Any idea what specifications the graphics card should be for GPU rendering
To be more specific what kind of speed increase could be gained over a range of different cards
I'm currently using NVIDIA GTS250 - 128 core - Graphics clock 738 Mhz - Processor clock 1836 mhz Memory ( I think 512)
May upgrade but wondering how much to upgrade to For instance does the performance gain level out at a certain specification
More GPU power always helps. and the NVIDIA Titan is certainly the fastest card on the market right now, and AVP benefits from the the additional power, but you can get smaller cards as well. as a non-scientific reference, a GTX 770 (1500 CUDA cores, 4GB) will render 4k output at 4.5fps.
Also if purchasing gopro cameras do you need to make sure they are from the same batch to match picture
not necessarily, they will all stitch nicely as long as they all run the same firmware version. AVP/APG will handle the subtle differences. but have a look at the serial numbers: I found the cameras from recent batches (serial numbers in the 4xx and 5xx range) more reliable than early 1xx and 2xx models.