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Gigabyte P55a-ud -8G ram installed (4G usable)

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March 27, 2012 12:15:56 PM

Dear All,

Even installing the latest BIOS but BIOS reports 8G but 2 dimm channel is disabled.

Win7 (64bit) reports 8G (4 G usable).

There is 4 x 2G ram.

How to solve this?
a c 328 V Motherboard
March 27, 2012 1:00:27 PM

Make sure the Max memory is clear, unchecked.

a c 715 V Motherboard
March 27, 2012 1:19:19 PM

The above can happen (MSCONFIG), but it too could be several things including: Voltage issue, Mix-matched RAM, Grounding from the HSF (metal to MOBO), Bent CPU pins, Partitioned drives with 32-bit, Memory Remapping -> Disabled, Poorly seated sticks, Unsupported CPU, Warez OS, etc.

On LGA 1156 it was very common for bent CPU pins to cause this issue. However, before pulling the CPU we need to sort though simpler issues first.

Q - What exact MOBO and revision? Gigabyte P55A-UD_?
Q - What exact RAM? Please provide link(s) to RAM kit(s)
Q - What CPU?
Related resources
April 7, 2012 4:07:59 AM

It is P55A-UD3 (rev2), bios version f11
Ram is 8G in 4 modules....
CPI i5
a c 715 V Motherboard
April 7, 2012 1:47:39 PM

I need link(s) to your EXACT RAM (Frequency, CAS, and Voltage) and I need to know the EXACT CPU (GHz per RAM Frequency); see below give you an idea (for non ASUS the BCLK must be adjusted). At this rate your problem might be resolved next month...
April 17, 2012 1:41:48 AM

Where to check for the frequency, CAS, voltage?

All in BIOS setup?


jaquith said:
I need link(s) to your EXACT RAM (Frequency, CAS, and Voltage) and I need to know the EXACT CPU (GHz per RAM Frequency); see below give you an idea (for non ASUS the BCLK must be adjusted). At this rate your problem might be resolved next month...
http://i1013.photobucket.com/albums/af254/Jaquith/266DOCP.jpg
a c 715 V Motherboard
April 18, 2012 12:50:55 PM

Still need the 'CPU' tab and while you're at it also post the 'Mainboard' tab.
April 18, 2012 2:51:01 PM







jaquith said:
Still need the 'CPU' tab and while you're at it also post the 'Mainboard' tab.
a c 715 V Motherboard
April 18, 2012 3:34:01 PM

CPU: Intel® Core™ i5-760 Processor (8M Cache, 2.80 GHz)
RAM: DDR3-1333 9-9-9-25 @ 1.50v
MOBO: (CPU-z failed to display the correct revision)
GA-P55A-UD3 (rev. 2.0) - http://www.gigabyte.com/products/product-page.aspx?pid=...
GA-P55A-UD3 (rev. 1.0) - http://www.gigabyte.com/products/product-page.aspx?pid=...

BIOS, in either case the latest BIOS revision is F11 "Enhanced memory compatibility" therefore in this case I recommend that you update to F11.

Use the Q-Flash procedure - video, and a FAT32 Flash Drive in any 'black' USB 2.0 port on the MOBO's rear I/O:
Part 1 - http://www.youtube.com/watch?v=UCCId1Mcrw4
Part 2 - http://www.youtube.com/watch?v=Qlx5GBkiaM0
Part 3 - http://www.youtube.com/watch?v=EX78S4qyHu0

DIMM Installation:
If the RAM came in two kits of 2x2GB then the following:
CPU: | New | Old | New | Old |
Problem persists:
CPU: | Old | New | Old | New |

BIOS Manual settings:
Advanced Memory Settings /
Extreme Memory Profile (X.M.P.) -> Disabled
System Memory Multiplier (SPD) -> 10 ; BCLK 133.33MHz * 10 = DDR3-1333
DRAM Timing Selectable (SPD) -> Quick
/
CAS Latency Time -> 9
tRCD -> 9
tRP -> 9
tRAS -> 25
/
QPI/Vtt Voltage -> 1.20v
DRAM Voltage -> 1.50v

Save & Exit = Yes
April 19, 2012 1:27:33 PM


I cannot find this entry:
Extreme Memory Profile (X.M.P.) -> Disabled

After performing the rest items adjustment and RAM swapping, it still gets 4G.







jaquith said:
CPU: Intel® Core™ i5-760 Processor (8M Cache, 2.80 GHz)
RAM: DDR3-1333 9-9-9-25 @ 1.50v
MOBO: (CPU-z failed to display the correct revision)
GA-P55A-UD3 (rev. 2.0) - http://www.gigabyte.com/products/product-page.aspx?pid=...
GA-P55A-UD3 (rev. 1.0) - http://www.gigabyte.com/products/product-page.aspx?pid=...

BIOS, in either case the latest BIOS revision is F11 "Enhanced memory compatibility" therefore in this case I recommend that you update to F11.

