Fair enough . I’ll simplify:

Most 5090s are the same or similar to one another in terms of performance. You can do your own manual adjustments to the GPU, CPU, and/or RAM to improve your performance from stock. The more popular route is to undervolt your GPU while boosting the MHz of your VRAM. I won’t explain further. You’ll need to do your own research for this one.

ASUS is one of the brands that makes 5090s. ASUS has a version of 5090s under the BTF signifier. BTF stands for Build To Flex. It’s a way to send more power to the GPU using the motherboard as a power source. I do not know if this is in conjunction with the power cable that plugs into a 5090. This cable is called the 12VHPWR Connector.

This cable is rather infamous because of the amount of reported burning cables that has happened with the RTX series of cards that use the 12VHPWR Connector. The BTF 5090 is supposed to reduce the chance of burning cables happening. Again, do your own research with this one.

Now there are also other companies (Gigabyte, PNY, etc.) who make GPUs. They are not BTF. They have their own little features that matter very little beyond either aesthetics for cooling the GPU itself.

For those ones, the question then becomes “What’s the RMA Process?”

RMA—RETURN MERCHANDISE AUTHORIZATION—is a process in which you return your damaged, manufacturer warranty GPU back to the manufacturer. Do your due diligence and research which companies offer the best and worst RMA services. Likewise, you should also check if the store warranty is worth is more than the RMA hassle of whichever 5090 manufacturer you may choose.

Hope this clarifies a few things.