I also have an old GPU, GeForce 8400 GS, and I haven't been able to mine with it, I was trying to mine a cryptonight coin but haven't found a miner that supports 1.1 computing. I searched for ccminer 1.0 but it says it only support 2.0 GPUs, is anyone here who have tried it who knows if it also have support for 1.1 GPUs? I don't want to mine scrypt coins because there are a lot of ASICs out there, and even in a pool it won't be profitable at all.
believe me that I have tried an infinity of mining program with disappointing results, although I encourage you to search, if you find any program compatible with this forgotten architecture
right now I suppose some things
In the search, I have found that some algorithms can be mined, such as decred, lyra2v2 and neoscrypt, but this is based on open.cl, which I would venture to say offers a horrible performance for the nvdia card
I have investigated the possibility of implementing the algorithm "cryptonight" because it is one of the few that can be taken advantage of this type of cards (and no, it's not precisely for monero)
my deduction so far is ...
I do not think there is any impediment at the level of instructions in the GPU (such a necessary case in cpu)
I suppose you would have to compile from 0, to which I mean? adapt the algorithm
cryptonight based on the architecture of the gpu compute x1
I would love to try it but I have 0% knowledge in the c ++ language, CUDA and the times that I have tried have been total failure and because of my inexperience of understanding the architecture and the compilation language used
There are also no guides based on the creation of a mining GPU softwaer that helps