I have both systems running and the E5450 modified on 775 board I'm planning to sell one which one would you recommend me to sell I'm not gaming right but I do a lot of multitasking and some video rendering.
A6-5400k has a passmark rating of 2134 and a single thread rating of 1310.
E5450 has a rating of 4254 and a single thread rating of 1269.
Your processing will benefit from the added cores of the e5450 with little degradation for gaming.
single core of a6 its faster? if I overclock the a6 could it be as fast single core to the e5450 ?
It would appear so, but for multithreaded apps, the e5450 will be better.
No idea now well a A6 will overclock.
Since you have both, why not test your work on each?