A GT 1030 passive low profile is ideal for several purposes. For example, I have the Gen8 in the same room with a 4K TV from 2014. The integrated player of the TV is old and does not receive updates anymore, and even if the TV is 4K I cannot play too much content on it. I am thinking in the future to use a dedicated Video card for Gen8 with HDMI port which supports 4K resolution. In this way I can play on TV at 4K video content. As far as I know GT 1030 is the only low profile/passive/single slot video card which supports this resolution.
The 85c number comes up often in these discussions. I think it may be the upper limit for iLo on certain devices. If it were mine I would set up a fan/blower to blow air directly on the heatsink of the P420 and see what the numbers look like in SSA and iLo.