CPU-Z reporting to different pc3 memory

[mach1korea]

When I run CPU-Z it report that slot 1 & 2 are running PC-12800 and slot 3 & 4 are running PC3-10700.
Below is the info from the txt file, I'm confused!!

Memory SPD
-------------------------------------------------------------------------
DIMM # 1
SMBus address 0x50
Memory type DDR3
Module format UDIMM
Manufacturer (ID) G.Skill (7F7F7F7FCD000000)
Size 2048 MBytes
Max bandwidth PC3-12800H (800 MHz)
Part number F3-12800CL9-2GBNQ
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 7.0-7-7-22-29 @ 622 MHz
JEDEC #2 8.0-8-8-25-33 @ 711 MHz
JEDEC #3 9.0-9-9-28-37 @ 800 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.500 Volts
Min Cycle time 1.250 ns (800 MHz)
Min tRP 11.00 ns
Min tRCD 11.00 ns
Min tWR 15.00 ns
Min tRAS 30.00 ns
Min tRC 42.50 ns
Min tRFC 160.13 ns
Min tRTP 7.50 ns
Min tRRD 6.00 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 9.0-9-9-25-35-2T @ 818 MHz (1.500 Volts)
DIMM # 2
SMBus address 0x51
Memory type DDR3
Module format UDIMM
Manufacturer (ID) G.Skill (7F7F7F7FCD000000)
Size 2048 MBytes
Max bandwidth PC3-12800H (800 MHz)
Part number F3-12800CL9-2GBNQ
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 7.0-7-7-22-29 @ 622 MHz
JEDEC #2 8.0-8-8-25-33 @ 711 MHz
JEDEC #3 9.0-9-9-28-37 @ 800 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.500 Volts
Min Cycle time 1.250 ns (800 MHz)
Min tRP 11.00 ns
Min tRCD 11.00 ns
Min tWR 15.00 ns
Min tRAS 30.00 ns
Min tRC 42.50 ns
Min tRFC 160.13 ns
Min tRTP 7.50 ns
Min tRRD 6.00 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 9.0-9-9-25-35-2T @ 818 MHz (1.500 Volts)
DIMM # 3
SMBus address 0x52
Memory type DDR3
Module format UDIMM
Manufacturer (ID) G.Skill (7F7F7F7FCD000000)
Size 2048 MBytes
Max bandwidth PC3-10700 (667 MHz)
Part number F3-12800CL9-2GBNQ
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
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 8.0-8-8-22-31 @ 609 MHz
JEDEC #4 9.0-9-9-25-34 @ 685 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.500 Volts
Min Cycle time 1.250 ns (800 MHz)
Min tRP 10.88 ns
Min tRCD 10.88 ns
Min tWR 15.00 ns
Min tRAS 29.63 ns
Min tRC 40.88 ns
Min tRFC 110.00 ns
Min tRTP 7.50 ns
Min tRRD 6.00 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 9.0-9-9-25-34-2T @ 827 MHz (1.500 Volts)
DIMM # 4
SMBus address 0x53
Memory type DDR3
Module format UDIMM
Manufacturer (ID) G.Skill (7F7F7F7FCD000000)
Size 2048 MBytes
Max bandwidth PC3-10700 (667 MHz)
Part number F3-12800CL9-2GBNQ
Number of banks 8
Nominal Voltage 1.50 Volts
EPP no
XMP yes
XMP revision 1.2
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 8.0-8-8-22-31 @ 609 MHz
JEDEC #4 9.0-9-9-25-34 @ 685 MHz
XMP profile XMP-1600
Specification PC3-12800
Voltage level 1.500 Volts
Min Cycle time 1.250 ns (800 MHz)
Min tRP 10.88 ns
Min tRCD 10.88 ns
Min tWR 15.00 ns
Min tRAS 29.63 ns
Min tRC 40.88 ns
Min tRFC 110.00 ns
Min tRTP 7.50 ns
Min tRRD 6.00 ns
Command Rate 2T
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 9.0-9-9-25-34-2T @ 827 MHz (1.500 Volts)

[parsec]

Well, given the JEDEC timing values of all the DIMMs, that all have the same part number, DIMMs 1 and 2 match timings, and DIMMs 3 and 4 match timings.

But the JEDEC and XMP timings of DIMMs 1 and 2 do not match the JEDEC and XMP timings of DIMMs 3 and 4! Also, the Max Bandwidth specs of 1 and 2 does not match the Max Bandwidth spec of 3 and 4.

So there are several possibilities here.

