So what are the differences between the Series 3 docking station/port replicator option?
1. Series 3 Ultrabase
The series 3 ultrabase is used on the X220(i), X220t, X230 and X230t.
Features:
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Serial Ultrabay Slim (9.5 mm) - 6 Gbps/SATAIII
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VGA monitor
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Displayport
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Headphone Jack
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Microphone Jack
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4 x USB 2.0
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Key locking mechanism
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Kensington lock mechanism
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DC power jack
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External ON/OFF switch
2. ThinkPad Mini Port Replicator Series 3 (Product no: 4336-xxx)
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Doesn’t come with power adapter
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Power ON/OFF button
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Kensington lock
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4 USB 2.0 port (new version has one USB 3.0 in place of USB 2.0)
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VGA
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Gigabit Ethernet passthrough (when in use, the laptop’s ethernet port doesn’t work)
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DC power jack
3. ThinkPad Mini Dock Series 3 (Product number: 4337-xxx)
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1 x VGA
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1 x Displayport (displayport is deactivated when DVI port is used)
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Single link DVI-D (even though its a dual link DVI-D)
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Gigabit Ethernet Passthrough (when in use, your laptop’s own gigabit ethernet is disabled)
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6 USB 2.0 (in the updated model with USB 3.0 port, one of the USB port is USB 3.0)
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DC power jack
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90 watts adapter
4. ThinkPad Mini Dock Plus Series 3 (i.e. Workstation model) (Product number: 4338-xxx)
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1 x VGA port
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2 x Displayport
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2 x DVI-D single link (when one DVI port is used, the Displayport next to it is disabled)
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Gigabit Ethernet Passthrough (when in use, your laptop’s own gigabit ethernet is disabled)
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6 USB 2.0
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eSATA (not eSATAp) - new USB 3.0 model has no eSATA port, the eSATA port is replaced with a USB 3.0 port
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DC power jack
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90 watts adapter (Workstation model comes with 135 watts, latest one comes with 170 watts adapter)