While I may not agree with Tyll's opinion of the 840 vs the 940, Tyll is very highly respected and I trust his assessments implicitly because of all the work he's put in and the methods he uses. Tyll has earned his respect. Again, what are your credentials? Also, you still have failed to mention what your rig consists of. hile I may not agree with Tyll's opinion of the 840 vs the 940, Tyll is very highly respected and I trust his assessments implicitly because of all the work he's put in and the methods he uses. Tyll has earned his respect. Again, what are your credentials? Also, you still have failed to mention what your rig consists of.