If this was a matched set of four DIMMs, all in one package, then G.SKILL packaged them wrong.

If this is two packages of two matched DIMMs, then G.SKILL has changed the specs of this memory between the time you bought the first set of two, and the second set of two.

If you bought them at the same time, you received two different versions of the same part number.

Your board is faithfully running those DIMMs with the different timing information programmed into them, which is interesting, I've never seen that happen. I assume since they are in different channels, each channel can operate at different speeds independently. If you mixed those DIMMs, one of each set in each channel, they would probably run at the lower speed, but might run at the higher speed if you were lucky.

How did you get these identical yet different DIMMs?

[mach1korea]

there not a matched set of 4 bought 1 month apart from the same supplier. I will try mix and match see if that does anything

[profJim]

It looks like G.Skill programmed the SPD values differently with your second memory kit.
This might be an error on G.Skill's part or they might have a batch of memory that is mislabeled.
Some motherboards support different memory settings for each memory channel.
In G.SKILL- F3-12800CL9D-4GBNQ memory, your motherboard is not listed in their Qualified Motherboards List.
Their online ram configurator provides a list of recommended memory kits for you motherboard G.SKILL- memory search: ASRock 990FX Extreme4

See if you can exchange both memory kits with a matched set of one of the recommended/tested memory models.

[parsec]

"Some motherboards support different memory settings for each memory channel."

Really, what is the point of that? To combine different types of memory?

There's all kinds of differences in those DIMMs besides timing data, one set has:

Min Cycle time 1.250 ns (800 MHz)
Min tRP 11.00 ns
Min tRCD 11.00 ns
Min tWR 15.00 ns
Min tRAS 30.00 ns
Min tRC 42.50 ns
Min tRFC 160.13 ns
Min tRTP 7.50 ns
Min tRRD 6.00 ns

The other:

Min Cycle time 1.250 ns (800 MHz)
Min tRP 10.88 ns
Min tRCD 10.88 ns
Min tWR 15.00 ns
Min tRAS 29.63 ns
Min tRC 40.88 ns
Min tRFC 110.00 ns
Min tRTP 7.50 ns
Min tRRD 6.00 ns

We're talking nanoseconds, and fractions of them at that, but the tRFC of 160.13ns in one and 110.00ns in the other could be significant.

I just remembered my X58 mother board uses G.SKILL GBNQ memory, 6 x 2GB DIMMs at 1600, 9 9 9 24 1T. I mixed two, three channel DIMM sets, and they worked fine.

Prof. Jim may be right about the JEDEC and XMP data being programmed wrong on one of those sets.

G.SKILL usually puts the date of manufacture on the label on the DIMMs, my GBNQs have that. You could check if they are far apart in time of manufacture.

If they don't work for you and really are the same part number, I'm sure G.SKILL will RMA your sets and send you matched ones.

[mach1korea]

I see what you mean but on the Asrock web site they say they are OK ASRock > 990FX Extreme4

[profJim]

It looks like ASRock tested the memory with your motherboard and G.Skill did not.
The bottom line is that you currently have mismatched memory kits that might lead to lower performance and/or stability issues.
You paid good money for your memory and you shouldn't have to deal with these potential problems.

I never buy memory that is on the motherboard support list as the list is often a small sample of all the memory models in the market.
I always check with the memory manufacturer's tech support to verify which of their kits has been tested with my motherboard.

[mach1korea]

Over the weekend I played mix and match with them, and found that the new set even a single module would only run at PC3-10700. I will be contacting the supplier today and get exchange.

[mach1korea]

played around the weekend and found the new set would only work as PC3-10700 even in single channel mode. I will be contacting supplier today.

[parsec]

Did you try changing the speed of your memory, or is that the default, automatic speed?

As I said I use that model of memory, in an Intel X58 board. Notice the memory has an XMP profile, an Intel memory feature. Now I know memory can be used in Intel or AMD boards, at least in the past, but recently they tend to be more specific about the chipset and CPU manufacture. It seems to me a bit of a stretch to use memory that works in an Intel board with the memory controller on the CPU, and also on AMD hardware.

I would contact G.SKILL, and see what their support people suggest for your board.

Prof. Jim, although your technique of matching memory to a mother board works apparently for you, I don't trust ALL memory manufactures to have competent personnel available to answer questions. Given how many times I have had memory that the manufacture said would work in a certain platform just flat out fail, I live by the QVL list. I may be missing things here, but it has saved me a lot of time and grief, since in my experience, the QVL is always right.