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DDR3 1333 RAM not always detected after Processor upgrade

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  • G.SKILL
  • RAM
  • Processors
  • Memory
Last response: in Memory
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November 25, 2012 5:34:20 AM

Hello everyone,
So here is the situation. I have a system which I have been slowly upgrading piece by piece over the last one year or so. Current specs.

1. CPU: AMD FX 4100
2. RAM: 2x4GB G.SKILL F3-10666CL9-4GBNT (9-9-9-24 1.5v)
3. MOBO: Gigabyte GA-78LMT-S2P
4. PSU: Corsair GS600
5. GPU: GTX 550Ti
6. OS: Win 7 Ultimate 64bits
Note: NO OVERCLOCK, everything is stock

Now here is the problem. Previously, I was using the AMD Athlon X2 CPU and everything else was the same specs. I never faced any issues or problems with my system. Recently, I got the FX 4100, installed it and that when the problem started. Windows detected only 6GB of RAM with 4GB usable. So I immediately rebooted and alas the bios only read 4097 MB of DDR3 at 1333MHz. Windows loaded and again only 6GB. No change after several reboots. I was getting sure I had fried a stick.

So, next these are what I try
I remove both sticks and reseat them - No change (By the way my mobo has only 2 memory slots)
I remove and interchange - No change
I remove one and restart - Bios posts and 4097 Mb detected, windows reads 4GB of RAM
I remove 1st stick and insert 2nd - No post

So I have isolated the faulty RAM.
Just to make sure I insert it in my brother's system, but to my shock the system boots and windows detects 4gb of ram.
I insert my brothers 2gb of ram along with my working 4gb in my system and the bios detects 6gb of DDR3 at 1333 Mhz.

Out of desperation, I finally remove my FX4100 and insert my old Athlon X2 and not to my surprise everything is PERFECT. All RAM is detected. All 8GB of it.
I then check for bent pin in my FX4100. Reseat the CPU and Cooler properly. Check is the cooler is too tight (it is not). Nothing works.

Finally, I flash the bios with the latest upgrade from Gigabyte. This is when I see some changes.
After flashing, when I restart, the bios finally sees 8192 Mb of DDR3 1333Mhz. Windows does the same. 8GB of usable RAM. I use the system for a couple of hours and shut down the system for the night.
Next morning after restart again only 4GB. What went wrong now? After several restarts no solution.
Shut down and forget! :fou: 

That night I plan to tweak the bios on a trial and error basis.
I increase the DRAM voltage 1.6v - No change - Reset to 1.5v
Changed SPD from auto to manual - timings match the RAM defaults
Finally reduced speed from 1333Mhz to 800Mhz - after restart 8192 Mb detected.
worked fine for the whole day.

Next morning on reboot again got 4gb at 800Mhz. So reduced to 667Mhz and got 8GB. Then raised to 800 and still 8GB. But on increasing to 1333 only got 4GB so reverted back to 800Mhz and got 8gb.
So now this is the only temporary solution that I have been using for a couple of days now. If on reboot all 8gb is not detected then I reduce the timing and increase again but only till 800Mhz. More than that and not all RAM is detected.

Now my question is how do I over come this problem. Is the RAM faulty? Are the BIOS settings wrong? I really dont know.

Please advice. Any help will be appreciated.

Thanks

More about : ddr3 1333 ram detected processor upgrade

a c 251 } Memory
November 25, 2012 1:00:13 PM

OR the memory controller on the CPU. The X2 it works all the time and only the CPU changed.
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November 25, 2012 1:17:07 PM

rolli59 said:
OR the memory controller on the CPU. The X2 it works all the time and only the CPU changed.

Can you please specify how do I actually do that.

Yes ONLY the cpu has been changed. Prevously it was X2 now it is FX 4100.

It works fine with X2. Tried and tested.
But as soon as the FX4100 is loaded the problem starts.
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a c 251 } Memory
November 25, 2012 1:31:02 PM

Indicates that the FX is the problem part.
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a b } Memory
November 25, 2012 2:25:07 PM

so let me get this straight.... you are mixing different RAM's
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November 25, 2012 2:38:21 PM

anonymous1 said:
so let me get this straight.... you are mixing different RAM's

No the two stick of RAm are exactly identical

RAM: 2x4GB G.SKILL F3-10666CL9-4GBNT (9-9-9-24 1.5v)

When they are detected at 800 MHz they work just fine. Right now I am using them at 800 Mhz.
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a b } Memory
November 25, 2012 2:39:51 PM

I agree with rolli59, although I'm not 100% sure, the primary suspect for me would be the CPU. If your FX-4100 has a faulty memory controller (the controller is on the CPU) your only option is to get the CPU replaced. It is still under warranty so you shouldn't have any problem getting an RMA. And since you have another working CPU in the meantime at least you won't be without a PC for weeks. Most stores will give at least a 30-day return policy, if that is expired you can check with AMD directly they give a 3 years warranty for a FX-4100, but I would check with the store where you purchased it first.

