Please provide the RAM part number, it is usually a long number so we can find the specifications of that RAM.
Also provide the processor model that you are currently using so we can check voltage requirements.
I would suggest either the 2nd generation Core i7 processors or the Intel® Xeon® processor for your needs, in this case since you will be running many applications at the same time, then the more cores the processor has, the better performance the system has, since it can handle more tasks at the same time.
Also you need to take in consideration high amount of RAM since you will be running many applications at the same time on the same system.
So you might want to think about 8-16 GB RAM.
If you need to compare the features of our processors please check this link:
From there you can select any processor family and then you can compare different models, even from different families side by side.