I've built a workstation for a Structural Engineering Company to be used primarily for running 3D CAD software. This system uses a Pentium D 960 processor, 2Gb DDR2 533MHz, SATA HDD, nVidia Quadro FX1500 PCI Express graphics and Gigabyte motherboard.
Once we have the right specification, I need to build five more to replace their existing 3 year old PCs. These used P4 800MHz 3.06GHz cpus, 1Gb DDR400, SATA HDD, NVidia Quadra AGP x8 and Gigabyte GA-8KNXP motherboard.
If I run a benchtest the new PC is much faster, but if a small or large design is rendered in their CAD software it is 8% slower than two of the older ones we had available to test.
I wondered if it is the fact that the software benefits from Hyper Threading found on the older PCs and not on the basic dual core, only on the Extremes. Are there any known issues with CAD packages and dual core processors?
The only other thing I can think that may affect performance is that, the PC was required as an urgent replacement and I had to use a micro 775-pin motherboard with onboard VGA. This does have a PCI Express slot for the nVidia card and takes DDR2 memory, but the three year old GA-8KNXP motherboard used on the old systems were very advanced at the time supporting Hyper Threading, etc.
Any ideas would be appreciated.