Just as a side note it's always a good idea to flash the BIOS to the latest version BEFORE putting a new CPU in a mobo. New BIOS version adds support for newly released CPU so in some cases it's mandatory to flash otherwise the CPU won't be supported and the PC won't boot. But in your case if the CPU was faulty from the start it wouldn't have made any difference anyways, but I'm just saying this as a future precaution if you upgrade CPU again in the future.
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November 25, 2012 2:39:54 PM

rolli59 said:
Indicates that the FX is the problem part.

Can it be? Because when the RAMs are detected they just work fine.
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a c 251 } Memory
November 25, 2012 2:42:20 PM

obiforvo said:
Can it be? Because when the RAMs are detected they just work fine.

If the BIOS (presuming reset as well) is updated to a supporting one and the problem only occurs with the FX installed?
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November 25, 2012 2:46:01 PM

rolli59 said:
If the BIOS (presuming reset as well) is updated to a supporting one and the problem only occurs with the FX installed?

This is exactly what I have seen. The BIOS is flashed to latest. Did it a few days back. Then loaded to optimal settings.
RAM sticks work perfect with Athlon X2. Problem only with FX4100

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November 25, 2012 2:49:16 PM

MC_K7 said:
I agree with rolli59, although I'm not 100% sure, the primary suspect for me would be the CPU. If your FX-4100 has a faulty memory controller (the controller is on the CPU) your only option is to get the CPU replaced. It is still under warranty so you shouldn't have any problem getting an RMA. And since you have another working CPU in the meantime at least you won't be without a PC for weeks. Most stores will give at least a 30-day return policy, if that is expired you can check with AMD directly they give a 3 years warranty for a FX-4100, but I would check with the store where you purchased it first.

Just as a side note it's always a good idea to flash the BIOS to the latest version BEFORE putting a new CPU in a mobo. New BIOS version adds support for newly released CPU so in some cases it's mandatory to flash otherwise the CPU won't be supported and the PC won't boot. But in your case if the CPU was faulty from the start it wouldn't have made any difference anyways, but I'm just saying this as a future precaution if you upgrade CPU again in the future.

Fine I will RMA the CPU.
But how do I prove to AMD ( or the retailer) that its the CPU thats faulty.
The CPU just works fine, besides the memory prblem, if it truly is caused by the CPU.

Is there any way of testing the integrity of the CPU?
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a c 251 } Memory
November 25, 2012 2:52:41 PM

Just go to them and state the problem, both CPU's are AMD and should simply work.
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a b } Memory
November 25, 2012 3:03:46 PM

obiforvo said:
But how do I prove to AMD ( or the retailer) that its the CPU thats faulty.

Is there any way of testing the integrity of the CPU?


Sometimes with the 30-day return policy of a store, it's a no-question-asked deal so you might not have to prove anything. And if they ask questions, just tell them that you've been doing a lot of testing and you came to the conclusion it's the CPU. I mean, you did all the right things, flash BIOS, set to default (or "optimal" settings), test the RAM in another PC, then test the previous and new CPU more than once, and the problem seems to be isolated to the new CPU. I don't see how they wouldn't want to replace it after that. AMD might have some advanced tools to test the CPU, check with them on the phone they might guide you through further troubleshooting, but with everything you already did they might just replace the CPU right away.
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November 28, 2012 4:21:56 AM

Hey people, last night I went into BIOS and changed the RAM mode to ganged and full 8gb was detected at 1333. System ran without any probs. But today morning after cold boot same problem.

Any ideas!

Someone told me that I should try making adjustments to NorthBridge Volt Control and CPU NB VID Control. Any idea how much adjustment will be safe.
Any suggestions would be appreciated as I am a total newbie at OCing.
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November 28, 2012 10:00:49 AM

OK an update.
I cleared the CMOS as you asked. I had to remove my GPU in the process. So decided not to install it for the time being. Got some screen shots of the BIOS

https://www.dropbox.com/s/d7s7uvw38jiflb7/IMAG0672.jpg
https://www.dropbox.com/s/p06tlj2hwku7z01/IMAG0673.jpg
https://www.dropbox.com/s/g4qv883axh67fu5/IMAG0674.jpg
https://www.dropbox.com/s/buvdtvb5zioofdy/IMAG0675.jpg

Ok now you can see the BIOS has detected 3582Mb (512 Mb for shared memory, since I did not install the GPU, I guess). So I save and exit. Bios and Windows now detects 7678Mb (+512Mb). Windows say 8GB ram (7.50GB usable).

https://www.dropbox.com/s/qzbq7057vl2a8a7/IMAG0679.jpg
https://www.dropbox.com/s/ql3jthqbepxrjtb/IMAG0677.jpg

So I install the GPU. Again bios gets 4096Mb.
Then I try to increase the CPU-NB volt as suggested. Got it up by .5v at 1.25v. Booted and 8GB. shut down and reboot 8gb.
Think it might have solved the problem. Have to wait and see. Will revert in some time.
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!