The W2000 W4000 & W5000 support up to 2GBx2=4GB max, if you need upgrade to 4GB memory, and following items for your refrence: 1. Get compatible DRAM from list http://wss.thecus.com/sp_compatibility.php -> W4000 -> Memory Compatibility List -> http://www.thecus.com/download/compatibility/memory/Thecus_Memory_list.pdf 2. If you unable to get the DRAM from listed, but you have other 2GB DDR3 SO-DIMM available, please doing following DRAM compatibility test at least for 48 hours. http://esupport.thecus.com/Knowledgebase/Article/View/214/0/usb-boot--memtest86 3. Check enclose file abuout W2000 & W4000 DRAM assemble guide. The W5000 just need loose 3 back panel screws to revmoce back panel, and take the top cover out then able to add the DRAM.
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