dimension 9200 copy slow from internal drives to USB after upgrading ram from 1gb to 3gb. At first I thought it was the ram that I added so change it and even WENT ahead and install a fresh windows but problem seems not to be solved.What is speed in MB/sec?
When the copy start, the speed is between 6MB/sec to 10MB/sec depending on the usb device then reduces gradually to 3MB if I'm not copying anything. The worse is, at 3MB/sec, the copying is not continues copying, it stops and continue occasionally which makes copying really boring. At a point in time I was advice to use tera copy but I got the same result.What drive is the destination? Flash? Hard drive? Mp3 player? What are you copying - few large files or MANY small files? Is destination drive NEARLY full?

For destination drives I've not tried Mp3 but flash drive and Hard drive, yes. And as for the copying problem it happens to both few large files and small files but when copying between internal drives the copying speed is between 20MB/sec to 50MB/secHave you tried all USB ports on the PC? Speeds are typical for flash drives. Possibly USB controller is faulty.
I use and recommend TeraCopy...Free.

It copy's/moves much faster than ths BUILT in Windows tool.the speed of the usb ports are all the same, both on the front and at back. I wonder why addition of ram has reduce my speed so drastically because at the time I was using 1gb ram the copy was was so fast.when I'm copying to external hard disk the speed is between 13MB/sec to 16MB/sec. Does it still mean that my usb port are not good.What type of hard drive is installed, SATA, IDE/ATA? Did you checked the DMA or PIO mode(if available) in your device manager? The setting should be in DMA or Direct Memory Access. However, some flash drives have lower transfer rate compared to hard drives.My computer only supports SATA. Yesterday when I went home I install fresh windows 7 on my computer and it seems like the transfer rate has decrease again because at first it use to start from 8MB/sec and gradually it drops to 3MB/sec but after setting fresh windows yesterday the transfer rate starts from 3MB/sec. SINCE I upgraded my memory I have set two fresh windows on my computer and all seems to reduce the transfer rate. I will check the DMA.