1 - Single core processor of 1Ghz (i.MX 6Solo from FreeScale), 512 Mb Ram
2 - Dual Core processor of 1,2Ghz (i.MX 6DualPlus from FreeScale), 1Gb Ram
3 - Quad Core processor of 1,2Ghz (i.MX 6Quad from FreeScale), 1Gb Ram
It would be also interesting to mention, for which task would be viable (face recognition or object detection).
I will get next week a Nitrogen platform, and I'll try to do some testing over there - http://boundarydevices.com/product/nitrogen6x-board-imx6-arm-cortex-a9-sbc/
Looking forward for opinions & suggestions!