Thank you for your reply.
By "South Bridge Chipset drivers", are you referring to
kjhosein wrote:I hit jackpot!!I had a hunch that the hard drive was the bottleneck, so I ran HD Tune and found that I was barely getting above 2MB/s transfer speeds. Well that's the problem right there! A quick check in the BIOS showed that there was nothing that could be adjusted there for the HD speed, so it had to be something to do with the OS. Could it really be drivers missing? Sure enough, after installing the South Bridge Chipset drivers from support.dell.com, my 320 was running like a cheetah.I also can't believe this was the solution. How come these drivers weren't pre-installed with the OS?? Anyway, sometimes the simple questions are the ones you should ask first.
danmb wrote:I don't understand. Dell is replacing the motherboard??? Did they say why? Is this a general fault with all Optiplex 320's, or just yours? It's very unusual for Dell to just up and change a motherboard like that.... My system is just out of warranty (by about a month)... The only way I would get a motherboard replaced is if Dell admitted to a defect..
It was the video card driver!!!!
I had suspected it early on. Don't use the ATI driver on the Dell web site. Instead go to ATI and get the drivers for the Radeon Xpress 1100 there: http://ati.amd.com/support/driver.HTML . It's listed under Integrated/Motherboard.
Be sure to remove the existing driver first - there should be an ATI removal tool listed in Add/Remove programs. Then reboot and allow it to detect the hardware, then reboot again, then install the new ATI driver.
The difference in performance is absolutely amazing.