OctaneBench sees decent improvement for the RTX 3090, with scaling slightly better than what we saw in our games testing. Running the test first without RTX sees a boost of 18% for the RTX 3090 Eagle OC, when compared to the RTX 3080. Turning on RTX further increases this to 20%.
SPECviewperf 13 doesn't scale as well, however. Gains over the RTX 3080 vary from between 8-12% depending on the exact test, and even compared to the RTX 2080 Ti, we saw a difference of 18% at most.
It is V-Ray where we see the single biggest performance improvement for the RTX 3090, relative to the RTX 3080. In this benchmark, RTX 3090 outperforms its smaller brother by 23%.