RAM not recognised on Windows & Bios

[p3d_guy]

Hi, I recently noticed my RAM is not being updated correctly. I have 16gb ram but only shows 8 on both windows 7 x64 and on bios. However on CPU-ID, it shows i have 16gb.

I've tried unchecking max mem on ms config, removing ram resetting cmos and reinstalling ram, swapping ram, all these but still have no luck resolving this.

I'd appreciate any guidance on this.

See CPU-ID valiator below

Name Intel Core i7-2600K CPU @ 3.40GHz
Threading 1 CPU - 4 Cores - 8 Threads
Frequency 1599.63 MHz (16 * 99.98 MHz)
Architecture Sandy Bridge (32 nm)
CPUID / Stepping 6.A.7 / 6.2A (D2)
CPU Extensions MMX, SSE, EM64T, VT-x, AES, AVX
Caches L1 : 128 KB / L2 : 1024 KB / L3 : 8192 KB
Microcode 0x0000028
Max. TDP 95 Watts
Temperature 42°C
Voltage 1.008 Volts
Type Stock
Motherboard
ModelASRock Z77 Pro4
BIOS American Megatrends Inc. - P1.80 - 07/11/2013
CPU Socket Socket 1155 LGA
North Bridge Intel Sandy Bridge rev 09
South Bridge Intel Z77 rev 04
Memory (RAM)
Size16384 MB
Type DDR3-1333 - Dual Channel
Frequency 666.5 MHz (1:5)
Timings 9-9-9-24
Slot #1 ModulePatriot Memory - 4096 MB (10700)
Slot #2 ModulePatriot Memory - 4096 MB (10700)
Slot #3 ModulePatriot Memory - 4096 MB (10700)
Slot #4 ModuleCorsair - 4096 MB (10700)
Graphic Card (GPU)
GPU TypeNVIDIA GeForce GTX 560 Ti (900 MHz)
VRAM Size 2048 MB (2004 MHz)
Miscellaneous
Windows Version Windows 7 Ultimate Edition 64-bit
Windows Subver SP1 (Build 7601)
CPU-Z Version 1.71

 

[4745454b]

What system, ram, os, etc? Need details if we are to help.

 

[p3d_guy]

http://valid.x86.fr/ga4uhi <<<full pc details

 

[4745454b]

There is no reason I can see as to why it shouldn't see all 16GBs. You said the bios only sees 8GB, so the problem probably lays there. Try manually setting the timings, and make sure the voltage is high enough. Set the timings to 10-10-10-30, and I don't know what voltage the sticks needs so you'll need to figure that out. I'd also try to get it working at 1333 before trying 1600. But you'll need to figure out why the bios only sees 8GB.

 

[Vic 40]

In that picture is there also one corsair stick and three from patriot,maybe there lies a problem.What happens if you take the corsair out?
Maybe adding 0.05 to the vram will help with the corsair stilll in it,but look first if it isn't already @1.65V which should be the max.
Also,tried enabling XMP in the bios?
Maybe even a bios update will be needed.

 

[p3d_guy]

@4745454b and @Vic 40- I can confirm that both patriot and corsair memory require 1.5v, I have attempted to change this to 1.65v but did not worked. However I have not tried to change the timing settings.

- Additionally I have updated the bios to the latest version.

- All RAM currently operating at 1333mhz

I have attempted removing all RAM and tested each all worked fine. I then installed in pairs which works fine. However It's only when I install all that only 2 out of 4 RAMs are recognised on BIOS. It doesnt matter if I swap them around, it always recognised the ones inserted in the 1st and 3rd slot and shows as 'none' in the 2nd and 4th slot.

I will attempt to adjust the voltage to 1.65 and change the ram timing to 10-10-10-30. At present I think it's set to 9-9-9-24.

I will update later this afternoon.

 

[4745454b]

Bad slots? What happens when you boot with only one stick in each slot?

 

[p3d_guy]

I tried to do as advised above but no change. did the volt adjustment to 1.65v, ram timing to 10-10-10-30. Also enabled XMP, but nothing.

I have also tried install each ram at the various slots and all work individually. The problem only occurs when I try to install all four RAMs at a go. Then it only recognizes the slots mentioned above 1 and 3.

 

[Vic 40]

You could go into the bios again and in the "OC tweaker" up the " VTT voltage" a notch and try again.Don't go to high with this!
I will see if Tradesman1 has an idea of how high that will/may go.I can't find the exact figures.So keep it at most at two notches up and wait otherwise for more info.Maybe you can tell us how high the default is? Maybe even min. and max. values?
The "VTT" voltage is btw for the memory controller of the cpu,maybe that will need some extra to keep it going.

Does it btw work with just the three Patriot modules?

 

[Tradesman1]

Initially try 1.15 on the VTT (think list CPUVTT on your mobo but might be DDRVTT) also raise DRAM voltage + 0.06....if that doesn't do it, check in the advanced DRAM timings and let me know what the tRFC is set at

 

[4745454b]

I tried to do as advised above but no change.

Not quite what I asked. What happened when you used each slot? Single stick in each slot.

 

[Vic 40]

Not quite what I asked. What happened when you used each slot? Single stick in each slot.

Seems like he answered that,

I have also tried install each ram at the various slots and all work individually.