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Unable to see/use all 16GB of RAM

post #1 of 23
Thread Starter 
ASUS P8Z68-M PRO
Intel 3570K
G.Skill Ares 8GB 2133 X2 sets

This setup was previously working and even passed a 12 hours stress test (P95 with 95% RAM usage) without issue. RAM was set to stock speeds (2133 11-11-11-28 1.6V)



Not sure what the issue is here but I can no longer see all 16GB of my RAM in BIOS or in OS. The BIOS only reports 8GB but when I use the ASUS tool to view each slot individually it sees that each slot is loaded with 4GB of RAM. Everything is running at stock settings. 3.4GHz and 1600mhz on the RAM.

CPU is at stock settings and the RAM is running at 1600 MHz as any overclock to 2133 fails immediately regardless of the amount of RAM installed.

Tests I have done:

1. Checked the BIOS for settings that could possibly control this, haven't found anything.

2. Currently running 3905 BIOS, flashed back to 3902 with no luck and back to 3905 with no change.

3. I tested each slot with a single 4GB stick and confirmed it boots and reports properly. Therefore I assume each slot works.

4. I tested each 8GB kit in each combination of slots. Both sets boot with 8GB in each set of slots (Blue and Black). BIOS reports 8GB as expected.

5. I then put all 16GB in and BIOS only reports 8GB, Windows 7 only reports 8GB. See below. CPU-z is showing a 4GB stick in each slot and sees there is 16GB installed but windows can only see 8GB of it.












6. Each stick is going through 3 passes of MemTest 86+ (at 1600 MHz) individually. All Sticks passed. When I initially put all 16GB in to run with MemTest it also only tested 8GB so I went to testing each stick separately. It however did report that there was a 4GB stick in each slot.

7. I double checked and the MOBO can support more than 16GB and it previously has run all 16GB for me.
Quote:
4 x DIMM, Max. 32GB, DDR3 2200(O.C.)/2133(O.C.)/1866(O.C.)/1600/1333/1066 MHz Non-ECC, Un-buffered Memory

8. I also double checked the CPU support and BIOS needed (since its a Z68 with Ivy Bridge)
Quote:
Core i5-3570K (3.4G,L3:6M,iGPU,4C,77W,rev.E1) is supported since since BIOS 3702

9. Ran MemTest86+ with the same stick in all four slots. No errors.

[10, 11, 12 are suggestions from ASUS Technical Support.]

10. Checked to see if the CPU is installed well and checked for bent pins. No Issues.




11. Cleared the CMOS per the manual with no change.

12. Try another set of RAM.

13. Tried bumping RAM voltage to 1.64, no change



What am I missing here? Im thinking the MOBO is bad or possibly the chip is having issues, any ideas?


While poking through the manual and BIOS I noticed that I have lost some functions in the BIOS which I had previously.

Ability to switch to the iGPU is gone.


When in manual overclocking mode none of the options show up. (ie. CPU ratio, Turbo Mode ect.)

Edited by silvrr - 3/21/13 at 4:45am
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post #2 of 23
Have you ran memtest with the sticks plugged into different slots? You said you tried all 4 sticks, but did you try them all in the same slot? Try moving a stick that you know is good into different memory slots and seeing if it passes memstest again. I couldnt see it being your mobo that is bad if all 4 memory slots are working properly and passing memtest. It could be the overclock casuing the issues. I couldnt be 100% sure on this, but if they pass memtest in all 4 slots, try resetting bios to default and then repower the system on with stock setting and see if they register again.
post #3 of 23
Thread Starter 
Quote:
Originally Posted by yofghi View Post

Have you ran memtest with the sticks plugged into different slots? You said you tried all 4 sticks, but did you try them all in the same slot? Try moving a stick that you know is good into different memory slots and seeing if it passes memstest again.

4th Stick passed so going to try this now. See item 3 above, they all work but can't hurt to run memtest in each one and double check. Added in #9 above.
Quote:
I couldnt see it being your mobo that is bad if all 4 memory slots are working properly and passing memtest. It could be the overclock casuing the issues. I couldnt be 100% sure on this, but if they pass memtest in all 4 slots, try resetting bios to default and then repower the system on with stock setting and see if they register again.

See item 2 above. Ive tried different BIOS and when you re-load them your at default settings. No overclock has been in play in any of these tests. The RAM is actually de-clocked to 1600 Mhz from its rated 1600 Mhz for all these tests.
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post #4 of 23
Could be a bad board ? Or maybe there is a newer BIOS update that may broaden the RAM compatibility. Those are the only thigns I can think of. There was another post I read about earlier where a guy had the same problem and it ended up being the board.
post #5 of 23
Thread Starter 
Quote:
Originally Posted by yofghi View Post

Could be a bad board ? Or maybe there is a newer BIOS update that may broaden the RAM compatibility. Those are the only thigns I can think of. There was another post I read about earlier where a guy had the same problem and it ended up being the board.

Yeah, like I said Im thinking board or the chip. Not sure if the IMC on the chip would do this though. The 3905 BIOS is the latest BIOS available and previously worked perfectly with all 16GB of RAM.
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post #6 of 23
Have you called the manufacturer and asked about it? They might have a little more insight on the situation? Although I believe they will most likely just tell you to RMA it.
post #7 of 23
Thread Starter 
Quote:
Originally Posted by yofghi View Post

Have you called the manufacturer and asked about it? They might have a little more insight on the situation? Although I believe they will most likely just tell you to RMA it.

No, not yet. Wanted to narrow it down and make sure the RAM was good. If all the slots pass memtest ill likely give ASUS a call.
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post #8 of 23
Thread Starter 
Well over yesterday and this morning I got all 4 slots tested with the same stick and no errors. I think Im just going to send the first post to ASUS and see what they say.
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post #9 of 23
Thread Starter 
Alright got a response from ASUS.

Their recommendations are as follows.

10. Check to see if the CPU is installed well and check for bent pins.

11. Clear the CMOS per the manual. (pretty sure re-flashing the BIOS twice would take care of this but Ill give it a try)

12. Try another set of RAM

Ill try 10 and 11 tonight but finding/buying another 16GB of RAM to test is either going to be 85 bucks for 2 8GB sets or 110 bucks for a 16GB 4x4 set.
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post #10 of 23
Thread Starter 
Anyone else have any ideas before I pick up another 16GB kit to test with? Im tempted to just sell one of the 8GB kits as I rarely go over 8GB RAM usage. Only time is when I'm stitching a large panoramic image.
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