Will this brand of third-party RAM work in my Mid 2010 iMac? I am looking to update my iMac's Mid 2010 RAM from 4GB to 12GB and wondering if this RAM is alright to use and what is the difference between the two sets of RAM because they are the same price, both for the iMac/Macbook Pro but have slightly different configurations.

http://www.scan.co.uk/products/8gb-(2x4gb)-corsair-apple-imac-macbook-macbook-pro-ddr3-so-dimm-pc3-10666-(1333)-non-ecc-unbuffered-

http://www.scan.co.uk/products/8gb-(2x4gb)-corsair-apple-macpro-ddr3-so-dimm-pc3-8500-(1066)-non-ecc-unbuffered-cas-7-7-7-20-150v

Using crucial.com, their system scanner tells me my system is a mid-2011 iMac even though I am 100% sure it is Mid-2010 because my system was bought in 2010 and says it in the system preferences. The scanner recommends http://www.crucial.com/uk/store/mpartspecs.aspx?mtbpoid=D7403679A5CA7304

System Info


iMac 21.5" Mid 2010
4GB 1333Mhz DDR3
ATI 5670 512MB
3.2 Intel Core i3
The iMac Mid-2010 supports DDR3 10666 (from the Apple support site)

The first link is to the correct RAM for that Front Side Bus (FSB) speed
The second link is to a slightly quicker set of RAM, but runs on a lower FSB.

The differences between the two are characterised by the two notes above, the FSB speed and the clock timings.

In the first, the FSB speed is higher, but the timings for the RAM are slower.  In the second, the slower FSB allows the RAM to work at slightly faster timings.

If you want to know about timings, a search for RAS CAS delay is a good starting point.