Dell Gx620 - worth Overclocking

Soldato
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I've recently scrounged an optiplex gx620 with a half decent spec..
Pentium D 830(3Ghz), 3Gb of 533mhz DDR2 and I've bought an 8800gt to run on this and have my first ever gaming machine :-)
Now like everyone one else, my fps for Crysis is not as much as Id like which made me think about OCing this box. Problem is, its a Dell, custom PSU, not sure the bios gives me any options, and I have not got a clue who makes the motherboard, so do not even know if I can overclock my RAM, but hell, this could be fun.
Im asking the more experienced OC'ers out there - is it worth trying to OC this box, how much headroom is there, as I know these CPU's run hot? Dell builds are custom and for business, so will that limit me? I am aware that any improvements are liable to be small, as it is old tech and bus speeds have moved on etc etc
If I can play around without spending too much, I will, otherwise am I better off flogging the box and using the cash to get new parts towards an AMD spider or Intel quad rig?
At best I am only looking at this to tide me over for a year or so until I can build something else - now I have a gaming rig - there is no going back!!!

Thought I'd throw it out to the community and see what the feedback was, I can imagine a few techies out there shaking their heads...

I await with interest

Many Thanks
 
RAM??

Right, done a bit more research...
With DDR2, can I use any speed RAM, as I can see there are several speeds, or am I stuck at 533Mhz?
Is it a physical limitation of the MB, or is it just a BIOS setting?

Cheers
 
you ain't gonna OC your memory or cpu I'm afraid, dell motherboards don't give you the option and you can't use things like clockgen because they can't access the dell bios either (I expect its just the fact that the dell bios flat doesn't have any OC options).

You could OC the 8800 using rivatuner etc but as for the cpu, its staying put I'm afraid.
 
Maybe just save up and grab a new motherboard/case and maybe PSU for it.

You can then transfer your bits across and overclock.
 
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