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No Dual Channel

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March 14, 2012 3:03:48 PM

ASUS M4A88T-M/USB3, 2X 2GB GSkill 1866 @ 1600, 965BE, everything set to auto. Will not boot in dual channel mode with the two sticks of RAM in the blue or the black slots. System used to be stable. Then started locking up. Now it won't boot. ANY MEM OK light stays on. Pushing the button does nothing. System will work with one stick in the first black and first blue slot running in single channel. RAM passed Windows Mem Diag Extended and several passes of Memtest86. I'm thinking it's the mobo. Any thoughts?

More about : dual channel

a c 347 } Memory
March 14, 2012 3:15:03 PM

Well first you've been lucky running you Phenom II X4 965 @ DDR3-1600 without FSB -> 240MHz or CPU-NB Frequency -> 2400MHz.

Sometimes ASUS screws-up reading 'SPD' when set to Auto. Trying to hope it's a matter of BIOS if you post a link to your "2X 2GB GSkill 1866" or better a screen shot of the 'SPD' tab or JEDEC timing/volatge data from the about (TXT)-- I'll post some choices and manual settings to try.

Running DDR3-1866 on a 4-core Phenom II X4 is dicey at best, so I'll post for DDR3-1333 and DDR3-1600 as proper configurations.
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March 14, 2012 3:24:45 PM

it doesnt work because your putting the sticks in the wrong slots. use the first and third or the second and forth. the same color slots wont work.
asus does this alot
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a c 347 } Memory
March 14, 2012 3:40:38 PM

I think the OP is using the correct DIMM slots "two sticks of RAM in the blue or the black slots", if the OP said AND vs (or) then that would be another issue as you stated.
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March 14, 2012 3:56:23 PM

i read the manual. he is using the wrong ones.

edit: added plural
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a c 347 } Memory
March 14, 2012 4:42:41 PM

The OP has one set 2x2GB, either the Blue (preferred) or Black slots work as Dual Channel:

CPU: | blank | blank | 2GB | 2GB | ; or
CPU: | 2GB | 2GB | blank | blank |

if 2 kits for Dual Channel:

CPU: | 2GB | 2GB | 2GB | 2GB | ; 8GB
CPU: | 4GB | 4GB | 2GB | 2GB | ; 12GB
CPU: | 4GB | 4GB | 4GB | 4GB | ; 16GB

CPU: | A2 | B2 | A1 | B1 |

I don't know what you're reading?!

---

You suggested:
CPU: | blank | 2GB | blank | 2GB | - this is wrong and not Dual Channel - I wasted my time looking at the manual.

Channel 0 is A and Channel 1 is A, in order to have 'Dual Channel' equal sizes per Channel 0 & 1 must be filled with any of the above (5) ways I posted.
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a c 347 } Memory
March 14, 2012 6:48:03 PM

Yeah, one stick needs to be in the (A) and one in (B); Dual Channel = A1+B1, or A2+B2, or (A1+A2) + (A2+B2). Both Channels must be equal in size.

What I post above is indeed 100% correct, I have ZERO doubts.
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a b } Memory
March 14, 2012 8:05:18 PM

mem ok light stay on in user manual page 1-28 means memory is not properly installed ,so use user manual they tell you how to resolve this
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March 16, 2012 5:06:23 AM

farrengottu said:
there is another thread here on tomshardware that covers this problem.
http://www.tomshardware.com/forum/297538-30-asus-m4a88t...
you have to set your timings manually.

Thanks for the input. The two blue slots are the preferred slots per the manual. My system used to run fine with them there @ 1600. Now it will only boot with one stick in the first black and first blue which is single channel.
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March 16, 2012 5:08:32 AM

jaquith said:
Well first you've been lucky running you Phenom II X4 965 @ DDR3-1600 without FSB -> 240MHz or CPU-NB Frequency -> 2400MHz.

Sometimes ASUS screws-up reading 'SPD' when set to Auto. Trying to hope it's a matter of BIOS if you post a link to your "2X 2GB GSkill 1866" or better a screen shot of the 'SPD' tab or JEDEC timing/volatge data from the about (TXT)-- I'll post some choices and manual settings to try.

Running DDR3-1866 on a 4-core Phenom II X4 is dicey at best, so I'll post for DDR3-1333 and DDR3-1600 as proper configurations.


They auto detected at 1600. It's also one of the choices in the BIOS. Be that as it may, I've tried everything, including changing to 1333 in the BIOS before moving back to the blue slots.
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a c 347 } Memory
March 16, 2012 10:50:36 AM

Under CPU-z what are the CAS timings and voltage for 667MHz and 800MHz? If you post the numbers, lets try to set the RAM manually.

The only way for the RAM to run @ DDR3-1600 is to either set them manually in the BIOS or to be running some BIOS invasive application e.g. AMD OverDrive Utility, or ASUS Ai Suite, etc ... uninstall them for now and IMO permanently; they cause more issues then they solve and OC'ing is dirt simple.
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