Is Geforce and Nvidia the same thing?
The GTX and RTX cards work with Kangaroo, those are Geforce cards. There are other, older cards, that if they are Geforce cards, will work as well.
How many number of cuda core require for use cuda gpu?
my dell nvidia gpu GT 720M have only 96 CUDA core (very old) it is can not using cuda function can not use CuBitcrack, can use only OpenCL version
but GTX 1050 have 640 CUDA core can work with cuda function normal no problem
look like it require to have cuda core over 500 cuda core or some require of cuda core, then nvidia gt, gtx old version that have very low cuda core can not using with cuda function I not sure may be can use with old version like cuda 8.0