I write a little how to now, but if you want it to be successful, you absolutely need to STICK to this how-to. Afterwards, if you are not happy with the one or the other setting, you can still change it, but DO NOT try to change some settings while going through my list. Here we go:

 

Delete your FSX.cfg and let FSX build a new one. Open your Sim, set your resolution correctly, be sure that you use 32bit for colours and make sure that all those .dlls are accepted again. Then you exit FSX without doing anything further.

Then, you open the config file with a text editor, and you check if

HIGHMEMFIX=1

is correctly written in the section [GRAPHICS]

Now, you can modify your FFTF value. For this, you add in the section [Main]:

FIBER_FRAME_TIME_FRACTION=0.22

I would start with 0.22, the standard value is 0.33, lower values increase generally your FPS with the risk of blurries... I would never go higher than the standard value of 0.33...

Now, you fire up FSX and you go through the settings. First, set the internal FPS limiter to 33.

Then, I would select in the graphics section:
- Resolution as you want, 32bit.
- trilinear filtering, antialiasing off (we use nVidia Inspector for this later on)
- global texture resolution to max
- no DX10
- lensflare on
- lightbloom off
- advanced animations on

in the aircraft section:
- 3D panel or 2D panel as you want
- no transparency
- no tooltips
- high-resolution 3-D cockpit on
- aircraft casts shadows on the ground off (unless you use only fsx-native AI models or no AI at all)
- aircraft casts shadows on itself off
- aircraft landing-lights illuminate ground on

in the scenery section:
- level of detail radius: large
- mesh complexity: 100
- mesh resolution: 10m
- texture resolution: 7cm
- water effects: low, 2.x
- land detail textures on
- scenery complexity: very dense
- autogen density: normal
- ground scenery shadows: off
- special effects detail: high

in the weather section:
use the pulldown to select "ultra high", then:
- thermal visualization: none
- select detailed clouds and move the slider to "high"
- simulation settings as you wish (depends on whether you use an external weather tool or not)

in the traffic section:
- airline traffic density: as low as possible, depends on your AI traffic tool, if you use none, I would recommend nothing higher than 20%

- general aviation as above...
- airport vehicle density: as low as possible, I have it off, as I mostly fly to and from AES supported airports. For GSX, check their manual.
- aircraft labels at will
- road vehicles: max 5%
- ships and ferries: max 10%
- leisure boats: max 10%

Thats for a beginning. If you encounter low FPS, start reducing autogen and AI traffic first without touching any other settings. Autogen, AI traffic and those vehicles (airport, ships, cars) are FPS killers, you can reduce those settings always a notch without loosing to much image quality and immersion.

 

Now we can fire up nVidia Inspector. Open your FSX profile and change the settings as followed:

 

- Antialiasing behaviour flags: none
- Antialiasing Mode: override any application setting
- Antialiasing Setting: 8xS
- Anisotropic filtering mode: User-defined/Off
- Anisotropic filtering setting: 16x
- Texture filtering - negative LOD BIAS: clamp
- Texture filtering - Quality: Quality
- Multi-Display/mixed-GPU acceleration: single display performance mode
- Power managment mode: prefer maximum performance

and, most importantly:
- Vertical Sync Tear control: standard
- Vertical Sync: 1/2 refresh rate

And that's it. This should give you without touching your 4.4GHz OC on your CPU a nicely fluent and smooth experience with FSX.

 

Just keep in mind (again): if you do not stick to above "manual", nobody can help you. If you think you know it better and instantly put LOD_RADIUS=5.5, textures to 4096 and stuff like that, no one here ore somewhere else (simforums...) will be able to help you.

Hey, I happen to have the same setup as you.

I5 4670k, overclocked to 4.4, 8Gb Ram, GTX 660, Win 7 64 bit. Same.

 

I see from your CFG that you are running DirectX 9.

On my system with a clean install and simply the HighMem fix, FSX + Accel, I get great frame rates and no stutters even with Anti Aliasing turned on.

Adding in WOAI aircraft at 60% and a single payware or freeware airport - still no stutters.

 

I have since switched to DX10, but by system ran very smooth with DX9.

 

What else do you have installed?

 

Your video card should not choke this game unless you are running full AA and have a crapload of Cumulus clouds and a thunderstorm going on.