What is the smallest capacity DIMM supported in HP Z440, Z640, and Z840 workstations? 05/14/2017 – by Mod_GuideK 0 What is the smallest capacity DIMM supported in HP Z440, Z640, and Z840 workstations? A. 2MB B. 4MB C. 2GB D. 4GB SHOW ANSWERSCorrect Answer: D Explanation/Reference: Explanation: Download Printable PDF. VALID exam to help you PASS.