are you drunk? first of all, using a single 120mm radiator to cool a CPU and a GPU is f*cking retarded. 240mm AIO coolers are barely capable of handling a single overclocked 3930k...
Second, solar panels generate electricity, they don't reuse waste heat or allow denser server configurations. Not everyone even has a suitable place to put solar panels anyway, let alone enough to power an entire datacenter (not to mention the damn things aren't going to power the datacenter AT ALL during the night!)
In all likelihood, they discontinued that underpowered POS because...it's an underpowered POS.