Hi Jonte,
The Geforce 6200 is not a good card. It is slightly better then integrated graphics. It does have better shader support (DX9) compared to your old 4600Ti, but it wont give you a FPS boost.
I suggest you try a minimum upgrade to a nVidia Geforce 6600GT 128 MB AGP, or ATI X700 Pro 128 AGP (if you can find it), to see a noticible difference in FPS. I think the 6600GT should be somewhat affordable and you can still find it on some sites. The AGP cards are a lot more expensive nowadays then the newer PCI-Ex cards with similar specs due to being phased out slowly.
Maybe you should stick to your current rig for the time being, till such time you are ready to invest in a new machine altogether.
I doubt the onboard sound is a bottleneck, its the whole system generally. The processor @1.2Ghz is also on the low end for this game, and so is Ti4600.
Hope it helps.
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Core i7 4790K
16GB DDR3 RAM
Nvidia GTX 1080Ti
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