A study by Neal Nelson and Associates found that AMD Opteron server processors have a higher power-efficiency than Intel's Xeon chips:
Specifically, the independent computer-testing firm announced today that it, in the tests, "the AMD based server used 7.3 to 15.2 percent less power at five different user load levels and 44.1 percent less power while the systems were idle and waiting for work."
That translates to annual electricity savings between $20.29 per server and $36.04 per server, depending on the workload, the study concluded. At idle speeds, it amounts to a $99.76 per-server, per year saving.
"AMD must have put a lot of energy into optimizing the power usage for their products and it appears that AMD's customers will now realize significant energy savings," said Neal Nelson, president of the testing group, in a written statement.
Neal Nelson and Associates took a new approach for this test, employing at client-server benchmark where Web transactions were processed against a server running Novell SUSE Linux, Apache2, and MySQL. The tests were run on similarly configured 3GHz Intel (Woodcrest) Xeon and AMD Opteron servers, according to Neal Nelson and Associates.