We have a public mumble server which you are free to use as long as you can maintain a certain level of maturity. You can connect to this server with the following settings;
Label: Craicer
Address: mumble.craicer.com
Port: 3612
Username: Whatever
Keep in mind you will need to right click your name and select register before you can enter channels.
Case: Antec 302 Ultimate Gaming Case
Motherboard: Asus P8Z77-V LX
Processor: Intel i7-3770K
Memory: Corsair Vengeance Blue 8GB (2x4GB)
GPU: Asus ATI Radeon HD 6870 DirectCu
There's no specific group of settings that will work for everyone - I change mine quite regularly - but you can use this as a template and tweak according to your specifications and internet connection. At the minute I am using Open Broadcaster to stream simply because it has very little negative impact on my in game FPS. I use the following settings;
Base Resolution: 1920x1080
Resolution Downscale: 1.5 (1280x720)
FPS: 30
Quality: 10
Max Bitrate: 2500
Buffer Size: 2500
Preset: Veryfast
