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Same modules, different SPDs


Rafal

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I bought two 8Gig sets CMX8GX3M2A1600C9 from Newegg in a matter of couple weeks. The 2nd set is showing lower SPD values and system is unstable (locks up overnight).

Please see attached Memtest86 and CPU-Z below:

Memory SPD

-------------------------------------------------------------------------

 

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 CMX8GX3M2A1600C9

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 6.0-6-6-16-23 @ 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-1600

Specification PC3-12800

Voltage level 1.650 Volts

Min Cycle time 1.250 ns (800 MHz)

Min tRP 11.25 ns

Min tRCD 11.25 ns

Min tWR 15.00 ns

Min tRAS 30.00 ns

Min tRC 50.63 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 6.0-6-6-16-27-2T @ 533 MHz (1.650 Volts)

XMP #2 9.0-9-9-24-41-2T @ 800 MHz (1.650 Volts)

 

DIMM # 2

SMBus address 0x51

Memory type DDR3

Module format UDIMM

Manufacturer (ID) Corsair (7F7F9E0000000000)

Size 4096 MBytes

Max bandwidth PC3-8500F (533 MHz)

Part number CMX8GX3M2A1600C9

Manufacturing date Week 22/Year 10

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 6.0-6-6-18-24 @ 457 MHz

JEDEC #2 7.0-7-7-20-27 @ 533 MHz

JEDEC #3 8.0-8-8-23-31 @ 609 MHz

JEDEC #4 9.0-9-9-26-35 @ 685 MHz

XMP profile XMP-1600

Specification PC3-12800E

Voltage level 1.650 Volts

Min Cycle time 1.250 ns (800 MHz)

Min tRP 11.25 ns

Min tRCD 11.25 ns

Min tWR 15.00 ns

Min tRAS 30.00 ns

Min tRC 50.63 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 6.0-6-6-16-27-2T @ 533 MHz (1.650 Volts)

XMP #2 9.0-9-9-24-41-2T @ 800 MHz (1.650 Volts)

 

DIMM # 3

SMBus address 0x52

Memory type DDR3

Module format UDIMM

Manufacturer (ID) Corsair (7F7F9E0000000000)

Size 4096 MBytes

Max bandwidth PC3-10700H (667 MHz)

Part number CMX8GX3M2A1600C9

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 6.0-6-6-16-23 @ 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-1600

Specification PC3-12800

Voltage level 1.650 Volts

Min Cycle time 1.250 ns (800 MHz)

Min tRP 11.25 ns

Min tRCD 11.25 ns

Min tWR 15.00 ns

Min tRAS 30.00 ns

Min tRC 50.63 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 6.0-6-6-16-27-2T @ 533 MHz (1.650 Volts)

XMP #2 9.0-9-9-24-41-2T @ 800 MHz (1.650 Volts)

 

DIMM # 4

SMBus address 0x53

Memory type DDR3

Module format UDIMM

Manufacturer (ID) Corsair (7F7F9E0000000000)

Size 4096 MBytes

Max bandwidth PC3-8500F (533 MHz)

Part number CMX8GX3M2A1600C9

Manufacturing date Week 22/Year 10

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 6.0-6-6-18-24 @ 457 MHz

JEDEC #2 7.0-7-7-20-27 @ 533 MHz

JEDEC #3 8.0-8-8-23-31 @ 609 MHz

JEDEC #4 9.0-9-9-26-35 @ 685 MHz

XMP profile XMP-1600

Specification PC3-12800E

Voltage level 1.650 Volts

Min Cycle time 1.250 ns (800 MHz)

Min tRP 11.25 ns

Min tRCD 11.25 ns

Min tWR 15.00 ns

Min tRAS 30.00 ns

Min tRC 50.63 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 6.0-6-6-16-27-2T @ 533 MHz (1.650 Volts)

XMP #2 9.0-9-9-24-41-2T @ 800 MHz (1.650 Volts)

668137487_2011-02-1208_26_53.thumb.jpg.cba8186b411da48a05b859d3b79dfc20.jpg

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Wait a second!

Usually when I was buying a memory of a good brand with exactly the same part number and from the same, reputable source they were assumed THE SAME working at their SPD settings (I am not talking about any crazy overclock, you can check my first post).

Does it mean that Corsair sank low and I should not expect any consistency at stock speeds for this RAM? Or even the same SPDs?

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  • Corsair Employee

No that means that you should purchase a set as you plan to use them and not mix memory. IE if you want 16 Gig purchase a 16 Gig set. Mixing memory is hit and miss, sometimes it will work and sometimes it will not and there is not a lot we can do about it as we do not test sets with other sets so there is no way to make that promise.

We can replace the set or both sets but you may still have the same issue as we can only replace them for the same part number you send in.

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So are you trying to say, that when I buy RAM from Corsair I should not expect it will run at stock speeds per SPDs? I am definitely lost here. You could miss the fact, I am not complaining I can not overclock "balls to the wall" with this RAM but that it's not working at stock speeds per SPDs.

This discussion is really making me think Corsair does not care about their quality anymore....

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So are you trying to say, that when I buy RAM from Corsair I should not expect it will run at stock speeds per SPDs? I am definitely lost here. You could miss the fact, I am not complaining I can not overclock "balls to the wall" with this RAM but that it's not working at stock speeds per SPDs.

This discussion is really making me think Corsair does not care about their quality anymore....

 

This has NOTHING to do with quality. We can only make memory with what is available to us from the IC fabs. When they make changes, we make changes.

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SPD is only meant for initial booting, and XMP is meant for the rated product specs, but isn't meant for more than one kit (may work though). Either way you're mixing two kits that haven't been explicitly tested together and as such cannot be guaranteed to work together.

 

If XMP doesn't work, reset your BIOS, set the speed and timings manually. May have to underclock the memory a bit for stability if your memory controller can't handle 4 sticks at 1600 MHz and/or doesn't like mixing kits.

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Hmmm, you say nothing about quality? Guess what, I ditched this Corsair RAM and got a G-Skill. All working like a charm, everything running per SPD and I even got a shot at Asus's automatic overclocking with a 100% stability @ over 4300GHz and RAM at over 800 (still holding SPDs).

So my advice to people is simple, get G-Skill instead as Corsair disappoints.

And I am really not happy about...

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  • Corsair Employee
We are happy that you got your system up and running and am sorry that our memory did not work for you and wish you the best of luck. But its not fair to say that just because you had a bad experience the other 100+ thousand people this month who have had no problems made a mistake in their purchase.
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