If these are coming in September, they'll have a months start on AMD, as those are rumoured to be October now.
They wont be "coming" in September they might be released then but they wont be available to buy for ages. Could end up being by time stock is available both AMD and Nvidia release at same time.
Looking back for instance 2080ti pre-orders were 20/08/19 with shipping eta as 20/09/19 and they didnt ship till 5th Oct with some as late as 28th Oct.
So with that and taking into account the virus (based on Oculus Quest stock) that would make it March next year before FE stock is available.

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