I am trying to build a 1000 system and am currently trying to decide which of the two quad cores to get?
Q6600 vs Q9450
Is the Q9450 worth the 100 premium??
And also will i be able to use a p5k board with a q9450?

The Q9450 in my opinion is worth it with the added cache, plus i overclocked it to 3.6ghz. Lower temps. The Q6600 is still the best bang for the buck. I think you might need a bios update for the P5K. Why don't you get the P5Q, its almost at the same price point.

What kind of memory do you have on that system?? I was thinking if i get a 9450 then i would O.C to 3.2, But what kind of memory will I need? I am currently going for some gigabyte ddr2 800.

ddr2 800 is perfect for a 3.2 on q9450

Q9450 with no doubt is a better CPU, but not exactly leaps ahead of a Q6600. The extra money is just not worth it from a performance/price point of view, but if you can afford it then yes it's better.

Why don't you compare the Q6700 to the Q9450? They are the same clock speed.

outdated q6600 ftw.

If you plan to go over 3.2ghz overclocking, you need higher than ddr2-800, to maintain the 1 to 1 ratio.

What about the Q9300 thats not really that much more is it?

I'm with Joe
outdated q6600 ftw

I have to add, if you play any games, the extra money going to a better gfx card makes it a no brainer.

thats a silly question. look online at benchmarks and decide if its worth a few more dollars for the 9450 .

google is an amazing tool

from what i have read of would go wit the 9450