"Benchmarks" depend entirely on the specific system. What Windows version? How much memory is installed? How fast that memory is? What the timings/XMP profile are configured to for the memory? How much garbage is installed on the system in terms of additional applications, mods, overlays, how old the OS installation is, etc.
You have to understand as well that for most "benchmarks" you see, those are being achieved on basically "lab clean" Windows installations that have nothing more than a clean install of the OS and whatever game or benchmark they are running, which makes a big difference when comparing it to some daily driver system.
No, there should not be any significant bottleneck due to your 1650 Super and 3400G. They are pretty fairly matched.
What does the rest of your hardware configuration consist of?
What is your motherboard model? Memory kit model? Exact power supply model? Storage device models? Case model? CPU cooler model? How many case fans and how is each of them configured, as intake or exhaust? What Windows version are you running?
What is your current motherboard BIOS version? Have you gone to the product support page for your motherboard lately, or ever, and downloaded the latest network adapter and audio controller drivers? Have you gone to the AMD website and downloaded/installed the latest chipset drivers for your CPU/motherboard, or the latest ones from your motherboard product page? Have you updated to the latest Nvidia drivers for your graphics card and if so, have you tried using the DDU to do a clean install of the latest drivers for it?
Have you checked your thermal readings for both the CPU and graphics card using HWinfo to see if maybe there is a thermal throttling problem?
What and where are you seeing your graphics card "underperform"? Is this in a game and if so what game? Is it in a benchmark and if so what benchmark?
If it's in game, have you checked to see if there are updates or patches available for that game that you have not yet installed or updated to?
How OLD is your Windows installation, or rather, when was the last time a clean install was done?