(if I read myself back, what im pursuing is not clear at all lol). I must have been in a hurry.
My D7000 is using SD only so the sandisk extremes were the fastest available with 95mbs. But the D800 uses both SD and CF. So I will be ok to use the camera, but I will have to check if they're as fast on the D800 then on the D7000; probably not since the D800 files are bigger and the promised fps is lower.
So since the D7000 is 7fps (with the fastest SD card on the market) and the D800 is 4fps, I might need to get the fastest CF card available to reach the closest possible of that promised performance.
But i'll try my SD cards first. If I can save $300, my wallet would gladly thank me for it.