Pentium D 945 and 8800gt 512mb

[blitzspecial]

So I have a dell dimensions 5100 right now cause i'm a 16 year old high school student and that's all that's with in my budget. It has a 3.0 ghz P4 in it that i'm going to swap out for a pentium D 945 3.4 ghz. This is the best cpu that this motherboard supports according to all the articles I've looked at. I also currently have a EVGA 8800gt 512mb in my machine and it gets a hugely noticeable bottleneck with the P4. What I really want to know is if with the pentium D 945 3.4 ghz how much performance boost will i see and if it'll be bottlenecking the 8800gt still and if so how noticeable would this bottleneck be.

Thanks and get back to me as soon as possible.

 

[blitzspecial]

Dell Dimensions 5150 not 5100 sorry.

 

[mi1ez]

What games/OS? I would imagine it would make a difference to pretty much all games.

 

[das_stig]

Games will see a small increase in performance if they are only capable of using a single core, those that can use a dual-core might see an even less increase as the D wasn't the best dual-core, so don't spend a lot of cash on it.

 

[blitzspecial]

The pentium d was $13 and i'm running xp home 32bit.

 

[blitzspecial]

So i installed the new cpu and things are slow and when I open my games and what not the cpu fan freaks out i think i'm having power issues as i'm only on a 300 watt psu. Any thoughts.

 

[blitzspecial]

Best answer selected by blitzspecial.