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As Inayath has noted, the 3750G cannot be upgraded to support 10g. (The was one model of that series that did support a single 10g port.)
If you want to support 10g, you'll need to look at newer devices. Some of the newer devices have 10g ports standard, some as optional modules. Usually 10g ports will require a external module, but there are some that will support just 10g copper. Also, some of the new ports might be SFP+, which can support 1g or 10g.
