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Bad Memory Detection.


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#1 xXAlphaXx

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Posted 10 October 2012 - 04:24 AM

Oh x58. How I hate you so.


Okay, so here is what is currently going on. I bought an ASUS P6X58-E WS board and fitted it with 24GB of Corsair Vengeance (3x) (2x4GB). Booted, installed Windows, all 24GB in use, all was well.

Well, then my CPU started running hot, so I ended up taking the whole board out to remove and remount my cooler, this ended up dropping my temps quite a bit, all WAS well, until I noticed that Windows was only working with 16GB.

Oh, well must be loose ram or something, so I reseat all the ram. Actually as it turns out, Windows and the BIOS ignore anything in A1 and A2. Why? I dunno, maybe they don't get along.

I can confirm that their is NO hardware failure, Memtest, everest, Aida64, CPU-Z can all see all the ram and all 6 slots on the board clear as day.


So far I have tried:

Reseating memory
Reseating CPU (memory controller on the chip. BAD INTEL!)
Playing AI tuner (DRAM @ 1.64, QPI/DRAM @ 1.35)
Manually setting the frequency to 1600Mhz (stock)/1333/1066
Downgrading BIOS/upgrading BIOS
Clearing CMOS


I am totally stumped. Anyone have any ideas?

Edited by xXAlphaXx, 10 October 2012 - 04:25 AM.

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#2 Phoenix102

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Posted 11 October 2012 - 12:48 AM

Hi xXAlphaXx,

Have you read through the manual on your mobo? Section 2.4 deals with RAM. What is the Corsair model number of your RAM (something like CMZ8GX3M2A1600C9B)?

This model, CMZ8GX3M2A1600C9B, is 1600. The manual says Due to Intel spec definition, X.M.P. DIMMs and DDR3-1600 are supported for one DIMM per channel only.

Have you tried the other configurations like one DIMM in A1 and B1 only and see if windows sees A1?

Have you set the proper voltage and timings for the RAM in BIOS? The above referenced model is:

DDR3 1600 (PC3 12800)
Timing 9-9-9-24
Cas Latency 9
Voltage 1.5V

Let me know what you find.

#3 xXAlphaXx

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Posted 11 October 2012 - 08:26 AM

Actually, it is all CMZ8GX3M2A1600C9B.

I have tried setting the timings and voltage and speed, and it still does not detect anything in A1/A2

Actually I have played around with stick configurations like that, I have put a single stick in A1 (as per intel config, it should boot) but it does not boot. For funzies I put it a single stick in C1 to get it too boot. Afterwards I loaded both A1 and A2 to test if it was seeing anything. It was only seeing the 4GB in C1.

However, all my other software like memtest and cpu-z can see the ram in A1/A2 fine.
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#4 Phoenix102

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Posted 11 October 2012 - 10:52 AM

What does BIOS say about a single stick in A1? Will the PC POST?

Do you have any other DDR3 RAM?

#5 xXAlphaXx

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Posted 11 October 2012 - 10:56 AM

No, the PC will not post with a single stick in A1. But it will with a single in B1 or C1. I guess my board needs to accept that it has an A channel and it needs to use it!

I do have other ram, it was 3 x 2GB and 3 x 1GB. Weird configuration if you ask me...
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#6 Phoenix102

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Posted 11 October 2012 - 11:02 AM

Can you try one stick of 1GB in A1? I want to rule out RAM incompatability.

Be sure to set the BIOS to defaults first to reset the RAM timings and voltage.

#7 xXAlphaXx

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Posted 11 October 2012 - 11:04 AM

Will do as soon as I get home, will respond to this topic when I get a chance to test it.
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#8 xXAlphaXx

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Posted 11 October 2012 - 02:55 PM

Okay, tried both a 1GB stick and a 2GB stick in A1. no posting.
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#9 Phoenix102

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Posted 12 October 2012 - 10:54 AM

Ok. In a well lit room can you visually inspect the A channel slots compared to the others and see if there are bent pins, debris in the slot or cracked plastic?

Install all of the Corsair RAM again. Your motherboard supports X.M.P. and so does your RAM. Let's set that. In section 3.4 of the manual it tells you to set the Ai Overclock Tuner to X.M.P. to optimize memory parameters. This will auto set the memory so you don't have to manually set it.

Please run a DDS scan.

Post your inspection findings and the DDS log in your reply.

#10 xXAlphaXx

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Posted 12 October 2012 - 12:34 PM

No physical damage to A channel or any other channel. Set to XMP in the Ai. (still only 16GB)

Here is the log:

Spoiler

Edited by xXAlphaXx, 12 October 2012 - 12:35 PM.

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#11 Phoenix102

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Posted 12 October 2012 - 01:53 PM

Download Speccy and run it. Uncheck the install (whatever it tries to install) with Speccy. Let it analyze the PC. When it fininshes click File> Save as text file. Give it a name and save it to the desktop. Open it with notepad and copy all of it's contents in a reply back.

