The Solarflare SFN8000 and X2 series adapters support many more than the 120,000 packet buffer without the need to switch to Scalable Packet Buffer Mode.
Each buffer table entry in the SFN8000 and X2 series adapter can describe a 4 KB, 64 KB, 1 MB or 4 MB block of memory where each table entry is the page size as directed by the operating system.