Originally Posted by HydrogenHuman
I will tell you from personal experience, that Xsplit is a resource hog, and no matter how powerful of a CPU you have you will get some lag from using it. More than likely the reason why you are lagging is if you are trying to stream at 1080p with 60 fps, even 30 fps, the computer can't handle rendering that many frames on that high of a resolution. The other reason you may be running into trouble is because of Xsplit's "Preset" in the Streaming options. I don't know if you know what I'm talking about, but basically the "preset" is this setting in Xsplit that tells the program how quickly to render the frames being streamed. I found that if I went any slower than the "faster" setting, the computer would slow down, and my stream would lag.
So in short, I would tweak the settings of Xsplit before worrying about if you computer isn't powerful enough, because it is.
Edit: I just noticed you had an HD 4870, and that is most likely the culprit. However, I bet you if you streamed at 720p, (which you can do while still playing the game at 1080p) you will notice a big difference. I also would recommend keeping you stream's fps at no more than 30.
These are my current xsplit settings: http://i177.photobucket.com/albums/w208/Yatta7/Randoms/xsplitsettings.jpg
My VBV buffer is as low as it is because I'm blindly following what is said here: http://www.gamereplays.org/community/Tips_and_tricks_on_optimising_your_XSplit_broadcast-t773948.html
Which references http://mewiki.project357.com/wiki/X264_Encoding_Suggestions#VBV_Encoding
I don't understand a damn word of what's said there, so if it's bull ****, I'll raise my VBV buffer back up.
Of course, I increase the bitrate when I try 1080p. Currently I'm streaming at 720p while playing the game at 1080p as the game I'm currently playing most sees little difference between playing at 720p and 1080p. But if I switch to CS:S (hopefully Global Offensive won't have the same issue) the text becomes completely unreadable on the stream.
As for the graphics card, I've been told that, since the stream itself does very little with the graphics card, if I can run the game smoothly with my GPU, then I should be able to live stream smoothly with it as well. And all of the games I currently play I can run at max settings (AA and AF included) with a minimum of 60fps. The most graphically intensive game I've played recently is only Portal2, though.
Streaming has very little to do with utilizing the hard drive, primarily because it is just uploading the frames online. If he was recording footage onto his computer at the same time, then yes it would be a big factor.
Even if it did, my xsplit is installed on my SSD Edited by YattaRX8 - 7/23/12 at 9:00pm