Reason why I ask is because I was told that videoguys suggest the 570 and I already own the 560ti so I am thinking there isn't much diff between performance for vegas. I would still get random sluggish playback.Any takers? ; )
1- It is not random sluggishness that you get during playback. It happens when your computer has more demanding tasks to accomplish.
2- Yes, the gtx570 is not capable of doing full 30fps rendering when you keep it busy with special effects, etc. The 580 does much better but still has its sluggish moments. The only card I have ever tried that managed 30fps no matter what I threw at it was the Radeon HD7970. But I had major compatibility issues and had to give it away.
Please excuse my ignorance, but won't fps replay in VP 11 be determined by the combination of CPU & video card specs? (It's a genuine naive question). In other words, if I have a brand new powerful CPU (e.g 2011 architecture) teamed up with say a 560ti, would that necessarily have a lower fps display than say an older, less capable CPU teamed with an nvidia 580?
Hope someone can enlighten.
Just an extra post to qualify my earlier answer. Yes, having a combination of powerful CPU with powerful GPU is the best way to go and you'll get the best of both worlds when you render. But when it comes to playback, the video card is the real thing. It makes or breaks the system.