ENERGY STAR 5.0