Blackwell + consumer GPU

My machine isnt that terrible.. but nowhere near what some people run as an aI workstation. I am wondering if i can combine the 2 GPUs. I got a cheap Blackwell 4000 (little bit under MSRP) 24 GB and have an old 3060 12GB .. I was gonna try to get the best model loaded, mainly coding tasks than anything else and work with it relatively safely with a good buffer. any recommendations ? and will tensor split work on this combo?