I recently ordered an additional pair of DIMMs to go with my older existing pair, making sure to get the same part number. However having installed them and dumped out the SPD info via CPUZ i discovered that there's quite a bit of difference between them.
Code:
Memory SPD
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DIMM # 1
SMBus address 0x50
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Kingston (7F980000000000000000)
Size 8192 MBytes
Max bandwidth PC3-12800 (800 MHz)
Part number KHX2133C11D3/8GX
Serial number 0F306AD6
Manufacturing date Week 17/Year 15
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 6.0-6-6-16-22 @ 457 MHz
JEDEC #2 7.0-7-7-19-26 @ 533 MHz
JEDEC #3 8.0-8-8-22-30 @ 609 MHz
JEDEC #4 9.0-9-9-24-33 @ 685 MHz
JEDEC #5 10.0-10-10-27-37 @ 761 MHz
JEDEC #6 11.0-11-11-28-39 @ 800 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 11.25 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 6.0-7-7-17-27-1T @ 581 MHz (1.600 Volts)
XMP #2 7.0-8-8-20-31-1T @ 678 MHz (1.600 Volts)
XMP #3 8.0-9-9-22-35-1T @ 775 MHz (1.600 Volts)
XMP #4 9.0-10-10-25-40-1T @ 872 MHz (1.600 Volts)
XMP #5 10.0-11-11-28-44-1T @ 969 MHz (1.600 Volts)
XMP #6 11.0-12-12-30-48-1T @ 1066 MHz (1.600 Volts)
XMP #7 12.0-12-12-30-48-1T @ 1066 MHz (1.600 Volts)
XMP #8 13.0-12-12-30-48-1T @ 1066 MHz (1.600 Volts)
XMP #9 14.0-12-12-30-48-1T @ 1066 MHz (1.600 Volts)
XMP #10 15.0-12-12-30-48-1T @ 1066 MHz (1.600 Volts)
XMP profile XMP-1600
Specification PC3-12800H
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)
DIMM # 2
SMBus address 0x51
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 680C15C8
Manufacturing date Week 19/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)