#12 xXAlphaXx

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Posted 12 October 2012 - 02:10 PM

Here's Speccy:

Spoiler





That's a lot of text. Thank god for spoiler tags.

Edited by xXAlphaXx, 12 October 2012 - 02:14 PM.

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#13 Phoenix102

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Posted 12 October 2012 - 04:08 PM

The only answer I have is those two slots (that channel) is bad. Look at this:

RAM

Memory slots
Total memory slots 6
Used memory slots 4
Free memory slots 2

Memory
Type DDR3
Size 24576 MBytes
Channels # Dual
DRAM Frequency 801.8 MHz
CAS# Latency (CL) 9 clocks
RAS# to CAS# Delay (tRCD) 9 clocks
RAS# Precharge (tRP) 9 clocks
Cycle Time (tRAS) 24 clocks
Command Rate (CR) 2T

Physical Memory
Memory Usage 35 %
Total Physical 16 GB
Available Physical 10 GB
Total Virtual 32 GB
Available Virtual 25 GB

SPD
Number Of SPD Modules 6

Slot #1
Type DDR3
Size 4096 MBytes
Manufacturer Corsair
Max Bandwidth PC3-10700H (667 MHz)
Part Number CMZ8GX3M2A1600C9
SPD Ext. EPP
XMP--2
Frequency
JEDEC #4
Frequency 666.7 MHz
CAS# Latency 9.0
RAS# To CAS# 9
RAS# Precharge 9
tRAS 24
tRC 34
Voltage 1.500 V


Slot #2
Type DDR3
Size 4096 MBytes
Manufacturer Corsair
Max Bandwidth PC3-10700H (667 MHz)
Part Number CMZ8GX3M2A1600C9
SPD Ext. EPP
XMP--2
Frequency
JEDEC #4
Frequency 666.7 MHz
CAS# Latency 9.0
RAS# To CAS# 9
RAS# Precharge 9
tRAS 24
tRC 34
Voltage 1.500 V


Slot #3
Type DDR3
Size 4096 MBytes
Manufacturer Corsair
Max Bandwidth PC3-10700H (667 MHz)
Part Number CMZ8GX3M2A1600C9
SPD Ext. EPP
XMP--2
Frequency
JEDEC #4
Frequency 666.7 MHz
CAS# Latency 9.0
RAS# To CAS# 9
RAS# Precharge 9
tRAS 24
tRC 34
Voltage 1.500 V


Slot #4
Type DDR3
Size 4096 MBytes
Manufacturer Corsair
Max Bandwidth PC3-10700H (667 MHz)
Part Number CMZ8GX3M2A1600C9
SPD Ext. EPP
XMP--2
Frequency
JEDEC #4
Frequency 666.7 MHz
CAS# Latency 9.0
RAS# To CAS# 9
RAS# Precharge 9
tRAS 24
tRC 34
Voltage 1.500 V


Slot #5
Type DDR3
Size 4096 MBytes
Manufacturer Corsair
Max Bandwidth PC3-10700H (667 MHz)
Part Number CMZ8GX3M2A1600C9
SPD Ext. EPP
XMP--2
Frequency
JEDEC #4
Frequency 666.7 MHz
CAS# Latency 9.0
RAS# To CAS# 9
RAS# Precharge 9
tRAS 24
tRC 34
Voltage 1.500 V


Slot #6
Type DDR3
Size 4096 MBytes
Manufacturer Corsair
Max Bandwidth PC3-10700H (667 MHz)
Part Number CMZ8GX3M2A1600C9
Serial Number 6671297A
SPD Ext. EPP
XMP--2
Frequency
JEDEC #4
Frequency 666.7 MHz
CAS# Latency 9.0
RAS# To CAS# 9
RAS# Precharge 9
tRAS 24
tRC 34
Voltage 1.500 V

It shows 6 slots with 4 used but indentifies memory in all six slots. Your DDS log ID's 16GB in windows too. So, the RAM is working and the serial presence detect (the on board EEPROM programmed by the manafacturer to identify the module type and timing parameters)is getting back to the motherboard but the rest of the module is not.

#14 xXAlphaXx

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Posted 12 October 2012 - 04:12 PM

Damn, so should I set up an RMA?

But thats weird, why would it stop working after reapplying the HSF?

Edited by xXAlphaXx, 12 October 2012 - 04:16 PM.

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#15 Phoenix102

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Posted 12 October 2012 - 04:57 PM

That is the channel closest to the processor. While pressing the HSF locks into place maybe the board flexed enough to break a poorly done solder joint or crack the motherboard. The SPD chip voltage and I/O is pin 236 and 238 respectively and the clock IP is at pin 118. That end of the channel sockets must be working (closest to the corner of the motherboard). This is the best answer I have as to why you see what you do.

An RMA looks like the only option.

Edited by Phoenix102, 12 October 2012 - 05:01 PM.





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