Comments on: Is it possible to use DDR3-1333 RAM with the 27″ iMac Core i5 and Core i7? http://timon-royer.com/en/52/is-it-possible-to-use-ddr3-1333-ram-with-the-27-imac-core-i5-and-core-i7/ Wed, 02 Nov 2011 17:14:41 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: TR http://timon-royer.com/en/52/is-it-possible-to-use-ddr3-1333-ram-with-the-27-imac-core-i5-and-core-i7/comment-page-1/#comment-508 TR Wed, 02 Nov 2011 17:14:41 +0000 http://timon-royer.com/en/?p=52#comment-508 Maybe to many devices on that specific WiFi channel? Hard to say. A known problem with 10.7 Lion is that Wifi doesn't come back after returning from sleep mode. Same is true for the ethernet connection in case of my late 2009 iMac. Maybe to many devices on that specific WiFi channel? Hard to say. A known problem with 10.7 Lion is that Wifi doesn’t come back after returning from sleep mode. Same is true for the ethernet connection in case of my late 2009 iMac.

]]> By: Eric http://timon-royer.com/en/52/is-it-possible-to-use-ddr3-1333-ram-with-the-27-imac-core-i5-and-core-i7/comment-page-1/#comment-507 Eric Wed, 02 Nov 2011 17:08:04 +0000 http://timon-royer.com/en/?p=52#comment-507 I am running 4x4gb of PC3-10600 CL9 204-Pin SoSimm in my Late 2009 iMac 27" i7 2.83ghz quad core and have no problems except the fact that my wifi sometimes loses signal and I have to switch off the airport and then switch it back on. Any ideas as to why this may be happening? I am running 4x4gb of PC3-10600 CL9 204-Pin SoSimm in my Late 2009 iMac 27″ i7 2.83ghz quad core and have no problems except the fact that my wifi sometimes loses signal and I have to switch off the airport and then switch it back on. Any ideas as to why this may be happening?

]]> By: RAmBoy http://timon-royer.com/en/52/is-it-possible-to-use-ddr3-1333-ram-with-the-27-imac-core-i5-and-core-i7/comment-page-1/#comment-199 RAmBoy Fri, 19 Nov 2010 20:56:55 +0000 http://timon-royer.com/en/?p=52#comment-199 I have 16GB of 1333Mhz 9.9.9.24 in my late 2009 iMac. (Mushkin) No problem. I have 16GB of 1333Mhz 9.9.9.24 in my late 2009 iMac. (Mushkin)
No problem.

]]> By: Alejandro http://timon-royer.com/en/52/is-it-possible-to-use-ddr3-1333-ram-with-the-27-imac-core-i5-and-core-i7/comment-page-1/#comment-95 Alejandro Wed, 30 Dec 2009 15:08:02 +0000 http://timon-royer.com/en/?p=52#comment-95 Nick, can you post what kind of Ram have you installed? (Brand, latencies, amount -modules and size-...) and... have you removed the "old" 1066Mhz modules provided with your iMac, or are they mixed 1066 and 1333? Thankyou in advance Nick, can you post what kind of Ram have you installed? (Brand, latencies, amount -modules and size-…)

and…
have you removed the “old” 1066Mhz modules provided with your iMac, or are they mixed 1066 and 1333?

Thankyou in advance

]]> By: Nick http://timon-royer.com/en/52/is-it-possible-to-use-ddr3-1333-ram-with-the-27-imac-core-i5-and-core-i7/comment-page-1/#comment-79 Nick Mon, 14 Dec 2009 21:03:51 +0000 http://timon-royer.com/en/?p=52#comment-79 Just as a data point, I just installed 8gb HyperX 1333 ram in my iMac i7 and got the following scores in GB: overall 9843 memory 5409 Just as a data point, I just installed 8gb HyperX 1333 ram in my iMac i7 and got the following scores in GB: overall 9843 memory 5409

]]> By: OhBoy http://timon-royer.com/en/52/is-it-possible-to-use-ddr3-1333-ram-with-the-27-imac-core-i5-and-core-i7/comment-page-1/#comment-64 OhBoy Tue, 08 Dec 2009 03:22:38 +0000 http://timon-royer.com/en/?p=52#comment-64 Just a clarification of CL ratings. 1333MHz CL7 is NOT the same timing as 1066MHz CL7. There is more to this topic than I will mention here. I think you can get the idea of what I am saying though. CL stands for Column Address Strobe Latency. SDRAM latency is measured in operational cycles not milliseconds. The memory bus expects the RAM to respond on time. In the case of 1066MHz CL7 RAM this would mean the RAM would reply in (approx) 0.000000006566604 seconds. The 1333MHz CL9 RAM would take (approx) 0.000000006751688 seconds to respond. This is too much delay to operate correctly. 1333MHz CL8 should be fine with a delay of (approx) 0.0000000060015 seconds. 1333MHz CL7 would have a delay of (approx) 0.000000005251313 seconds. There is more to this topic that you can read about online. Just a clarification of CL ratings. 1333MHz CL7 is NOT the same timing as 1066MHz CL7.
There is more to this topic than I will mention here. I think you can get the idea of what I am saying though.
CL stands for Column Address Strobe Latency. SDRAM latency is measured in operational cycles not milliseconds. The memory bus expects the RAM to respond on time.
In the case of 1066MHz CL7 RAM this would mean the RAM would reply in (approx) 0.000000006566604 seconds. The 1333MHz CL9 RAM would take (approx) 0.000000006751688 seconds to respond. This is too much delay to operate correctly. 1333MHz CL8 should be fine with a delay of (approx) 0.0000000060015 seconds. 1333MHz CL7 would have a delay of (approx) 0.000000005251313 seconds. There is more to this topic that you can read about online.

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