I think what is messing us up here is our understanding of how the memory works.
Also, remember that the memory controller is built into the Core i7 processor instead of being separately on the motherboard.
When I run CPU-Z, I get the same readings you got.
The rated frequency of the memory sticks, I not sure, but at a guess, it appears this is done by multiplying, in other words, the
Timing - notice readings on the Memory tab under Timings. FSB : DRAM 2:8 and the other settings use like 8 Clocks and 19 Clocks.
Also notice the FB Frequency 2133 MHz
It appears there are a lot of variables here.
So like you, I would need to see an explanation of how this works to achieve the 10666 MHz rating
You might want to stop by the Corsair Forums and post a question to Ram Guy about this to see if you can get an explanation of
how it works and what's what. I'd be very interested to see the results myself so I can better understand this myself instead of
guessing as to how it works.
http://www.asktheramguy.com/forums/tags.php?tag=i7
OKays my turn to chime in, the reason you all can't get faster speed out of the RAM is that the base core i7 920 and 940 only support the 533 MHz at max, the Extreme Edition can use my OCZ3 Triple channel 1600 MHz RAM to the fullest, yet the latency increases.
If your going to upgrade the RAM run CPU-Z and check the RAM timing, mine with the stock timing was 7-7-7-20, i.e. CL7 memory you will want to get memory with those timings. However, I decided for the faster RAM cause I am tempted to remove the motherboard and processor, but anyways, when I got my 12800 RAM, the system clocked it down in MHz to the systems max at 533 MHz, yet the clocks stayed the same at 7 7 7 but the cycle time actually increased to 18 clocks... so it reads 7 - 7 - 7 - 18 with a command rate of 2T.
not sure what the command rate is for, but that it for you...
I wouldn't recommend any one getting the corsair RAM as it will either keep you at 7-7-7-20 or knock you down to 7 -7 -7-19... the closer to 1 you are the better. so get the OCZ 1 clock = nanoseconds I think in the long run but it helps it be a bit more efficient.
As for the FSB : DRAM ratio of 2:8 or 1:4 depending on how you want to see it, that is something you can't change on this system, but for the over clockers out there you will want to try to get the ratio as close to 1:1 as possible for the most speed possible. Yet from my experience in researching about my future motherboard and core i7 extreme edition purchases, I can say that the 2:8 increases with the core i7 extreme, to 2:12. That isn't good it means the RAM is way faster than the processor can probably handle, and you loose efficiency. but then that was an over clocked system.
Also for those that buy the DDR3 RAM, for best results buy the RAM in packs of 3 for triple channel, don't go out and buy 3 packs of dual channel, that can cause problems. Instead, buy 2 packs of triple channel. It helps. As of yet I haven't seen any other RAM get faster than my OCZ RAM.
You can find my RAM here...
http://www.compusa.com/applications/SearchTools/item-details.asp?EdpNo=4282839&CatId=4329
It's OCZ Gold Tri Channel 6GB PC12800 DDR3 Memory - 1600MHz, 6GB (3x2GB)
You can also see that as I was mentioning that the Core i7 920 only supports the 533 MHz ram here... http://ark.intel.com/cpu.aspx?groupID=37147&code=Intel®+Core™+i7-920+Processor+(8M+Cache,+2.66+GHz,+4.80+GT/s+Intel®+QPI)
Please note, all DDR<anything> is double pumped so that means take the 1600MHz / 2 and you have what CPU-Z would tell you my speed is if the processor was able to be over clocked on this board. So take you 533MHz it reads and multiply it by 2 and you will have 1066 RAM which as it says "Memory Types DDR3-800/1066" quoted from the site above, is all that the system can support at max.
For the core i7 940 = http://ark.intel.com/cpu.aspx?groupID=37148&code=Intel®+Core™+i7-940+Processor+(8M+Cache,+2.93+GHz,+4.80+GT/s+Intel®+QPI)
It is the same way...
so too is the core i7 965 extreme, yet since you can over clock you can achieve faster memory speeds, all be it at reduced efficiency. http://ark.intel.com/cpu.aspx?groupID=37149&code=Intel®+Core™+i7-965+Processor+Extreme+Edition+(8M+Cache,+3.20+GHz,+6.40+GT/s+Intel®+QPI)
Note that efficiency of the processor is more important to real world applications than the super speeds you can possibly achieve with Ci7.