Your Dell Inspiron 7000 D266GT/D266XT can support up to 384 MB w/128 (non-removable) of memory. For optimal system performance install the maximum amount of memory in each memory socket, this system comes with standard amount of   32,64 or 128 MB (non-removable) + 64 MB (removable) RAM. One or more of the sockets in the system might be already filled with memory. Whenever you upgrade, you can either add memory to one of the open sockets and/or remove memory from a filled socket and replace it with a higher capacity memory module. Select your Memory Upgrade for Dell Inspiron 7000 D266GT/D266XT.