Kaios wrote:You can try this client though and see if there are any noticeable changes.
Those changes have already been merged into the mainline client; that's why the file doesn't exist anymore.
In OP's case, the problem is most likely the GeForce 405, which is such a budget card that it wasn't even available for general purchase. Certainly one could argue that the client should have options to lessen GPU load, but nevertheless, that is most likely the problem as it is.
As for the sound stuttering, you may want to play around with the audiobuf command.