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

Toggle sidebar Toggle sidebar
G

geossl

Distinguished
Oct 25, 2010
10
0
18,510
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?
 
Sort by date Sort by votes
nikorr

nikorr

Champion
Oct 22, 2009
23,335
0
54,960
Make sure the Max memory is clear, unchecked.

image6.png
 
Upvote 0 Downvote
jaquith

jaquith

Glorious
Feb 8, 2009
14,235
27
49,290
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?
 
Upvote 0 Downvote
jaquith

jaquith

Glorious
Feb 8, 2009
14,235
27
49,290
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...
266DOCP.jpg
 
Upvote 0 Downvote
G

geossl

Distinguished
Oct 25, 2010
10
0
18,510
Upvote 0 Downvote
jaquith

jaquith

Glorious
Feb 8, 2009
14,235
27
49,290
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=3439#bios
GA-P55A-UD3 (rev. 1.0) - http://www.gigabyte.com/products/product-page.aspx?pid=3242#bios

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
 
Upvote 0 Downvote
G

geossl

Distinguished
Oct 25, 2010
10
0
18,510
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.








 
Upvote 0 Downvote
G

geossl

Distinguished
Oct 25, 2010
10
0
18,510
Do you mean to test any failure of individual RAM?



 
Upvote 0 Downvote
G

geossl

Distinguished
Oct 25, 2010
10
0
18,510
Increase voltage does not help.

Is it a faulty RAM module



 
Upvote 0 Downvote
jaquith

jaquith

Glorious
Feb 8, 2009
14,235
27
49,290
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

 
Upvote 0 Downvote
G

geossl

Distinguished
Oct 25, 2010
10
0
18,510
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?
 
Upvote 0 Downvote
jaquith

jaquith

Glorious
Feb 8, 2009
14,235
27
49,290
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:
21BJM6ZY5ML._SL500_AA300_.jpg


Bent CPU Pins (i3/i5/i7 'Missing' Memory) - http://www.tomshardware.com/forum/275856-30-gigabyte-guide
 
Upvote 0 Downvote
E

ekoostik

Distinguished
Sep 9, 2009
1,327
0
19,460
First, did you ever check the settings as recommended by Nikorr? http://www.tomshardware.com/forum/309338-30-gigabyte-p55a-installed-usable#t2076738
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-p55a-installed-usable#t2083409

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.
 
Upvote 0 Downvote
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom