Maximum audio tracks possible?

Hi all
Sorry this may have been answered somewhere before recently but couldn't find an entry in the discussion database.
Has anyone ANY idea how high we can fly with numbers of audio tracks on 8 core 3 gig with 10 gig of ram? (my spec below)
I expect it's down to hard drive speed (my audio drive is 7200rpm)but I'm about to mix a huge number of stems ..... all made up of 5.1 interleaved stems and I'm also using some Kontakt3 & PLAY sample stuff on another drive?
Anyone got any idea how many "ish" are comforably achievable?
I'm looking at using in excess of 12 x 5.1 interleaved on some passes (that's 70 audio tracks) ..... should that still be small fry?
Anyone got any guiding lights of experience?
Many thanks
Dick

ok, so i just tried again with a different type of cd-r, and the burn finished, but it still took about 20 minutes, which is significantly longer than it used to take. any ideas?

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