Use the Q-Flash procedure - video, and a FAT32 Flash Drive in any 'black' USB 2.0 port on the MOBO's rear I/O:
Part 1 - http://www.youtube.com/watch?v=UCCId1Mcrw4
Part 2 - http://www.youtube.com/watch?v=Qlx5GBkiaM0
Part 3 - http://www.youtube.com/watch?v=EX78S4qyHu0

DIMM Installation:
If the RAM came in two kits of 2x2GB then the following:
CPU: | New | Old | New | Old |
Problem persists:
CPU: | Old | New | Old | New |

BIOS Manual settings:
Advanced Memory Settings /
Extreme Memory Profile (X.M.P.) -> Disabled
System Memory Multiplier (SPD) -> 10 ; BCLK 133.33MHz * 10 = DDR3-1333
DRAM Timing Selectable (SPD) -> Quick
/
CAS Latency Time -> 9
tRCD -> 9
tRP -> 9
tRAS -> 25
/
QPI/Vtt Voltage -> 1.20v
DRAM Voltage -> 1.50v

Save & Exit = Yes

a c 715 V Motherboard
April 19, 2012 2:03:42 PM

Change the voltages by +0.05v:
QPI/Vtt Voltage -> 1.25v
DRAM Voltage -> 1.55v ; failure 1.58v

Save & Exit = Yes

/edit - if the problem persists then test (1) stick of RAM at a time:
CPU: | - | RAM | - | - |
April 29, 2012 8:34:47 AM

Do you mean to test any failure of individual RAM?


jaquith said:
Change the voltages by +0.05v:
QPI/Vtt Voltage -> 1.25v
DRAM Voltage -> 1.55v ; failure 1.58v

Save & Exit = Yes

/edit - if the problem persists then test (1) stick of RAM at a time:
CPU: | - | RAM | - | - |

a c 715 V Motherboard
April 29, 2012 10:25:47 AM

If the voltages don't correct the problem then correct, test (1) stick at a time to determine the 'bad' stick of RAM.
May 7, 2012 1:34:10 AM

Increase voltage does not help.

Is it a faulty RAM module


jaquith said:
If the voltages don't correct the problem then correct, test (1) stick at a time to determine the 'bad' stick of RAM.

a c 715 V Motherboard
May 7, 2012 12:13:33 PM

I don't know what you did or didn't do. IF you manually set the DRAM Frequency, CAS Timings and Voltage exactly as I posted -- The RAM should work is the RAM is ALL exactly the same part number.

if the problem persists then test (1) stick of RAM at a time:
CPU: | - | RAM | - | - |


Next assuming you did test EACH stick individually and it passed then that leaves you with (3) possibilities:
(1) Bad RAM - RMA or replace, RAM is cheap
(2) Bent CPU pins - common to LGA 1156
(3) Bad MOBO

May 7, 2012 1:12:47 PM

I have bought 4 new modules of 4G RAM total of 16G.
After installing them, it can still only detect 2 module which is 8G.
I think it is not a problem of the ram.

Besides, how to check bent pins? What to do?

And what is MOBO?
a c 715 V Motherboard
May 7, 2012 1:34:41 PM

You have to remove the CPU and look for bent CPU pins. MOBO = MOtherBOard. If you're using an aftermarket HSF (Heat Sink Fan) with a metal backplate <or> a case with 'fake' (punch-out) standoff's then this 'can' cause a grounding short which can mimic the same problem as bent CPU pins.

Example of proper - Standoffs:


Bent CPU Pins (i3/i5/i7 'Missing' Memory) - http://www.tomshardware.com/forum/275856-30-gigabyte-gu...
a b V Motherboard
May 7, 2012 1:43:17 PM

Imo check only one stick in each slot @ time
If there's any solt that not detect your installed memory then rma your mobo cause it might possible MOBO is faulty :) 
a b V Motherboard
May 7, 2012 1:49:17 PM

I also recommend you to go through your mobo manual to check out is everything correct
a b V Motherboard
May 7, 2012 1:51:55 PM

Also if you have another set of ram put them in your mobo to check is ram casuing trouble
a b V Motherboard
May 7, 2012 2:10:59 PM

What's RAM brand n Model ?
a b V Motherboard
May 7, 2012 4:12:39 PM

First, did you ever check the settings as recommended by Nikorr? http://www.tomshardware.com/forum/309338-30-gigabyte-p5...
Run msconfig, then go to the Boot tab and click "Advanced options ...". The "maximum memory" box should be unchecked.

If that box is not checked, then:

Second, the CPU-Z screenshot of the Memory tab is interesting. See the pic posted on 4/18/12: http://www.tomshardware.com/forum/309338-30-gigabyte-p5...

In the screenshot, the "Channels #" shows Single. This should show Dual. From Gigabyte's manual "Dual Channel mode cannot be enabled if only one DDR3 memory module is installed."

While this could be caused by bent pins, the most likely cause is that the RAM sticks are not fully seated. I agree with others who have recommended checking the RAM one or two at a time. I would start with 2 at a time. Put one stick in the second slot from the CPU, and one stick in the fourth slot from the CPU (the farthest slot from the CPU). The closest slot to the CPU and the third slot should remain empty. Boot your CPU and see if all the RAM is recognized. Also, please post screenshots of the Memory tab and the SPD tab of CPU-Z.

If those two sticks are correctly recognized by your computer, then repeat the exact same tests with the other 2 sticks of RAM and post the results.

Each time you test, be sure that the RAM sticks have snapped fully into place. When P55 boards first came out this was by far the most common cause of memory issues until folks became used to the locking mechanisms.

If at any point during your testing the sticks are not read correctly, test those sticks one at a time.
!