The cards have two links that do 10Gbps in each direction. The 16MB buffer will hold 7ms at worst (double if the links are unbalanced and the buffers shared),

The cards have two links that do 10Gbps in each direction. The 16MB buffer will hold 7ms at worst (double if the links are unbalanced and the buffers shared), which might be okay for web content. Frankly CloudFlare should focus on making their ddos filter more realtime and get over their fear of dropped packets.