Memory Speed Issue

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DigitalCyclone@1444151548

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Jul 20, 2013
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I have 2x sticks of this ram here:

http://www.amazon.com/gp/product/B0090UEASE/ref=oh_details_o09_s01_i02?ie=UTF8&psc=1

Here is the CPU-Z dump:

Memory Type DDR3
Memory Size 16 GBytes
Channels Dual
Memory Frequency 1199.8 MHz (1:9)
CAS# latency (CL) 10.0
RAS# to CAS# delay (tRCD) 12
RAS# Precharge (tRP) 12
Cycle Time (tRAS) 31
Row Refresh Cycle Time (tRFC) 313
Command Rate (CR) 2T
Uncore Frequency 3899.1 MHz
MCHBAR I/O Base address 0x0FED10000
MCHBAR I/O Size 19456
MCHBAR registers

Memory SPD
-------------------------------------------------------------------------

DIMM # 1
SMBus address 0x51
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Corsair (7F7F9E0000000000)
Size 8192 MBytes
Max bandwidth PC3-10700 (667 MHz)
Part number CMD16GX3M2A2400C10
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 6.0-6-6-17-22 @ 457 MHz
JEDEC #2 7.0-7-7-20-26 @ 533 MHz
JEDEC #3 9.0-9-9-25-33 @ 685 MHz
XMP profile XMP-2400
Specification PC3-19200
Voltage level 1.650 Volts
Min Cycle time 0.833 ns (1200 MHz)
Max CL 10.0
Min tRP 9.96 ns
Min tRCD 9.96 ns
Min tWR 15.00 ns
Min tRAS 25.75 ns
Min tRC 50.63 ns
Min tRFC 260.00 ns
Min tRTP 7.50 ns
Min tRRD 7.50 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 6.0-8-8-19-37-2T @ 722 MHz (1.650 Volts)
XMP #2 10.0-12-12-32-61-2T @ 1204 MHz (1.650 Volts)

DIMM # 2
SMBus address 0x53
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Corsair (7F7F9E0000000000)
Size 8192 MBytes
Max bandwidth PC3-10700 (667 MHz)
Part number CMD16GX3M2A2400C10
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 6.0-6-6-17-22 @ 457 MHz
JEDEC #2 7.0-7-7-20-26 @ 533 MHz
JEDEC #3 9.0-9-9-25-33 @ 685 MHz
XMP profile XMP-2400
Specification PC3-19200
Voltage level 1.650 Volts
Min Cycle time 0.833 ns (1200 MHz)
Max CL 10.0
Min tRP 9.96 ns
Min tRCD 9.96 ns
Min tWR 15.00 ns
Min tRAS 25.75 ns
Min tRC 50.63 ns
Min tRFC 260.00 ns
Min tRTP 7.50 ns
Min tRRD 7.50 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 6.0-8-8-19-37-2T @ 722 MHz (1.650 Volts)
XMP #2 10.0-12-12-32-61-2T @ 1204 MHz (1.650 Volts)


Is my RAM running correctly? Are the timings correct? Why does it show my max bandwidth (under the SPD section) as 667 mhz? I have my BIOS running "manual" instead of "XMP" and have the DRAM Frequency set to 2400 mhz.

Thank you for your help. I really appreciate it.
 
Solution
drtweak
Thats normal. Thats the base frequency of the Ram. Remember the ram works in a Tick Tock pattern. The DDR stands for Double Data Rate which means in one cycle it can get two bits of data VS the old SDR (Single Data Rate) which only gets one bit per cycle.

So you take that Base clock and multiply it by 2 and you get the speed its actually running at.

Now that section where you are reading the 667 thats actually the max STOCK speed of motherboard will take (1333) BUT if you look at the top it says its running at 1199 which lets just say is 1200 and times that by 2 and you get your 2400 mhz ram

All motherboards have max stock. Now its 1600 with the 3rd and 4th gen intels and if you want any faster you have to manually overclock your...
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drtweak

drtweak

Illustrious
Sep 17, 2012
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Thats normal. Thats the base frequency of the Ram. Remember the ram works in a Tick Tock pattern. The DDR stands for Double Data Rate which means in one cycle it can get two bits of data VS the old SDR (Single Data Rate) which only gets one bit per cycle.

So you take that Base clock and multiply it by 2 and you get the speed its actually running at.

Now that section where you are reading the 667 thats actually the max STOCK speed of motherboard will take (1333) BUT if you look at the top it says its running at 1199 which lets just say is 1200 and times that by 2 and you get your 2400 mhz ram

All motherboards have max stock. Now its 1600 with the 3rd and 4th gen intels and if you want any faster you have to manually overclock your memory.

Hope that helps!
 
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Solution
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DigitalCyclone@1444151548

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Jul 20, 2013
16
0
10,520
Thank you for the clear and concise reply. I'm running a Z87 Pro board, is it already outdated - why no support for 1600, etc? So, because a stock speed of 1333 is supported, is that all I'm getting out of my RAM? That is, is that extra wiggle room above and beyond 1333 simply not being utilized?

I'm sure this is a beginner question, but I appreciate your help!
 
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