I'm running a Q6600 @ stock speed, 4GB of DDR2800 memory, and a 9800GTX @ stock speeds.

After an hour and a half of Crysis my GPU was at 73C, CPU was at 45C and the system temp was around 40C.

My case is a Coolermaster Wavemaster with two 90mm intake fans on the front, and two 90mm exhaust fans, one on the top and one in the back.

Core 2 Quad and Duo Temperature Guide: http://www.tomshardware.com/forum/ [...] ture-guide

What program do you use to see all the temps in your computer? I have nTune but it only shows graphics card temps.

To get my cpu and system temps I rebooted immediately after I was done playing and checked them in the BIOS.

Those temps seem fine to me

I agree, those temps are fine.

Make that three. Plus it's summer so temps are slightly higher than they would be in the cooler months.

CPU looks fine. The GPU tempsis a fair amount higher than what I see with my 9800 GTXs for Age of Conan (high settings play - I'm around 60 celsius)), but looks like others think you are fine so perhaps I just have good cooling in my case.

To check your temps get Real Temp 2.60 for CPU and HWMonitor for GPU
Run both and minimize to task bar
After playing check your temps in these program
You'll find the Max. temps recorded
75 is high
Get Riva Tuner and increase the speed of graphic card to 70% or more if required
Mostly the fan speed will be set at 30%

CPU temps look OK.

My Q6600 (VID = 1.2625 v) with TRUE in Antec 900 case loaded with Prime95, core temps monitored with CoreTemp (need to get a copy of Real Temp):
At 3.3 GHz - 1.300 v vcore, temps are around 55 C.
At 3.6 GHz - 1.45 v vcore, droop to 1.400 v, temps are aroung 65 C.