can i install different memory size in dell workstation 380

For best performance, memory should be installed in matched pairs. Your system has 4 memory slots, max of 2GB per slot, for a total max of 8GB. If you're running WinXP 32-bit & have no plans to upgrade to a 64-bit OS, there's no point installing more than 4GB. http://www.crucial.com/upgrade/Dell... http://support.dell.com/support/edo... http://support.dell.com/support/edo...

riider is correct in what he has posted above. You probably have a 512MB module currently installed. there is no 518MB. This is an excerpt from the link below. 533-MHz and 667-MHz ECC and non-ECC DDR2 SDRAM NOTE: Ensure that you do not mix ECC and non-ECC memory. Your specs state you are using 32 bit Windows so 4GB is the max. Use 2- 2 GB sticks. Remove the 512MB. Get the same speed and latency as installed if possible. Use the crucial.com online scan to determine what you have and what can work. http://support.dell.com/support/edo...

Thanks for the advice. I have 2 dells running Windows XP 32 bit. One of them has a single 2gig module, and the other has the single 512mg module. I just bought a new p.c. So I was planning on taking the 2 gb module out of one Dell and put in in the other for my 2nd p.c to consolidate them to have a second p.c. in a different part of the house. I checked on Crucial.com to see if this module is compatible with my workstation 380 which it is. I was just wondering if it would help speed it up, because it's running very slow.