The SFX unit handles the 2990WX, which can pull 250W on its own along with the TITAN V, both pulling heavy render workloads. This attributed to around 530W of load with the cooling pumps and accessories.
Moving up to two cards by adding a TITAN Xp CE and we see the load eclipse the 700W input mark into 730-740W range depending on the thermal and power limit throttling of the GPUs. The fan on the ION SFX 650G throttled up a bit at this point, and I'm not necessarily surprised as we are pushing a significant amount of power through this unit. The baby ION unit was up to the task, though, as exhaust temperature shown here was after an almost two-hour burn-in with these settings under a constant render loading.
The thin 120mm fan was audible at this loading, but let's be honest, anyone running a load like this should be in the 1000W range to give some headroom for better efficiency. We are just happy to report that the ION SFX 650G pulled this off and not only as a burst but no instability or shutdowns for this.