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if you're looking for speed... then find a 1600 module with the lowest CAS latency. &nbsp;<br />
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<a href="http://en.wikipedia.org/wiki/CAS_latency" rel="ugc">http://en.wikipedia.org/wiki/CAS_latency</a><br />
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IMO CAS latency makes a bigger difference than a couple mhz in clockrate
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if you're looking for speed... then find a 1600 module with the lowest CAS latency.  

http://en.wikipedia.org/wiki/CAS_latency [http://en.wikipedia.org/wiki/CAS_latency]

IMO CAS latency makes a bigger difference than a couple mhz in clockrate

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Also, DDR3-12800 modules are going to be easier to find and thus get a better deal on.<br />
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<a href="http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007611%20600006127%20600006156&IsNodeId=1&name=7" rel="ugc">http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007611%20600006127%20600006156&IsNodeId=1&name=7</a><br />
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7 CAS is going to be the shortest latency on that memory spec
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Also, DDR3-12800 modules are going to be easier to find and thus get a better deal on.

http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007611%20600006127%20600006156&IsNodeId=1&name=7 [http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007611%20600006127%20600006156&IsNodeId=1&name=7]

7 CAS is going to be the shortest latency on that memory spec

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Wasn't looking for recommendations on performance, but the fact of function vs fail. &nbsp;More research looks like the CPU can communicate at the higher speeds, but not required. &nbsp;I will soon find out. &nbsp;Thanks to everyone for their input.
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Wasn't looking for recommendations on performance, but the fact of function vs fail.  More research looks like the CPU can communicate at the higher speeds, but not required.  I will soon find out.  Thanks to everyone for their input.

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Going to be running Windows 7 Home 64-bit. &nbsp;Mobo lists DDR3-1600 as top option, but CPU spec shows DDR3-1866. &nbsp;Asus shows the CPU is compatible with this mobo. &nbsp;Looking at systems on the market, they are using DDR3-1600. &nbsp;Thoughts?
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Going to be running Windows 7 Home 64-bit.  Mobo lists DDR3-1600 as top option, but CPU spec shows DDR3-1866.  Asus shows the CPU is compatible with this mobo.  Looking at systems on the market, they are using DDR3-1600.  Thoughts?

Recommendations on RAM with A8-5500 and Asus A85XM-A

A desktop computer is a personal computer designed for use at a single location due to its size and power requirements, usually by one person. The most common configuration has a case that houses the power supply, motherboard, disk storage (usually one or more hard disk drives and optical disc drives); a keyboard and mouse for input; and computer monitor and printer for output. The case may be oriented horizontally and placed atop a desk or vertically and placed underneath or beside a desk.