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Apple Computing Products:
macOS - Desktop Hardware
memory compatibility
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<blockquote data-quote="pm-r" data-source="post: 1798404" data-attributes="member: 175845"><p>Actually, often if you ordered the faster RAM several years ago from most good RAM dealers, you would often receive the faster backward compatible chip modules as they were usually cheaper and the older chips were out of production. I would imagine that the situation is still similar if not more so.</p><p></p><p>I have had such modules working in some of our Macs for years now, and they works just fine. Even when installed as mixed speeds.</p><p></p><p>BTW: Using this 2009 iMac as a typical example you can see where it says:</p><p><em><strong>RAM Type: PC3-8500 DDR3 <strong>Min. RAM Speed: 1066 MHz</strong></strong></em></p><p><em><strong>Details: Supports 1066 MHz PC3-8500 DDR3 SO-DIMMs (204-pin).</strong></em></p><p></p><p></p><p>Notice it says: <em><strong><u>Min. RAM Speed</u></strong></em>: <em>1066 MHz</em></p><p></p><p>I'd say you're good to go and I'd be very surprised if those 1333MHz 204 pin RAM modules didn't work in your 2009 iMac.</p><p></p><p>And good thinking BTW, to install and utilize the removed modules.</p><p></p><p></p><p></p><p></p><p></p><p></p><p></p><p></p><p>- Patrick</p><p>======</p></blockquote><p></p>
[QUOTE="pm-r, post: 1798404, member: 175845"] Actually, often if you ordered the faster RAM several years ago from most good RAM dealers, you would often receive the faster backward compatible chip modules as they were usually cheaper and the older chips were out of production. I would imagine that the situation is still similar if not more so. I have had such modules working in some of our Macs for years now, and they works just fine. Even when installed as mixed speeds. BTW: Using this 2009 iMac as a typical example you can see where it says: [I][B]RAM Type: PC3-8500 DDR3 [B]Min. RAM Speed: 1066 MHz[/B] Details: Supports 1066 MHz PC3-8500 DDR3 SO-DIMMs (204-pin).[/B][/I] Notice it says: [I][B][U]Min. RAM Speed[/U][/B][/I]: [I]1066 MHz[/I] I'd say you're good to go and I'd be very surprised if those 1333MHz 204 pin RAM modules didn't work in your 2009 iMac. And good thinking BTW, to install and utilize the removed modules. - Patrick ====== [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
memory compatibility
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