Problem with dual channel memory (B75MA-P45)

Hello,
I can't make the dual channel memory working.
When I put DDR3 in slots 2 + 4 or slots 1 + 3 and even if all slots are installed with the same DIMM, it does not boot and restart in loop.
Currently, this mobo works with DDR3 in slots 1 + 2 (so without dual channel).
I have read posts about bent pins, therefore I inspected the CPU seating but nothing seems wrong.
My CPU has been recovered from a HP pavilion ; don't know whether it's important or not.
Hope someone has a tip for me.
My configuration:
Motherboard: B75MA-P45
CPU: i5-2320
Memory: tried several, finally tested 4 x 4GB Kingston PC3-10600 CL9 240 (KVR13N9S8/4)
Graphic card: Palit GeForce GTX-750 Ti

Thanks for your answers.
I'll try asap slots 3 & 4.
It's almost a new build (one month ago). The whole story is:
I bought the motherboard and two memory sticks of 2 and 4 GB DDR3 as I already had similar ones on my HP pavilion (but not exactly the same, not same brand). I expected to run on 12 GB dual channel memory. But the dual channel did not work at first try. After some additionnal testing, I tought it was because the sticks aren't compatible ones with others. So I purchased 3 sticks of Kingston 4 GB, exactly the same reference as one I already have.
Now, I'm pretty sure that this problem isn't related to memory sticks.
I already did a clear CMOS during installation for other reason but it didn't solve this problem.
Since, this PC works well with Win7. I tested it under considerable stress and it runs just fine.

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Todd,
Your last post help me understand your situation a bit better. Here are some questions for you:
1- On your old system did these memory sticks work fine has a dual channel pair? Were these 2 memory sticks bought has a dual channel rated matched pair?
2- In your own words give me your definition of POST?
3- In your own words give me your exact detailed rendition of what happens when you try to post with dual setup. (How far do you get? Where does it hang up?)
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Sorry for my English , English is my 3rd language
Anyway Thanking everyone that replies with an answer that is OnT....
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Quote from: Alex.Ethuba on 06-August-09, 02:27:46
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-Thank You
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hi bknoll,
welcome to the forum.
1) i wouldn't worry overmuch at the 201 issue.
2) Quote
I've ran memory test utilities. That had a good effect and the computer runs fairly stable, but I still have problems
which test utilities did you use, Don't quiet understand Quote
had a good effect and the computer runs fairly stable
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hi
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greetings faxe

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Quote
when i told him i had 2x sticks of 512 memory he told me that the mobo dont work well with dual channel
is nearly as good as:
Quote
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https://forum-en.msi.com/index.php?topic=94728.msg681427#msg681427
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Quote from: BOSSKILLER on 07-April-08, 23:55:36
Remove your OC then see how its goes.
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DUAL CHANNEL MEMORY

memory will only work in single channel memory.try to put in slot 2 screen is blank. how do i change it to dual channel.i look in bois no settings for this.
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This question was solved.
View Solution.

kuzz1999 wrote:
memory will only work in single channel memory.try to put in slot 2 screen is blank. how do i change it to dual channel.i look in bois no settings for this.
"try to put in slot 2 screen is blank." What exactly do you mean by that statement?
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Only purchase guaranteed compatible memory modules in pairs from online vendors and stores. Purchasing memory that is not guaranteed compatible is nothing less than taking a gamble with your money.
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

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Description: Panic (system crashes) log
Size: 6.14 KB
Last Modified: 4/9/07 7:25 PM
Location: /Library/Logs/panic.log
Recent Contents: ...
Proceeding back via exception chain:
Exception state (sv=0x505F1280)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x4F81E000)
PC=0x9003C0EC; MSR=0x0000F030; DAR=0xE0006000; DSISR=0x42000000; LR=0x00002FEC; R1=0xBFFFFD80; XCP=0x00000030 (0xC00 - System call)
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Darwin Kernel Version 8.9.0: Thu Feb 22 20:54:07 PST 2007; root:xnu-792.17.14~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
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0x000952D8 0x000957F0 0x00026898 0x000A8004 0x000AB980
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0x000EC65C 0x000E8E20 0x000EC6A8 0x002AB7F8 0x000ABB30 0xFFFFFFFF
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PC=0x9003C0EC; MSR=0x0000F030; DAR=0xE0006000; DSISR=0x42000000; LR=0x00002FEC; R1=0xBFFFFD80; XCP=0x00000030 (0xC00 - System call)
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Darwin Kernel Version 8.9.0: Thu Feb 22 20:54:07 PST 2007; root:xnu-792.17.14~1/RELEASE_PPC

645 ultra - Dual Channel Memory?

Just Finished Building my system about 2 weeks ago. I was wondering if the MS-6547 is capable of running memory in dual channel mode?
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Channel Watt Tech. 350w Power Supply
P4 Northwood 2.4(400FSB)@3200
1 Stick 512MB Kingston PC-2700 2-2-2-6 (ultra setting mode)
Western Digital 80GB 7200 RPM 8MB Cache
Sony CD/RW 52X
Samsung CD ROM 40X
Sound Blaster PCI512
GeForce MX/MX 400 (PCI Slot)
Yahama YST-MS50 (Powered Multi Media Speakers)
HP Deskjet 656C
Windows XP Pro SP-1

Following great advice from initial poster to this thread , I've finally managed an overclock my 645 ULTRA, it's only taken me a year
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Clean Boot,
Re-Set Ram CPU ratio down to give 266Mhz.
Turbo Ram Timing.
Ram Latency CL2
Ras/Cas Normal.
Al of which I was backing off, but rightn now seems to hold up
I was able to wind the FSB up to 118Mhz, clocking me at a mear 2.85 Gig (which for some reason is higher than 118*24)
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At 120 I got quite a lot of graphical artifacting, but my gcard was running hot since the air temp here is at about 25/26C with sumer approaching (don't help does it!)
Anyway, I'll be ticking off a few more tweaks tonight.
I did notice that this did NOT improve Aquamark, but added 1000 points to 3dMark2001, from taking it from 11500 to 12500. Benchmarks moving more from CPU/GPU to GPU only dependant. Codecreatures is a good bench also

Problem with dual channel memory (B75MA-P45)

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