Processor Upgrade

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My current processor is a Pentium 4 3GHz. I have decided to upgrade to a (Intel) dual core, with my current motherboard (Asus P5LD2-VM DH) will this be OK? According to the specs it is socket 775 which supports Intel Dual Core. I am looking at this processor and this fan/heatsink. Are they a good choice or are there better alternatives, that don't exceed the total price here?
 
What about this one? It's cheaper and as far as I can tell the only difference is the cache is only 2mb as opposed to 3mb. Will this make a significant difference?
 
Arse, according to that list the processor in my previous post and the one in the first are incompatible.

EDIT: The pricing scheme for these processors is really confusing me, all the processors below the ones I found are more expensive. Should I just buy a new motherboard?
 
Why is 3 GHz not good enough for you ? I have an Intel Dual Core at 2.3/4 GHz, and I'm wishing I had MORE ...
 
As far as I am aware there is a fair difference between a single and double core in terms of performance, even when the clock speed of the double core is lower. As for actually upgrading, I need to buy a new cooler as my current CPU is overheating to the point of the computer resetting, I've cleaned the fan and heatsink out and it's still a problem. As I was buying a new cooler I may as well get a better CPU.
 
The reason the older and slower CPUs sometimes cost more is that they're no longer manufactured, I would imagine, and thus harder to come by.

If you get a new motherboard, besides a new CPU, you might need to get new memory and possibly a new video card (only if you're using the onboard video though, since I see your current one has PCI Express).
Your old memory would work in a newish motherboard which accepts DDR2, but it would be slowing things down. You should be able to get quality paired 2 GB memory sticks (total 4 GB) for around $50.

Also, I wouldn't bother getting a separate HSF unless you really plan to overclock the hell out of the CPU. Stock HSF units these days tend to actually be pretty good. As janulhannes alluded to, it's more important to make sure your case has decent airflow. Primarily, a fan towards the front bottom of the case pulling cool air in (across your hard drives if possible) and one in the back expelling hot air from around where the CPU is.
 
With a new motherboard the memory won't be an issue as I was probably going to get some new. The video card (Ati HD 3850) will be compatible. However given the current situation I won't be able to afford all of the new components just yet. I'll buy the fan now, set that up, hopefully the CPU will be cool enough to run. I'll get all my money I can spare together then I'll consider buy more stuff in the future.
 
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