Have you attached 3rd PSU?
One PSU = 7 GPU
Two PSU's = 13 GPU
Three PSU's = 19 GPU
Partial support means that not all GPU's can be overclocked, first 16 GPU can be overclocked, last 3 GPU will work on stock settings. See the post from two pages back regarding TB250
https://bitcointalk.org/index.php?topic=1854250.msg23785755#msg23785755
You can do it all with one PSU if its strong enough, but you have to power the risers and GPUs directly from the PSU. The three PSU connectors are only to sync on/off the 2nd and 3rd ones, and the three molex mobo attachments are only if you are attempting to power the risers via the mobo.
Hello,
what version is NVOC, 0019 or 0019 1.2
