hi all i need help on a upgrade for my old dell

[michael the poor]

hi all my pc can be upgraded to a Intel Pentium D Processor.
i will list my specs also some processors i think will work with my bored .
also do people buy new heat sink when they upgrade a processor .or some times you can get a away with not buying one.also can my bios handle these chips.also plz dont ask me to get a new pc because some chips are only 30pound thats my weekly money also any chance there would be a boost on shogun with a new chip over pentuim 4
specs

MIKE-80EADD7B8A
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_rtm.040803-2158)
Language: English (Regional Setting: English)
System Manufacturer: Dell Inc.
System Model: Dimension XPSGEN5
BIOS: Phoenix ROM BIOS PLUS Version 1.10 A04
Processor: Intel(R) Pentium(R) 4 CPU 3.20GHz (2 CPUs)
Memory: 2046MB RAM
Page File: 435MB used, 3502MB available
450w power supply or 460



Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.2180 32bit Unicode

my mobo
0GC068
intel i955x
socket 775 lga

also heres a list on a form i found saying what cards i think will work
Intel® Desktop Board D955XCS — Supported Processors

 

[brinks]

You can reuse your old heat sink, just make sure to reapply new thermal paste. You will probably see very little improvement to your shogun game with an cpu upgrade.

I don't really know too much on Dell motherboards and their bios so can't give you a clear answer on what it can cpu it supports.