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RE: Dell 1558 needs upgrade...

The use first-generation Core i CPUs - - yes, you can move to an i5, but if you have integrated video, you can't use any i7 quad cores (the quad core i7s have no video circuit onboard so they cannot be used on a system without a discrete GPU).

These were shipped with the i5-430m -- that one will work, but don't expect miracles - if it's still running a conventional hard drive, upgrading to a solid state drive will produce much more marked results than a CPU upgrade.

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