Digital Foundry RX 6600 XT review:
So: the RX 6600 XT looks like better value than the RTX 3060 for 1080p gaming, but both cards are outdone by the RTX 3060 Ti. The further you stray from the rasterised 1080p box - say, by adding RT or upping the resolution - the RX 6600 XT gets comparatively weaker. If it were a bit cheaper - say $349 - then I think the AMD offering here would be much stronger. (And indeed, the UK price of £329 makes the 3060 Ti £40 more expensive, making the 6600 XT's performance more reasonable).

However, all of this supposes that graphics cards are actually readily available at or near RRP/MSRP, and as we all know we don't currently occupy a reality like that. As it stands, pretty much every card bought at RRP will be a better value than an ostensibly better competitor bought at an inflated price. If AMD's partners are able to produce an avalanche of these cards, then they could be on to a winner. If not, well - better luck next time?
AMD Radeon RX 6600 XT review: solid 1080p performance, but falls away fast at higher resolutions • Eurogamer.net