Rafal Posted February 12, 2011 Share Posted February 12, 2011 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) Link to comment Share on other sites More sharing options...
Wired Posted February 12, 2011 Share Posted February 12, 2011 Most likely if you check the version number on the label they'll be different versions. Link to comment Share on other sites More sharing options...
Rafal Posted February 15, 2011 Author Share Posted February 15, 2011 OK, let me think.... I bought a set of RAM and then I get another with IDENTICAL part number. Then I look into operational settings and the newest set works below specs by SPDs. Something is seriously wrong here. Link to comment Share on other sites More sharing options...
Wired Posted February 15, 2011 Share Posted February 15, 2011 What is the version number of each kit? How To Read the Memory Label Link to comment Share on other sites More sharing options...
Rafal Posted February 15, 2011 Author Share Posted February 15, 2011 2x - CMX8GX3M2A1600C9 ver5.11 - 11034179 2x - CMX8GX3M2A1600C9 ver5.11 - 10521770 As you can see from Memtest screen I attached one works as PC3-8500 and the other PC3-10600. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted February 17, 2011 Corsair Employee Share Posted February 17, 2011 With two sets of mixed memory I would suggest setting the memory frequency at DDR1333. Link to comment Share on other sites More sharing options...
Rafal Posted February 18, 2011 Author Share Posted February 18, 2011 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? Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted February 18, 2011 Corsair Employee Share Posted February 18, 2011 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. Link to comment Share on other sites More sharing options...
Rafal Posted February 19, 2011 Author Share Posted February 19, 2011 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.... Link to comment Share on other sites More sharing options...
Yellowbeard Posted February 19, 2011 Share Posted February 19, 2011 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. Link to comment Share on other sites More sharing options...
Wired Posted February 19, 2011 Share Posted February 19, 2011 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. Link to comment Share on other sites More sharing options...
Rafal Posted February 25, 2011 Author Share Posted February 25, 2011 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... Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted February 26, 2011 Corsair Employee Share Posted February 26, 2011 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. Link to comment Share on other sites More sharing options...
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