Intel is correct.
I have two Dell Dimesion 4550s still running fine with 2GB ram. Not sure of the difference between them and the 4500 but as I recall, they are essentially the same.
Here's a guy who has 2GB on your 4500 machine.
http://en.community.dell.com/dell-groups/new-to-community/f/3511/p/19265414/19453532.aspx#19453532
And here's where I found I could do it on my 4550s.
http://en.community.dell.com/support-forums/desktop/w/desktop/dimension-4550-2gb-memory-yes.aspx
That resondent to the 4550 question on the above forum said you had to flash the BIOS to a later version. Well, I did not, I still run A05 BIOS, and everything has been fine since I added the extra memory several years ago.
I used Crucial memory in my boxes.
Hope this helps.
- "Observe and learn from the mistakes of others, so others don't get to learn from yours."
- "Skeptics are seldom deceived."