Looks like Bittware reduced their standard warranty for the "crypto" models. I believe they typically have 1 yr mfg warranty on their products. Kind of disappointing the warranty was reduced that much for a $6k product.
Yes, a 90-day warranty raises a LOT of concerns. Has Bittware done stress testing and has some reason to believe the failure rate ramps up after that timeframe? I could understand a 90-day warranty on support issues with a 1-year hardware warranty.
I was in the process of arranging my finances to purchase a few cards, but if the manufacturer has that little confidence in their product, they're sending me a message I can't ignore. Even the Chinese manufacturers (with their notorious quality) give 180-day warranties.
For any European purchase, the minimum warranty time is 24 months. That is why it would be better to buy those card from your local dealer, than bittware directly.
Of course, your local dealer will take this into account for pricing.