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2133MHz DDR3 showing as 1280MHz on o/c'd i7-4930K


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I have an i7-4930K overclocked to 4.33GHz.  In AIDA64, the DDR3 speed is showing as 1280MHz (the system has 2133MHz installed).  At first I thought it might just be a similar thing to CPU-Z where the speed shown must be doubled for dual-channel DDR3, but other example systems in the attached are listed with correct speeds.


Is this a problem with my system that needs to be put right (I didn't do the overclock - the system builders did, so I'd need to contact them because I'm a bit of a tech chump), or a misreading or other oddity that I can ignore?  Many thanks in advance.




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BCLK Frequency is 159.97MHz (verified in BIOS)

CPU Core multipliers are all set at 27 (verified in BIOS)


Other details from CPU-Z in the attached CPU image - they seem to accord with entries I could see in the BIOS.


DRAM details I've included in the attached from CPU-Z which also seem to match the entries in the BIOS as far as I can see (BIOS n00b at large!)  CPU-Z also seems to be reporting an odd MHz (it's certainly not 2133MHz halved).  I removed the modules and checked their part numbers online - they're definitely 2133MHz modules.




A few other numbers from CPU-Z.....


ACPI timer 3.580 MHz
HPET timer 14.318 MHz
Perf timer 4.219 MHz
Sys timer 1.000 KHz
Processors Information
Number of cores 6 (max 16)
Number of threads 12 (max 32)
Name Intel Core i7 4930K
Codename Ivy Bridge-E
Specification Intel® Core i7-4930K CPU @ 3.40GHz
Package (platform ID) Socket 2011 LGA (0x2)
Extended CPUID 6.3E
Core Stepping S0/S1
Technology 22 nm
TDP Limit 130 Watts
Tjmax 95.0 °C
Core Speed 4319.2 MHz
Multiplier x Bus Speed 27.0 x 160.0 MHz
Rated Bus speed 5119.0 MHz
Stock frequency 3400 MHz
Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, EM64T, VT-x, AES, AVX
L1 Data cache 6 x 32 KBytes, 8-way set associative, 64-byte line size
L1 Instruction cache 6 x 32 KBytes, 8-way set associative, 64-byte line size
L2 cache 6 x 256 KBytes, 8-way set associative, 64-byte line size
L3 cache 12 MBytes, 16-way set associative, 64-byte line size
FID/VID Control yes
Turbo Mode supported, disabled
Max non-turbo ratio 27x
Max turbo ratio 39x
Max efficiency ratio 12x
Min Power 60 Watts
O/C bins unlimited
Ratio 1 core 39x
Ratio 2 cores 37x
Ratio 3 cores 37x
Ratio 4 cores 37x
Ratio 5 cores 36x
Ratio 6 cores 36x
Ratio 7 cores 36x
Ratio 8 cores 36x
TSC 4319.8 MHz
APERF 4319.8 MHz
MPERF 4319.8 MHz
DIMM (numbers from 2nd module)
SMBus address 0x54
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Kingston (7F980000000000000000)
Size 8192 MBytes
Max bandwidth PC3-10700 (667 MHz)
Part number KHX2133C11D3/8GX  
Serial number 6C1BDB52
Manufacturing date Week 20/Year 14
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.3
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-17-23 @ 457 MHz
JEDEC #2 7.0-7-7-20-27 @ 533 MHz
JEDEC #3 8.0-8-8-22-30 @ 609 MHz
JEDEC #4 9.0-9-9-24-33 @ 666 MHz
XMP profile XMP-2132
Specification PC3-17100
Voltage level 1.600 Volts
Min Cycle time 0.938 ns (1066 MHz)
Max CL 11.0
Min tRP 10.31 ns
Min tRCD 11.25 ns
Min tWR 15.00 ns
Min tRAS 28.13 ns
Min tRC 45.00 ns
Min tRFC 260.00 ns
Min tRTP 7.50 ns
Min tRRD 6.56 ns
Command Rate 1T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 6.0-7-6-17-27-1T @ 581 MHz (1.600 Volts)
XMP #2 7.0-8-8-20-31-1T @ 678 MHz (1.600 Volts)
XMP #3 8.0-9-8-22-35-1T @ 775 MHz (1.600 Volts)
XMP #4 9.0-10-9-25-40-1T @ 872 MHz (1.600 Volts)
XMP #5 10.0-11-10-28-44-1T @ 969 MHz (1.600 Volts)
XMP #6 11.0-12-11-30-48-1T @ 1066 MHz (1.600 Volts)
XMP #7 12.0-12-11-30-48-1T @ 1066 MHz (1.600 Volts)
XMP #8 13.0-12-11-30-48-1T @ 1066 MHz (1.600 Volts)
XMP #9 14.0-12-11-30-48-1T @ 1066 MHz (1.600 Volts)
XMP #10 15.0-12-11-30-48-1T @ 1066 MHz (1.600 Volts)
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.500 Volts
Min Cycle time 1.250 ns (800 MHz)
Max CL 9.0
Min tRP 11.25 ns
Min tRCD 11.25 ns
Min tWR 15.00 ns
Min tRAS 33.75 ns
Min tRC 45.00 ns
Min tRFC 260.00 ns
Min tRTP 7.50 ns
Min tRRD 6.00 ns
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 6.0-6-6-18-24-n.a @ 533 MHz (1.500 Volts)
XMP #2 7.0-7-7-21-28-n.a @ 622 MHz (1.500 Volts)
XMP #3 8.0-8-8-24-32-n.a @ 711 MHz (1.500 Volts)
XMP #4 9.0-9-9-27-36-n.a @ 800 MHz (1.500 Volts)


Is this sufficient?  Let me know what else if not.  


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