Allied Telesis AT-2973T (NetExtreme II) - Manual (Page 113)

AT-2973SX and AT-2973T NetExtreme II Family Adapters Installation and User’s Guide
113
Solution: This is a Microsoft issue. For more information, see Microsoft
knowledge base KB913119 at
http://support.microsoft.com/kb/913119 .
Problem: Performance is degraded when multiple BCM57710 network
adapters are used in a system.
Solution: Ensure that the system has at least 2 GB of main memory when
using up to four network adapters and 4 GB of main memory when using
four or more network adapters.