what upgrade should i do to my DELL OPTIFLEX 745 INTEL PENTIUM D...to make it fast.
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  1. Well, you're using socket 775 and you can upgrade your processor to dual-core(Intel Core 2 Quad Q9550, Intel Core 2 Duo E8400) but it won't last long.

    Maybe consider purchasing a new build? Here's some really informative and recommend buy from tomshardware's review.
  2. Hi newcomer and welcome to the Tom's hardware forum.

    The best way to know what CPU u can upgrade is, contact to DELL CHAT SUPPORT using ur service tag and ask it the same.

    I do it for u with a rig that I have in my job, and the max CPU that u can upgrade is the Intel Pentium D series, so, the recommendation of Core 2 quad isn't valid
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