On Dec 9, 2011, at 8:37 AM, Bruce Godfrey wrote: > > Disk Speed Bench X reported the following this morning: > ATA 100 drive mounted as /Volumes/MDD HD1 77 MB/sec > SCSI drive mounted as / 76MB/sec No difference between IDE and SCSI speeds > according to this test. >
This means your disk I/O is not what's constraining your system. A faster disk did not increase your actual trabsfer rates, so it's a bus limit, not a disk IO limit. > > Xbench results when the MDD was booted from the faster ATA100 drive: > > Memory Test 37.05 System 34.46 Allocate > 94.16 345.79 Kalloc/sec > > Xbench results when the MDD was booted from the SCSI drive running on a UL3D > card: > > Memory Test 40.85 System 40.53 Allocate > 111.12 408.06 Kalloc/sec What this mainly means is that XBench is significantly non-precise, that it is designed for systems much faster than the MDD you tested it on, or that your system is seriously memory-bound. Disk speed should have no bearing whatsoever on memory or system test values, as these tests shouldn't be touching the disks at all. -- Bruce Johnson University of Arizona College of Pharmacy Information Technology Group Institutions do not have opinions, merely customs -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g3-5-list
