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RAM displaying different CAS in each slot

Last response: in Memory
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January 25, 2013 5:09:16 PM

Hey guys here are the specs of my computer:

OS: Windows 7 Home Premium SP1 64bit
CPU: Intel Core i5-3570K @ 3.40GHz 3.80GHz
MoBo: GIGABYTE GA-Z77X-UP4 TH
Memory: 8.00 GB (2x4) Patriot Memory - Viper DDR3 @ 1600MHz
GPU: NVIDIA GeForce GTX 660
PSU: CORSAIR CX600 600W ATX12V v2.3
Case: NZXT Phantom 410 (white)
Cooling: COOLER MASTER Hyper 212 EVO
SSD: Samsung SSD 850 PRO Seri
HDD: ST31000524AS

My situation is that I'm testing my RAM in Memtest86. In Dual Channel the CAS are reading 9-9-9-24 which is normal and recommended for my modules. However when I test one stick in each slot I'm getting:

DDR3_1: 6-6-6-20
DDR3_3: 6-6-6-20
DDR3_2: 9-9-9-24
DDR3_4: 9-9-9-24

I tested both sticks individually with same results on each and if I dual channel in (_1 and _2) or (_3 and _4) I get the normal 9-9-9-24. So when testing them individually and getting the above results-- is that normal or should I manually change the CAS for _1 and _3 to read 9-9-9-24?

There are no errors found on my sticks according to Memtest86.
a b } Memory
January 26, 2013 1:48:20 AM

Slot 1and slot 3 have a common memory controller. You can change the timings yourself in bios or just enable XMP. If there are no problems I'd say leave the settings as they are.
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a c 128 } Memory
January 26, 2013 2:11:30 AM

teapo said:
Hey guys here are the specs of my computer:

OS: Windows 7 Home Premium SP1 64bit
CPU: Intel Core i5-3570K @ 3.40GHz 3.80GHz
MoBo: GIGABYTE GA-Z77X-UP4 TH
Memory: 8.00 GB (2x4) Patriot Memory - Viper DDR3 @ 1600MHz
GPU: NVIDIA GeForce GTX 660
PSU: CORSAIR CX600 600W ATX12V v2.3
Case: NZXT Phantom 410 (white)
Cooling: COOLER MASTER Hyper 212 EVO
SSD: Samsung SSD 850 PRO Seri
HDD: ST31000524AS

My situation is that I'm testing my RAM in Memtest86. In Dual Channel the CAS are reading 9-9-9-24 which is normal and recommended for my modules. However when I test one stick in each slot I'm getting:

DDR3_1: 6-6-6-20
DDR3_3: 6-6-6-20
DDR3_2: 9-9-9-24
DDR3_4: 9-9-9-24

I tested both sticks individually with same results on each and if I dual channel in (_1 and _2) or (_3 and _4) I get the normal 9-9-9-24. So when testing them individually and getting the above results-- is that normal or should I manually change the CAS for _1 and _3 to read 9-9-9-24?

There are no errors found on my sticks according to Memtest86.


Most memory modules have multiple standard memory profiles on them for automatic configuration. If you have high performance memory modules you may have extra 'XMP' profiles which have to be enabled manually.

It looks to me like your memory modules may come from different sets with different defaults. If they work at the specified 9-9-9-24 @ DDR3-1600 when grouped then there's nothing to worry about. Timings of 6-6-6-20 are most likely found on DDR3-1066 or DDR3-1333 which are automatic default profiles.
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January 26, 2013 2:26:35 AM

Thanks for the feedback guys. Was worried that something in my hardware may have been causing some of my BSODs but I've done a clean install on Win7 just an hour ago so I will see now if any of my problems will persist.
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a c 128 } Memory
January 26, 2013 2:31:19 AM

teapo said:
Thanks for the feedback guys. Was worried that something in my hardware may have been causing some of my BSODs but I've done a clean install on Win7 just an hour ago so I will see now if any of my problems will persist.


Mixed memory kits can sometimes cause that. Use CPU-Z to check the model of your memory kits and make sure that they are the same. This may also explain the different timings.
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January 26, 2013 3:16:41 AM

Thank you Pinhedd. The RAM I am using is from the same package so they should be the same model. I don't think my issues have been solved as I got another BSOD lol.

If you're interested in the main thread-- it's on sevenforums

http://www.sevenforums.com/crashes-debugging/275401-bso...
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a c 128 } Memory
January 26, 2013 5:09:02 AM

If you haven't done so already, update your motherboard firmware to the latest revision. Sometimes firmwares incorrectly calculate secondary and tertiary SDRAM timings for some modules.
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January 26, 2013 5:23:18 AM

Yes, my BIOS firmware is up to date. That was actually one of first things I concluded to doing when starting to experience such problems.
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a c 128 } Memory
January 26, 2013 7:15:39 AM

teapo said:
Yes, my BIOS firmware is up to date. That was actually one of first things I concluded to doing when starting to experience such problems.


Could be a bad memory module. MemTest86 tests for errors but it doesn't load the memory down. Try running Prime95 on blend mode and see if the frequency of failures increases.
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