One thing I will say about the Einstein Intel GPU app - it needs about .5 CPU to run efficiently, and if you don't limit CPU projects to keep from interfering, your production will suffer greatly.
Silly me, giving advice on Einstein's Intel GPU app and not paying attention to my results... since updating my Intel GPU drivers in late January I've had over 1000 invalids on my i7-4790k. From the Einstein Forums:
"You're currently running driver 10.18.14.4080, which is known to produce bad results on HD 4600 GPUs at Einstein.
To run with the current Einstein application, you need to revert to the 10.18.10.3621 driver, as discussed in the BRP4 Intel GPU app feedback thread."
D'oh!