I got a 3060 Ti in the last sale so let me share my experience with folks here. Here it goes...
I logged in at around 9:30AM in at 3 tabs in one system & 1 tab in another system. As usual the site stared showing up different kind of error as the sale time approached. Anyways, these errors kept kept happening & even the product didn't come on sale at least till 11:30AM - 12PM I think. Once the cards were available again we started seeing multiple errors.
The trick was to get the card in the cart & be able to select address. It always used to fail in one of these steps. Once the card was in the cart, I kept refreshing all the tabs & trying to select delivery address. Folks will tell you to wait in case of something is loading but I found that there were no reason to wait if there are error in the browser console, just hit refresh. Try to open the web console(F12) to see if there are multiple errors on the page. Finally the engineering degree was starting to payoff
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Mind you this kept happening till about 1PM when some luck folks were finally able to snag 3 of these. I had it in my cart at around 12PM I think, but was only able to move to payment page at around 1:18PM. Did the payment using UPI, it seemed fastest to me. After the payment, I was redirected to an error page that my order could not be completed. WTF!
Meanwhile, all this time I was also following a reddit thread for sale update & folks there were pretty certain that If you have made the payment, you'll get the card even if the order did not complete. Anyways, the stock was 0 at around 1:25PM. I was finally happy that I would be able to get my hands on the card but people started getting refunds at around 3PM, those whose payments had gone through but order did not complete.
Dread filled my heart that soon I would also be getting my refund. Fortunately this did not happen. Meanwhile, I also sent a mail to RPtech as soon as my payment was done with screenshot of the payment & all that my order didn't go through despite the payment. I later got a mail that day from RPTech that my payment was done but order was not completed correctly so they asked me for transaction details & address. Finally got the card 3-4 days later. Phew... It turned out folks whose payment had gone through after 1:20PM were not so lucky so timing of the payment & stock availability at that time is what really matters.
Anyways, best of luck to the people trying on the sale!