Memory clock 667mhz instead of 1600 (1t)

Chernabog · Feb 18, 2014

Hi everyone!
I recently built a pc and I got curious about my old pc specs (it was not built by me, a year and a half ago). So I downloaded cpu-z

And It turns out my ram (CMZ8GX3M2A1866C9) runs at 667mhz with 1t, here is cpu-z's result

DIMM # 1
SMBus address 0x50
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Corsair (7F7F9E0000000000)
Size 4096 MBytes
Max bandwidth PC3-10700H (667 MHz)
Part number CMZ8GX3M2A1866C9
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-16-23 @ 444 MHz
JEDEC #2 7.0-7-7-19-27 @ 518 MHz
JEDEC #3 8.0-8-8-22-30 @ 592 MHz
JEDEC #4 9.0-9-9-24-34 @ 666 MHz
XMP profile XMP-1866
Specification PC3-14900
Voltage level 1.500 Volts
Min Cycle time 1.071 ns (933 MHz)
Max CL 9.0
Min tRP 9.64 ns
Min tRCD 10.71 ns
Min tWR 15.00 ns
Min tRAS 28.93 ns
Min tRC 50.64 ns
Min tRFC 160.00 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 6.0-7-6-18-32-2T @ 622 MHz (1.500 Volts)
XMP #2 9.0-10-9-27-48-2T @ 933 MHz (1.500 Volts)

DIMM # 2
SMBus address 0x52
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Corsair (7F7F9E0000000000)
Size 4096 MBytes
Max bandwidth PC3-10700H (667 MHz)
Part number CMZ8GX3M2A1866C9
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-16-23 @ 444 MHz
JEDEC #2 7.0-7-7-19-27 @ 518 MHz
JEDEC #3 8.0-8-8-22-30 @ 592 MHz
JEDEC #4 9.0-9-9-24-34 @ 666 MHz
XMP profile XMP-1866
Specification PC3-14900
Voltage level 1.500 Volts
Min Cycle time 1.071 ns (933 MHz)
Max CL 9.0
Min tRP 9.64 ns
Min tRCD 10.71 ns
Min tWR 15.00 ns
Min tRAS 28.93 ns
Min tRC 50.64 ns
Min tRFC 160.00 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 6.0-7-6-18-32-2T @ 622 MHz (1.500 Volts)
XMP #2 9.0-10-9-27-48-2T @ 933 MHz (1.500 Volts)

Can I just tweak it from the BIOS and enable XMP?

My motherboard is an Asrock H77 Pro4/MVP
Also, that guy plugged the cpu fan on a CHA_FAN pin. Ridiculous.

Thanks in advance!

ewok93 · Feb 18, 2014

RAM does tune itself down on occasion, just to save heat and power. That's what it looks like to me, considering it also says it's at 933mhz near the bottom. Check what its at under load, if it's at 667mhz just go into your BIOS and turn it up. Also, plugging a CPU fan into a chassis fan is perfectly fine, unless it's a 4 pin connect only plugged into a 3 pin.

Chernabog · Feb 18, 2014

Okay, I followed your advice and cpu-z was still saying ~667 under heavy load.

I accessed the bios, DRAM speed was set to auto. THe problem is I only have 2 other options

1066
1333

I chose 1333 for now, but cpu-z still says ~667

Any clue?
Can I enable xmp on this board?

edit: attached cpu-z screcrenren. doit manuly change voltage?

Pinhedd · Feb 18, 2014

Chernabog :

Hi everyone!
I recently built a pc and I got curious about my old pc specs (it was not built by me, a year and a half ago). So I downloaded cpu-z

And It turns out my ram (CMZ8GX3M2A1866C9) runs at 667mhz with 1t, here is cpu-z's result

DIMM # 1
SMBus address 0x50
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Corsair (7F7F9E0000000000)
Size 4096 MBytes
Max bandwidth PC3-10700H (667 MHz)
Part number CMZ8GX3M2A1866C9
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-16-23 @ 444 MHz
JEDEC #2 7.0-7-7-19-27 @ 518 MHz
JEDEC #3 8.0-8-8-22-30 @ 592 MHz
JEDEC #4 9.0-9-9-24-34 @ 666 MHz
XMP profile XMP-1866
Specification PC3-14900
Voltage level 1.500 Volts
Min Cycle time 1.071 ns (933 MHz)
Max CL 9.0
Min tRP 9.64 ns
Min tRCD 10.71 ns
Min tWR 15.00 ns
Min tRAS 28.93 ns
Min tRC 50.64 ns
Min tRFC 160.00 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 6.0-7-6-18-32-2T @ 622 MHz (1.500 Volts)
XMP #2 9.0-10-9-27-48-2T @ 933 MHz (1.500 Volts)

DIMM # 2
SMBus address 0x52
Memory type DDR3
Module format UDIMM
Manufacturer (ID) Corsair (7F7F9E0000000000)
Size 4096 MBytes
Max bandwidth PC3-10700H (667 MHz)
Part number CMZ8GX3M2A1866C9
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 6.0-6-6-16-23 @ 444 MHz
JEDEC #2 7.0-7-7-19-27 @ 518 MHz
JEDEC #3 8.0-8-8-22-30 @ 592 MHz
JEDEC #4 9.0-9-9-24-34 @ 666 MHz
XMP profile XMP-1866
Specification PC3-14900
Voltage level 1.500 Volts
Min Cycle time 1.071 ns (933 MHz)
Max CL 9.0
Min tRP 9.64 ns
Min tRCD 10.71 ns
Min tWR 15.00 ns
Min tRAS 28.93 ns
Min tRC 50.64 ns
Min tRFC 160.00 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 6.0-7-6-18-32-2T @ 622 MHz (1.500 Volts)
XMP #2 9.0-10-9-27-48-2T @ 933 MHz (1.500 Volts)

Can I just tweak it from the BIOS and enable XMP?

My motherboard is an Asrock H77 Pro4/MVP
Also, that guy plugged the cpu fan on a CHA_FAN pin. Ridiculous.

Thanks in advance!

Enabling XMP is what you want to do.

By default the system firmware will select the highest commonly supported JEDEC profile contained within the memory module's SPDs. Notice that there are 4 JEDEC profiles (this is common) and two XMP profiles (also common).

The highest JEDEC profile is 666Mhz which corresponds to DDR3-1333. If you want to run the desired DDR3-1866 which has a 933Mhz reference clock, just enable the second XMP profile and cross your fingers.

Tradesman1 · Feb 18, 2014

What does it show in the Memory tab, the SPD tab simply shows info from the SPD, whatever it shows in the memory tab by Frequency is what it's running at, and you take that freq times 2 to find your effective since this is DDR (DOUBLE data rate) - it will also show you what timings and CR you are actually running at. What CPU do you have

Chernabog · Feb 19, 2014

Thanks everyone,

CPU is Intel i5 2500. Now, CR seems to be 1, should I set it manually to 2?

Sorry for the dumb questions, I am not really into hardware tweaking!

Pinhedd · Feb 19, 2014

Chernabog :

XMP will take care of that for you

Chernabog · Feb 19, 2014

The problem is I have no XMP in my BIOS. THe manual mentions it

ftp://europe.asrock.com/manual/H77%20Pro4MVP.pdf

BUt as you can see yourself is nowhere on screen. No "LOad XMP profile" option there. I manually set CR to 2 and cpu-z now shows 2t as multiplier. I guess that's what I was looking for, correct? I'm talking about the memory tab.

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Memory clock 667mhz instead of 1600 (1t)

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