Want to upgrade CPU From 2.80 ghz intel (R) pentium(R) D to above

My PC specs
intel(r) pentium(r) D CPU 2.80ghz 2.80 ghz // (2M)
but I wanted to upgrade CPU and I do so.
I upgraded to 3.40ghz 3.40ghz (4M) but the speed is the same or the I think slow than before :/
Why is this so? And what should I do? Should I replace this to 2.80ghz again or not?
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More about upgrade cpu ghz intel pentium
  1. CPU models? motherboard? power supply? it might help
  2. Elysian890 said:
    CPU models? motherboard? power supply? it might help


    Motherboard:
    Manufacturer Product SerialNumber Version
    Dell Inc. 0H086H ..CN4294089P03XY. A00

    Processor:
    Intel(R) Pentium(R) D CPU 2.80GHz 2.80 GHz


    Operating System
    Windows 7 Ultimate 64-bit SP1
    CPU
    Intel Pentium D 945
    Presler 65nm Technology
    RAM
    4.00GB Dual-Channel DDR2 @ 399MHz (6-6-6-18)
    Motherboard
    Dell Inc. 0H086H (Socket 775) 99 °C
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