I have my Q9450 OC to 3560 w 8x mult 445 bus speed and 1066 memory running at 1066. Artic freezer 7 pro and 1.35 volts. I have OC the processor to 3.8 with 1.45 volts but when running prime it was getting close to throttling temp and never really noticed a difference with FSX. 3.4 - 3.6 seems to be a sweet spot for OC my processor. DO NO USE more than 1.45 volts on air, if you do you are asking for trouble and generating more heat than added performance anyway. 1.35 -1.4 volts should give you a stable OC at 3.6.
If you don't want to and much heat or volts, I found I could OC to 3.0 with default voltage and 3.2 with only 1.25 volts. Around 3.4 ghz is where the processor starts really sucking the voltage to get added performance. I leave all the thermal and energy features enabled on my processor because it helps save wear and tear on the processor along with electricity and heat generation. There should be no need to disable any of these for an OC of 3.6 or less.
I just upgraded from my 8800gt video card and it really didn't get me much in FSX. I now run a 3890. With my 8800gt I would set my FPS lock to 16 and with my 3890 I set it to 20. I do run with my 3890's quality all maxed out for picture Quality in its software so FSX looks nicer and I also now max out Everything in the Scenery Tab in FSX and also enable light bloom which I couldn't do with my 8800gt. My system still will only get 13 fps around busy airport under certain conditions and I use quite a few CFG tweaks. Here are some of my CFG Tweaks for my card and all of them should be fine with your card except
FIBER_FRAME_TIME_FRACTION=0.15 and Poolsize=200000000. I would set it to .33 and 60000000 with your video card. Set Texture Bandwith Mult to 2 to 4 times what ever your upper frame limit is as a general rule. The lower your upper frame limit is and the faster the video card you have increase the amount you can increase this. It simply regulates how much extra texture data is sent to the video card for it to crunch with the extra processing power left over because you have limited the max number of FPS it has to maintain with the Upper frame limit slider in FSX. ie if the Texture Bandwidth Mult is 2 times the upper frame limit then twice the texture data is sent to video card so it can work on textures ahead of time with its extra processing power. It is important to use the Fiber frame time fraction tweak because it sets the % of time the GPU will spend drawing Frames vs Creating them. My new video card can draw frames real quick vs my 8800gt thus why I can set it to .15 vs the .33 my 8800gt was set at. This means that my new video card spends 85% of its time working on data vs the 8800gt spending 67% of its time working on data. This makes a big difference in how well your video card's processing power is utilized.
I hope some of this may help.
FIBER_FRAME_TIME_FRACTION=0.15
TEXTURE_BANDWIDTH_MULT=80
Poolsize=200000000
UPPER_FRAMERATE_LIMIT=20
TERRAIN_MAX_AUTOGEN_TREES_PER_CELL=1400
TERRAIN_MAX_AUTOGEN_BUILDINGS_PER_CELL=1700
LOD_RADIUS=7.500000
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