[CaptainHaplo]

Go with the sound system....

I totally agree about how something isnt right on your pc mate. I am running a x1650 and SH4 runs great. I start having issues with stuff like Crysis running max but who doesnt?

Since everyone has hit a number of things - a couple of others to check are due.
You mentioned tweaks - have ya done stuff like killing extraneous processes? Especially your AV stuff. Just release your IP, kill the AV and other stuff, and away ya go.

Second - check your ram timings - make sure that they are matched - I have seen multiple banks not running spread spectrum and it eats things alive. Also insure you have EC turned off in the bios if your mb supports it.

Another thing to check is review the cfg files - there is one (which has slipped my mind but you can search) and turn off the debug options. This has helped alot of folks.

Run some checks on how ofter your drives are accessed while you play. Alot of disk accesses can show either memory issues or swap file sized wrong.

One last thing - in the bios - check and make sure you have not enabled AGP shared memory. In many MB that have integrated vid chips (even when your not using em) - the board will allocate system memory to the chip even though it wont be used. This shared memory is another system killer.

This still isn't a comprehensive list, just some thoughts at random. There are more rattling in me head.

Oh -one last one - how bout a list of mods your running and in what order they are instaled - mod conflicts can not only make things ugly - they CAN cause performance issues.

Edit - your sys specs show your mirroring - turn that off when ya game man - your doing nothing more than causing your system to write stuff twice - including stuff like the swap file!!!!