So, here's my current data. It's limited sample size (as in, one of each GPU), so take it for what you will.
- 3080 FE: No repeatable crashing during testing at stock. Overclocking did encounter instability at +75MHz in a couple of games, but passed at +60MHz.
- 3090 FE: No repeatable crashing during testing at stock. No OC testing yet.
- Asus 3080 TUF Gaming OC: No repeatable crashing during testing at 'default' clock (didn't test OC mode yet).
- Asus 3090 TUF Gaming OC: No repeatable crashing during testing at 'default' clock (didn't test OC mode yet).
- MSI 3080 Gaming X Trio: Initial pre-release driver (456.16) crashed in Metro Exodus consistently without a -20MHz underclock. 456.38 driver appears to have corrected this. More testing is needed to confirm.
- Gigabyte 3090 Eagle: Consistent crashing at factory stock in multiple games (Shadow of the Tomb Raider, Metro Exodus, Forza Horizon 4, and The Division 2). -20MHz underclock fixed. Updating to 456.55 drivers to see if that changes anything.
So far, any card that maintains more than 2000MHz during a test has been questionable, but I haven't closely looked at the Asus card data. The 20MHz underclock on the MSI and Gigabyte cards is enough to push them to 1980-2000MHz in the tests I've checked. I can say that at default clocks on the Asus 3090 (1740MHz), things appear quite stable. I've just applied the OC mode profile, which bumps the clocks to 1770MHz, so now I'll see how that goes.
A minor tweak to the drivers to just limit boost a bit, or maybe tune some other aspect, might be enough to correct the instability. Yes, it's a bad showing for Nvidia's new Ampere GPUs and drivers at launch, but we have seen early drivers on new GPUs with issues before. What will really matter is how things are going forward. If the 456.55 and later drivers take care of the instability, the number of people really affected is going to be very small, for less than ten days.
There's the other aspect to consider, though: Even if the updated drivers fix the crashing problems, there's a very good chance manual overclocking is going to be quite limited on the GPU core. (VRAM overclocks could still hit 20.5Gbps, though -- we'll see.)