Well the i7 930 would be better if your programs do support Hyper-Threading or can use more than more than four threads, if they don't use threads made by HTT, then the 1090T would be faster.. The Phenom II X6 1090T does not use triple channel RAM. You cannot use 3x2GB as 2x3GB dual channel, it'll run at 2x2GB & 1x2GB single channel.
Honestly, I'd say neither. What you use your computer for doesn't justify spending the extra money on those CPUs. If I were you, I'd get an AMD Phenom II X4 955 and use the savings towards an SSD which would have a much greater impact on overall system performance than those two CPUs ever could. For folding, the GPU you select also makes a difference because folding programs support CUDA and AVIVO. As a result, you can still get great folding numbers without having to go broke. Believe me, compared to an Athlon, the Phenom II X4 is a brutal monster and you'll be ecstatic with the performance increase. Remember, it's cheaper to get just a little more than you need today and upgrade later because by the time you actually NEED the 1090T, it or something better will be a lot cheaper than the 1090T is today and you'll still be able to drop it right into the CPU socket you have. Because of this backwards-compatibility advantage, AMD is the better choice for you but not the x6, the x4 is all you really need.