As always I like to start my testing with a few synthetic benchmarks. 3DMark especially is one of my favorites because it is very optimized in both Nvidia and AMD drivers. It's nice to not have to worry about it being favored too much either way and the repeatability of the results makes it a nice chance to compare from card to card. It also gives us our first looks at the performance of the RTX 3070 Founders Edition. My first tests were using the older Fire Strike benchmark which is DX11 based. Here in the performance and extreme settings which are most comparable to 1080p and 1440p the RTX 3080 and the RTX 2080 Ti came in ahead of the RTX 3070 with the gap between the 2080 Ti and the 3070 being very small. In the Ultra setting, however, the RTX 3070 pulled ahead of the 2080 Ti. The gap between it and the RTX 3080 is huge though.
I then switched over to Time Spy which has two detail settings and is DX12 based. The RTX cards have shown their performance in these in the past and it was no different here. The standard Time Spy had the 2080 Ti out ahead of the 3070 with a relatively big gap but them just 70 points off in the higher detail Extreme setting. The jump of 55% from the RTX 2070 to the RTX 3070 is especially impressive.
My last synthetic benchmark was using the Unigine based Superposition benchmark. I tested at 1080p with medium detail and then with extreme detail. At the medium detail the RTX 2080 Ti was out ahead by a good amount but with the detailed cranked up, they are neck and neck.