Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Also check out this shader mod, makes me want to try playing minecraft again, but I rather not haha.
http://www.minecraftforum.net/topic/940974-125sonic-ethers-unbelievable-shaders-glsl-shaders-dynamic-shadows-more/
I really want to replace my GTX580 with one of these but I think I'll wait until 790 =p, and when I get a job again. Have to say though, this card looks amazing for those who don't want to use more than one pcie slot.
Also try streaming at a higher bitrate if you get a 2 pc set up working. I'm pretty sure that your hardware is having a hardtime rendering a higher quality stream while gaming at the same time.
Checking out the xsplit forums, the best way to have no performance loss while streaming is to buy a capture card and to have a decent laptop or another computer as the streaming computer so xsplit doesn't use up resources from the gaming computer.
I play the game on max settings (I think, playing the Korean version) with a GTX580. Before I edited the .ini it would run up to 80fps (hard cap) until I limited it to 60fps. I think it drops a bit sometimes but barely noticeable.