Q9300 or Q6700? Which to get

I am contemplating on upgrading to a quad core cpu. Besides gaming I use my computer for 3D modeling (pro/e and some autocad) and ANSYS (FEA) and can get an advantage from multiple cpu's. What I am trying to decide upon is whether to get the Q9300 or the Q6700. I want to OC to 3.0 to 3.2 GHz and am pretty sure both will get there. I have an x48 Asus board with crucial DDR2 ram so I am not really FSB limited. Since both are the same price and stock speed, does anyone know if the extra L2 cache is worth the added power consumption of the 65nm device?

I looked at that one first because of the price but it seemed that 3.2 was about as fast as most people got them to go and had to use voltages at or above 1.4V. At this level the processor might produce more heat than I would like as I enjoy having a very silent system. Although the 65nm die has been in production for awhile now and maybe that voltage has come down with the G0 stepping. Does anyone have experience overclocking a Q6600 to 3.2 GHz with a G0 device and if so what voltages are you using?

It looks as though the Q9300 will hit 3.2GHz at about 1.25V to 1.3V and a Q6700 will require 1.4V. I know my E8400 running at 3.95GHz 1.38V never really gets above 52c or 53c when fully loaded so I suspect the Q9300 would do the same down at 3.2GHz. I've herd of overclocked Q6700's getting up to 65c and beyond. Will probably go with the Q9300 as the extra L2 cache is probably not needed.

The Q6600 has NO problem going above 3.2 with slightly tweaked voltages. I've had mine hit 3.8 but backed down because of the temps. Q6600 is the best bang for the buck at the moment, and unless you really feel you need a 45nm proc right now, go with the Q6600 not the Q6700. There are numerous guide on how to overclock the Q6600 stably, mine only needed to go to 1.325V.

Q6600 3.2GHz 1.4V. I'm pretty happy with it. Didn't try to seriously overclock it. Can run a bunch of stuff with my 8GB of ram and not slow down. All that for $220.

Most G0 Q6600 seem to hit 3.5-3.6 GHz on air. One person here has hit 4GHz on his.

My Q6600 runs daily at 3.0GHz at stock voltage with the retail Intel fan, and in a Quiet and fairly small Antec Sonata II case. I have not hit a wall overclocking it but decided to hold off going higher to keep the load temps under 60 degrees. When I pull the mobo and install a differnt fan, I'll push it higher.

edit: Yesterday Fry's had the retail Q6600 for $200. It was $186 shipped a few weeks back. That's really quite the bargain IMO. Today their price is back to $259, so check Zipzoomfly who seems to be a few bucks cheaper than newegg lately on them.

If you are overclocking to JUST those speeds then get the Q6700 because it will be cheaper. Though if you get the Q9300 you could overclock the hell out of it.