I’m sure when i bought them they were advertised as 1333Mhz but today when i checked my system information through Speccy i found it was only working with 666mhz speed..This is what i got-
Your data rate (clock speed) in Speccy or CPU-Z is listed as 666MHz which is correct…however you are using Double Data Rate ram…you must multiply that 666 by 2x which would be 1332 or for general purposes 1333 MHz so yes your ram IS 1333…the 9-9-9-24 is the timing..or the speed of the clock cycles. most often its only concerned with the first number…9…which indicates C9 timing….standard for 1333 ram. The less cycle rate, the faster you access data so C8 timing is faster than C9 timing. Your mother board is capable of 1800MHz ram at 8-8-8-27 timing. To acheeve that speed you would have to change the ram an then go into the bios and “tweak” the speed to 1800 and the timing to 8-8-8-27 (Your Speccy would show it as 900MHz!)
1333mhz is the effective clock rate. DDR means double data rate, data is transfered on both the rising and falling edges of each clock making 666mhz effectively the same as 1333. Speccy is showing you the actual clock rate. There is nothing wrong.
9-9-9-24 is the delay between certain memory operations(measured in clocks). lower numbers are better, but they are also relative to clock rate. 9-9-9-24 is a little slow for 1333mhz, but you should not try changing it as it can lead to system instability.
I’d say that the ram is either mixed brands or noncompatible timing thus forcing a lower rate of speed. Although you have 1333mhz, the timing plays an inegral part as to whewther you get the full speed.
“2 x240-pin DIMM, Max. 8 GB, DDR3 1333(O.C.)/1066/800 Non-ECC,Un-buffered Memory
Dual Channel memory architecture
*When installing total memory of 4GB capacity or more, Windows® 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended. ”
Nothing is wrong with it bc as stated in ur question ddr 666 mhz, ddr= double data rate meaning that what ur frequency reading on them is you double it..so 666mhz really is 1333mhz…hope that made sense:)
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you need to over-clock it to get to the 1600Mhz
Warning: satan in haunting your computer.