Author: Frederic Louguet
Date: 02:37:21 08/31/05
I've seen interest in some posts about dual opteron dual core configurations. As I built such a system about two months ago, here is some information which may be useful to some of you : - Details of the configuration : http://www.k8we.com/?q=node/280 and http://www.k8we.com/?q=gallery&g2_view=core:ShowItem&g2_itemId=1058 - About memory, Windows XP Pro 32 bit sees a maximum of 2.75 GB (due to PCI express and peripherals address range). Windows XP 64 has not this limitation of course. - Two dual core dual Opterons (265/270/275) are seen as a 4 CPUs setup in XP Pro 32 and XP 64, so no problem for running 4 theads. - The rig is perfectly stable at 2442 MHz (222 x 11) @ 1.40V or 2387 MHz (217 x 111) @ 1.35V. When I mean stable, I mean 4 x Stress Prime 2004 for 48 h, heavy multitasking, 3D and video rendering and 3D games without crashing since I built the system. Of course not all systems overclock the same. I know that a lot of people are not confortable with overclocking, so it is not meant to encourage anyone to do the same. It just works for me. - This machine is used mainly for 3D rendering, parallel video encoding, video editing, not chess. So please do not ask me for benchmarks about Deep Shredder, Junior or whatever, as I do not have these programs. I simply ran Crafty 20.0 benchmarks (Bryan Hofmann executables). Here are the results @ 2442 MHz : XP 32 bit - 1 thread -------------------- Total nodes: 78314335 Raw nodes per second: 1779871 Total elapsed time: 44 SMP time-to-ply measurement: 14.545455 XP 64 bit - 1 thread -------------------- Total nodes: 78314335 Raw nodes per second: 2373161 Total elapsed time: 33 SMP time-to-ply measurement: 19.393939 XP 32 bit - 4 threads --------------------- Total nodes: 85233086 Raw nodes per second: 6556391 Total elapsed time: 13 SMP time-to-ply measurement: 49.230769 XP 64 bit - 4 threads --------------------- Total nodes: 86517348 Raw nodes per second: 8651734 Total elapsed time: 10 SMP time-to-ply measurement: 64.000000 NUMA is active and correctly recognized : 'Initializing multiple threads. System is NUMA. 2 nodes reported by Windows Node 0 CPUs: 0 1 Node 1 CPUs: 2 3 Current ideal CPU is 1'
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