Very roughly: Few long-running CPU bound jobs benefit from smaller number of faster CPUs. Many interactive (waiting often on IO) jobs benefit from larger number of CPUs even if they're slower. Cary&Jeff's book describes this stuff thoroughly. Tanel. ----- Original Message ----- From: Allen, Brandon To: oracle-l@xxxxxxxxxxxxx Sent: Thursday, January 19, 2006 5:19 PM Subject: CPU count vs. CPU clock speed We've gone through a few hardware refreshes lately and the vendors seem to be encouraging consolidation on less CPUs since the new ones are so much faster than the old ones, but I am skeptical of the reasoning behind this. What is better (just for example) - 10 CPUs at 1GHz each, or 5 CPUs at 2GHz? Of course for the purpose of discussion we have to assume all other system components are identical, and since this is an Oracle list, let's assume we are running Oracle on the server.