Help me with the **** Stuttering!! please!!

You using a widescreen LCD for your display? If possible, you may need to disable LCD overdrive in your drivers control panel. Otherwise the system is fairly sound, depending on what res you're running at the 8600gt may be holding you back.

This has happened to me with my 8800GT in some games.

I solved by setting the "Maximum pre-rendered frames" in the Nvidia control panel to 1 instead of the default 3, and turning on triple buffering (even though the games this happened in were not OpenGL).

Try it and see if it solves your problem.

After trying the suggestions others have posted, my 2 cents is that if you want to game, you really need a better GPU. An 8600GT is a very low end gaming card.....any gaming enthusiast would not even consider it an option.
An 8800GT is what I would call a minimum GPU for decent gaming performance these days.

When i bought the 8600GT, my options were: Ati x1950pro for 120€, 8800GTS 320MB for 270€, and 8600GT, 2600xt, 7900GS all for 99€.

7900gs no shaders, 2600xt no rops no texture units for low end useless, x1950pro more expensive older arquitecture, more power compsuption, and i tought that it would re-sell worse. 8800GTs no coments. So i think i did the best choice. Not to mention the great OC that puts 8600gt together with 8600gts.

I tryed now Call of duty 4, and it runs smooth in some places when moving the screen arround (with dual gpu option enabled or something like that) but when you look trought some kind of object, like barrels stuttering hapen. This is despite the frame rates, so this is not because my gpu is not powerfull enought.

Warcaft 3, old game when i move the screen it stutters, all time, anywhere, doesnt matter how long ive been looking into some place. (so no HD problem, or memory etc.). I ll try with some game without Transform and lighting, to see what hapen.
Trackmania forever, when im at grass, far away of the circuit, and im doing driftings in circles, the screen jumps rithmically even if fraps is displaying always more than 60 fps.

too late i think, just wait till nahalem then upgrade everything.

I installed windows many times, and installed a few diferent drivers. Forceware 169.21

Isn't that a crazy oc for a 8600? Tried default clocks? Why do you have dual gpu enabled in cod4, are you running sli?

help PLEASEEEEEEE

When your system slows, is your Hard Drive churning??

I did some research, and i found something about voltage regulators being too hot on motherboard, or graphic card. Causing system inestabilities.

How can i measure this?? P5k is not supposed to work without cooling, can i RMA it??

7900GS is less than half fps of 8600GT, dont talk about ocing. Its shader power is ridiculus.

I reinstalled windows and formated HD, and tryed some drivers beta and non beta, ofcourse they were nearly newest to the date.

Im looking to voltage regulators, can this be the problem??

Do something, buy 7900GS play Call of duty 4, Unreal tournament 3, Gears of War, Team fortress 2, Trackmania forever, after buy 8600GT and see wich card show more fps.

If not you cant talk. 7900GS is a very bad arquitecture now (does not have today games in mind)
And how the hell you show me a comparative where 7600GT outperforms 8600GT, when this card is 50/75% faster.

I agree, I saw that OC on your 8600 and did a double take. Despite the good cooling and being stable on 3Dmark, it is still very possible that your RAM is frying, or got fried, especially with a hefty OC like you have (especially since I believe you said that you have had crashes even after installing the Zalman).

Because I consider 3Dmark a "quick stability test". It will basically show you if you have gone waaay too far. However, IMO, it is not in any way a good stability test beyond just a "quick test". 3Dmark only runs for a couple minutes, then takes a break loading the next scene, then the gpu gets a pretty long break during the cpu test. The card never truly gets tested like it would if you were playing Crysis for 2 hours. Not even close.

You really want to stress your card even more than your would likely ever stress it while gaming. As for how long, my rule of thumb, since I never game for more than like 80 minutes straight, is to be stable under the worst circumstances for a good 2 hours. If you game for 2 hours max, then stress test for 3. Better to be safe than sorry. Plus if you OC truly is stable, nothing will go wrong, you'll pass the test no problems.

Also, since you are having problems. I think you should run a stability test on everything and see if you don't get any errors. You have a C2D, so grab the latest Prime95, run 2 threads, and run stress test in blend mode for a few hours.
If all that goes well it is much easier to assume that your aren't having a hardware issue.

However, with your gpu, I suppose it is possible that your core is running fast and cool, no problems (hence the high fps you get), but perhaps your gpu memory has taken some damage and is starting to go. I've never been a big fan of gpu coolers that totally ignore the RAM. Sure it doesn't get as hot as the core, but if you are an overclocker it is definitely something you shouldn't ignore. All the 3rd party coolers I get cool the RAM as well. One being the good ol' NvSilencer 5 on my old 7900GT (best 3rd party cooler ever).

I think what you need to do first is reinstall drivers, as mentioned, if you haven't done that. In fact, I would suggest, just to be safe, uninstalling the old drivers, then restarting (as you normally should do anyhow), then clean out all your temp files and clean your registry. Or maybe use some driver cleaner software. Then go ahead and install the new drivers. That way you can pretty much eliminate drivers being the issue. Also try older/newer drivers, something other than what you are using now.

After that, do the basics. Defrag, scan for viruses/spyware/adware, clean your registry, temp files, and I even manually go through my startup menu & services just to make sure nothing funky is going on there. If still having problems, a repair install of the OS often does the trick. Better yet, if you can do it easily enough, just do a fresh OS install.

Also, if you have TRULY stressed the crap out of your gpu and haven't turned up any issues, I would also highly suggest running an entire system stability test. I'm talking grabbing the latest version of Prime95, run 2 threads, and do blend mode. Run that for a few hours to make sure your system is stable. Btw, I would try this before doing anything more drastic like a fresh OS install, of course.

Maybe run some system RAM, cpu, and hard drive benchmarks to see that everything is performing up to par as well.
So there is all sorts of stuff you can do. However, if still have problems after trying most or all of the things I mentioned, I would have to assume there is a problem with your graphics card. Something that you likely can't fix.

I suspect memory simply because, from my past experiences, every time I've had stuttering in a game but at the same time had high FPS, the vid RAM seems to always be the culprit. Not that there is a physical problem with my vid RAM, but just that with some cards the RAM specs just aren't enough to keep up with some games at good resolutions, high settings, and some AA tacked on.

A good example of this is oblivion. Oblivion can really stress your vid RAM with the way it renders so much stuff from so far away. Even with my 8800 GTX there are some parts in the game, when outside, that I would get a little stuttering even though the fps are decent. So I'm assuming maybe something similar would happen if your vid RAM was damaged, except it would be a far worse case of the stutters like you are having.

I don't know, I'm not a super expert. Just keep troubleshooting or get a new card.