SGDMA to SDRAM speed?

Actually I don't understand much about this stuff, I'm starting out because of the Intel Embedded Systems Competitions (http://sbesc.lisha.ufsc.br/sbesc2015/intel+embedded+systems+competition). I've tried doing a LOT of research but the documentation seems to be sparse on what concerns these IP modules (PCIe, DMA, and many others). The best documentation that I've found was the "Video and Image Processing Suite User Guide", which is pretty good and deals with the whole Avalon-ST stuff but takes a lot to get to the point.