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Help: Upgrading RAM from 8 GB to 24 GB
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<blockquote data-quote="plat" data-source="post: 913425" data-attributes="member: 74969"><p>The timings are different. If you search the specifications using the SKUs you provided, the 4GB modules are 9-9-9-24 and the 8GB are 10-10-10-27. The voltages are the same, however, (1.5 v) as is the speed of 1600mHz and the form factor of DDR3 but that doesn't guarantee the RAMs will all run together in perfect harmony. </p><p></p><p>To be conservative and safe, try running just the two matched 8 GB modules in slots A1 and B1--(black slots) and then check Task Manager/Performance/Memory to make certain Windows is seeing both. . If you want to add the 2X4GB and you then have a POST problem you can be pretty sure it's the RAM. If the machine does boot properly, you again can use Task Manager/Performance/Memory to check which slots are recognized by Windows. You can also check the BIOS settings.</p></blockquote><p></p>
[QUOTE="plat, post: 913425, member: 74969"] The timings are different. If you search the specifications using the SKUs you provided, the 4GB modules are 9-9-9-24 and the 8GB are 10-10-10-27. The voltages are the same, however, (1.5 v) as is the speed of 1600mHz and the form factor of DDR3 but that doesn't guarantee the RAMs will all run together in perfect harmony. To be conservative and safe, try running just the two matched 8 GB modules in slots A1 and B1--(black slots) and then check Task Manager/Performance/Memory to make certain Windows is seeing both. . If you want to add the 2X4GB and you then have a POST problem you can be pretty sure it's the RAM. If the machine does boot properly, you again can use Task Manager/Performance/Memory to check which slots are recognized by Windows. You can also check the BIOS settings. [/QUOTE]
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