Ashkayt,
The problem you're describing doesn't look lie tearing issue. Tearing is when you see objects on lower part of the screen slightly shifted compared to the objects on the upper part of the screen. Typically that will happen only when you have a slow refresh rate on the monitor so that your eyes can still catch this slight difference. It is best detectable when you have ~60 Hz monitor and ~60 FPS because in such conditions the dividing line between previous image and the new image does not move fast. Having Higher FPS than monitor refresh still allows your eyes to see the disturbance (no harder in fact), but the images are shifted at most a few pixels. Only having a lower FPS would make the shift span more pixels, but then tearing would not be so visible since your GFX card would render one frame per several refreshes of the monitor which would make the tearing issue a lot harder to detect. Edit2: VSync ALWAYS solves tearing problems. It is so by definition so to speak. Also, I never ever had any tearing problems on my CRT.
Now that we have this out of the way, here are the options that are probably what's REALLY bugging you:
You say that your problems are lag, stuttering and / or choppiness.
1) Sound - You have SB, remove that first! Although your MB has the same audio codec as mine (A8N-SLI Deluxe) and I don't have any problems, please also try to disable the sound card in BIOS!!!!!! and try your games with that (without the sound). If that helps, download latest drivers from realtek. They work fine for me.
2) Your disk is running in PIO mode (not DMA). This seems quite a plausible cause for your problems. If you have a chance to try a PATA drive, please do that. Make sure you disconnect your SATA drive while testing though. You can see your connection type in Control panel \ System \ Hardware \ Device Manager \ IDE ATA / ATAPI controllers / xxx. In the devices dialog, go to Advanced settings and check "Transfer mode" combo box and "Current transfer" edit box to see what your transfer mode is. It should be at least UDMA 5, but in the end, any DMA will do for your problem.
3) You have another expansion card in your computer that is somehow incompatible with your other peripherals, such as your on board IDE controller. Remove all cards - period.
I find it hard that this would be your problem, since it would rather cause lockups / reboots but you can check it out anyway:
1) RAM - Run Memtest86 overnight
2) CPU - Run Prime95 overnight using torture test, the middle one (maximum heat)
I know you've been through all of this, but this must be like, what?, your 10th post about this problem. I understand this is bothering you, but do as I say. So far you were always very vague about what you have actually done. So tomorrow I want to see your post saying: "Yes, I removed everything but CPU, GFX, RAM and DISK. I ran memtest, prime and ATITool artifact tester. I made a clean install on an empty PATA drive which I borrowed from my neighbour. My huge SATA drive had more than enough space to backup that poor bastard's drive anyway. My drive is confirmed to operate at UDMA-5 and I downloaded the most recent NForce and Realtek and GFX drivers and YES, YOU STUPID IDIOT, MY GAMES STILL STUTTER / LAG / WHATEVER). NOW WHAT 'YOU GONNA SAY?" You can also add something along the lines: I also borrowed my friends 1x256MB RAM stick and even put that in instead of my own RAM or something similar about your CPU or something similar about moving all your stuff to another MB.
I want all that in CLEAR WORDING, no excuses about not really wishing to pull out your precious soundblaster, no excuses about not having any friend with at least a resemblance of your computer, NO EXCUSES, JUST CLEAR WORDING. I DID THIS, I DID THAT. Start with pulling everything out. Then check if it works. Only then gradually add things back. BUT FIRST, I JUST WANNA HEAR HOW IT GOES WITH JUST YOUR MB, CPU, RAM AND DISK. Everything clean installed. You DO have two partitions on your disk, don't you?
You're not the only one with the problems, but some of us don't post the same problem 10 times over. If I'm too dumb to ask / describe the problem so that people can actually understand what my problem is and try to help me solve it, then I back off and try to find a solution using other means. Your persistence is becoming admirable. Not to mention your evasiveness when it comes to actually trying the suggestions people propose. Sometimes I just feel like sitting on the plane with my comp to go to your place and start replacing parts just so that this would finally stop.
Now go do your homework!
Edit:
Clean install is composed of:
1) Restoring BIOS settings to all defaults
1.1.) For the first run / insertion of SB card also disable onboard sound in BIOS. In any case MAKE SURE YOU *NEVER* HAVE BOTH sound cards enabled.
2) Inserting a Win 2000 / XP / whatever CD into your CD drive and booting from it
3) Selecting an EMPTY partition and FORMATTING it again. You can use quick format although with your problems I recommend against it.
4) Installing windows
5) Installing NForce4 drivers (platform), without NAM, IDE and sound drivers
6) Installing latest GFX card drivers
7) Installing latest sound card drivers (on the first run, you don't have any sound cards installed, so you don't have to install them)
8) Installing one of the games that is problematic to you
9) Running the game in question and observing the results
Edit3: That said, I symphatize with you. I too had a problem nobody could help me with. It was only at about the millionth variation and test that I discovered the cause of the problem which in turn allowed me to ask the right persons the right questions to solve it.
Jure