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Apple Computing Products:
macOS - Desktop Hardware
memory upgrade
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<blockquote data-quote="wyattoons" data-source="post: 414477" data-attributes="member: 32609"><p>No. I mean, I'm sure it may work, but it isn't the way to go.</p><p></p><p>Keep the memory in balanced pairs. </p><p></p><p>Each riser has two channels running to the memory controller. Channel 0 is DIMM 1 and DIMM 3 on the top riser, Channel 1 is DIMM 2 and 4. You want these channels to match, the memory control wants these channels to match.</p><p></p><p>So, abc should put his new 1Gb DIMMs in Slots 1 and 2 on the top riser. Channel 0 will be 1GB+0GB=1GB, as will Channel 1. Matched!</p><p></p><p>Then abc will put the original 512Mb DIMMs in Slots 1 and 2 on the bottom riser. This turns on Channels 2 and 3, taking advantage of the Mac Pro's quad channel memory controller. Channels 2 and 3 should be balanced like 0 and 1 above. </p><p></p><p>abc, by using both risers, you are taking advantage of all four channels, which is (on paper) faster than just loading up one riser and only using two channels. Plus, DIMMs 1 and 2 on each riser connect directly to the high-speed bus, DIMMs 3 and 4 routed through DIMMs 1 and 2 first.</p><p></p><p>abc, how can tripling your RAM slow the system? There may be more optimum combination of chip types and sizes, but all of that is inconsequential compared to the boost you'll get from having more RAM. </p><p></p><p>Personally, I would buy from someone who gives a warranty and will be easy to reach if there are problems. Crucial is tops. OWC is lower cost, yet reputable. I find it hard to believe Optival has come up with a way to make their memory 30% faster without any competing product from the larger dealer\rs.</p></blockquote><p></p>
[QUOTE="wyattoons, post: 414477, member: 32609"] No. I mean, I'm sure it may work, but it isn't the way to go. Keep the memory in balanced pairs. Each riser has two channels running to the memory controller. Channel 0 is DIMM 1 and DIMM 3 on the top riser, Channel 1 is DIMM 2 and 4. You want these channels to match, the memory control wants these channels to match. So, abc should put his new 1Gb DIMMs in Slots 1 and 2 on the top riser. Channel 0 will be 1GB+0GB=1GB, as will Channel 1. Matched! Then abc will put the original 512Mb DIMMs in Slots 1 and 2 on the bottom riser. This turns on Channels 2 and 3, taking advantage of the Mac Pro's quad channel memory controller. Channels 2 and 3 should be balanced like 0 and 1 above. abc, by using both risers, you are taking advantage of all four channels, which is (on paper) faster than just loading up one riser and only using two channels. Plus, DIMMs 1 and 2 on each riser connect directly to the high-speed bus, DIMMs 3 and 4 routed through DIMMs 1 and 2 first. abc, how can tripling your RAM slow the system? There may be more optimum combination of chip types and sizes, but all of that is inconsequential compared to the boost you'll get from having more RAM. Personally, I would buy from someone who gives a warranty and will be easy to reach if there are problems. Crucial is tops. OWC is lower cost, yet reputable. I find it hard to believe Optival has come up with a way to make their memory 30% faster without any competing product from the larger dealer\rs. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
memory upgrade
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