wintaper
Phish record live @ 48kHz and they get pretty good results
Umphreys Magee do theirs @ 44.1kHz I believe.
16 tracks @ 96k is the same as 32 tracks at 48k ... I don't see that happening on an AMD 2.2 dual core.
I'm not making this up - I record multitrack all the time - up to 32 tracks @ 48/24 - without issue ever - right onto the built-in 500GB 7200 rpm drive on my MacBookPro (boot camped to XP).
One thing you should do is set Sonar to allocate disk space in chunks when recording. This will prevent file-resize thrashing as the system constantly recalculates remaining disk space. I have mine set for 300 secs - I've used as high as 600 secs. This means the system will allocate 5 or 10 minutes chunks per recorded wave file. This alone may solve your issue
Another thing is turn off waveform generation while recording .... it eats RAM - yes RAM - not a lot - but the waveform calculation also steals CPU. Turn it off. (you will need to wait for the waveforms to generate after recording. If you don't want this to happen immediately after recording - minimize the waveform view window.
Of course - no plugins - routing - anything that "works" sonar is bad. Close all other programs. disable wireless, defraggers, everything.
and definitely check your machine's DPC latency as suggested by others
I've already done 16 @96, without issue and without having to disable a ton of other processes, ports etc etc and whilst running off the battery at one point having forgotten the power strip. So you can imagine my frustration at supposedly having a better system now, with [far] worst results.
I've done a lot of tweeking at home, but until the new RAM arrives, I won't know how much effect it will have made. The allocation thing I've yet to do though.
I've been multi-track recording live bands for years, but had always used dedicated hardware like the HD24 at venues, whilst having the usual kind of PC rig at home. This is the first real venture into using laptops/software for that situation and I did initially go down the Presonus Lightpipe route, but with no working express card slot, that had to go.
When I started checking what other people were offering, I decided that to be able to make use of the 96 angle if need be would be good and, having already had that working successfully, why not. That may well change, it may well get limited to 48 for the sake of an easy life, but not until I've fully investigated why the 96 isn't working.