CPU
2nd Generation Intel Sandy Bridge Dual Core i3-2310M/2330M/2350M/2370M/2382M or i5-2410/2430M/2450M/2520M/2540M or i7-2620M/2640M or Quad Core i7-2630QM/2670QM/2720QM/2760QM/2820QM/2860QM/2920XM Processor
Memory Type
PC3-10660 1333MHz DDR3 204pin SO-DIMM Laptop Memory
Standard Memory
up to 16GB with dual core processor or up to 32GB with quad core processor
Max Memory
up to 16GB with dual core processor or up to 32GB with quad core processor
Memory Expansion Slots
2 SO-DIMM slots in models with dual core processor or 4 SO-DIMM slots in models with quad core processor
PC Card Slots
One ExpressCard/34 Slot
USB Ports
Two USB v3.0 Type-A Ports and Two USB v2.0 Type-A Ports (One USB v2.0 only Port and One USB v2.0/eSATA Combo Port)
Firewire Ports
One 4-pin IEEE-1394 Firewire / I.Link Port
Card Reader
4-in-1 Integrated SD Card Reader Slot: (SD/SDHC/SDXC/MMC)
Original Optical Drives
Removable DVD Burner Dual Layer Drive or Blu-Ray DVD Combo Drive
Original Hard Drives
160GB, 250GB, 320GB, 500GB 5400RPM or 7200RPM SATA II 3Gb/s Hard Drive
Original Solid State Drives
128GB, 180GB, 240GB, 256GB, 300GB 2.5" SATA III 6Gb/s Solid State Drive or 80GB mSATA Solid State Drive
Drive Notes
The Lenovo ThinkPad W520 Laptop Supports up to 3 Drives. (One 2.5" Solid State Drive or Hard Drive in the Primary Bay and/or One mSATA Solid State Drive and One 2.5" Solid State Drive or Hard Drive in the Optical Bay) Note: The second 2.5" Drive replaces the optical drive when installed. If installing the second 2.5" Drive in replace of the optical drive, you will need the 2nd HDD ultrabay enhanced media bay tray p/n 43N3429 for installation.