8gb memory not recognised

[JonUKRAH]

I bought 2 8gb sticks to upgrade with, I have double checked specs and even sent back for replacements but the motherboard still wont recognise rither of them, any suggestions appreciated!

[Lil_Boy_Blue]

Hi

I use Piriform Speccy to tell me what my RAM really is.

So I guess you have a stick that fits and works?

If so post the details please...

    Type    DDR3
    Size    8192 MBytes
    Channels #    Single
    DRAM Frequency    798.4 MHz
    CAS# Latency (CL)    11 clocks
    RAS# to CAS# Delay (tRCD)    11 clocks
    RAS# Precharge (tRP)    12 clocks
    Cycle Time (tRAS)    28 clocks
    Bank Cycle Time (tRC)    39 clocks
Physical Memory
    Memory Usage    45 %
    Total Physical    6.94 GB
    Available Physical    3.76 GB
    Total Virtual    14 GB
    Available Virtual    9.92 GB
SPD
    Number Of SPD Modules    1
        Slot #1
            Type    DDR3
            Size    8192 MBytes
            Manufacturer    Samsung
            Max Bandwidth    PC3-12800 (800 MHz)
            Part Number    M471B1G73DB0-YK0
            Serial Number    334784733
            Week/year    33 / 15
              

[JonUKRAH]

It has had an upgrade already and I have the 12800 spec ram, details below. It has been suggested to me there is a setting in the BIOS to restrict hardware changes (large companies use it to stop people taking upgrades home) but i cant see anything.

RAM
Memory slots
Total memory slots 2
Used memory slots 2
Free memory slots 0
Memory
Type DDR3
Size 8192 MBytes
Channels # Dual
DRAM Frequency 797.7 MHz
CAS# Latency (CL) 11 clocks
RAS# to CAS# Delay (tRCD) 11 clocks
RAS# Precharge (tRP) 11 clocks
Cycle Time (tRAS) 28 clocks
Command Rate (CR) 1T
Physical Memory
Memory Usage 46 %
Total Physical 7.90 GB
Available Physical 4.25 GB
Total Virtual 88 GB
Available Virtual 82 GB
SPD
Number Of SPD Modules 2
Slot #1
Type DDR3
Size 4096 MBytes
Manufacturer Samsung
Max Bandwidth PC3-12800 (800 MHz)
Part Number M378B5173EB0-YK0
Serial Number 2510327758
Week/year 03 / 16
Timing table
Frequency CAS# Latency RAS# To CAS# RAS# Precharge tRAS tRC Voltage
JEDEC #1 457.1 MHz 6.0 6 6 16 22 1.350 V
JEDEC #2 533.3 MHz 7.0 7 7 19 26 1.350 V
JEDEC #3 609.5 MHz 8.0 8 8 22 30 1.350 V
JEDEC #4 685.7 MHz 9.0 9 9 24 33 1.350 V
JEDEC #5 761.9 MHz 10.0 10 10 27 37 1.350 V
JEDEC #6 800.0 MHz 11.0 11 11 28 39 1.350 V
Slot #2
Type DDR3
Size 4096 MBytes
Manufacturer Crucial Technology
Max Bandwidth PC3-12800 (800 MHz)
Part Number CT51264BD160BJ.C8F
Serial Number 342261173
Week/year 43 / 16
Timing table
Frequency CAS# Latency RAS# To CAS# RAS# Precharge tRAS tRC Voltage
JEDEC #1 457.1 MHz 6.0 6 6 16 22 1.350 V
JEDEC #2 533.3 MHz 7.0 7 7 19 26 1.350 V
JEDEC #3 609.5 MHz 8.0 8 8 22 30 1.350 V
JEDEC #4 685.7 MHz 9.0 9 9 24 33 1.350 V
JEDEC #5 761.9 MHz 10.0 10 10 27 37 1.350 V
JEDEC #6 800.0 MHz 11.0 11 11 28 39 1.350

[wb2001]

@JonUKRAH,

What (2) 8GB RAM modules did you buy?

The correct Crucial (2) 8GB kit  can be found here

I do not know of any BIOS setting that would handicap installation.

[Lil_Boy_Blue]

Hi

"I bought 2 8gb sticks to upgrade with, I have double checked specs and even sent back for replacements but the motherboard still wont recognise rither of them, any suggestions appreciated!"

So can you now list / tell us what RAM sticks you bought?

You currently have 2 x 4GB whaich seem to be a matched pair, and so 16 GB should be attainable.

 The Main Board supports the following...

• • PC3L-12800 (DDR3L-1600)
  • PC3L-10600 (DDR3L-1333)
• Supports 1 GB, 2 GB, 4 GB and 8 GB DIMMs

[erico]

@JonUKRAH

The actual issue is that you have installed two memory modules that are not absolutely identical. 

In the information you have provided,  I see that one is Samsung and the other is Crucial.  Matching memory modules with specs alone, just does not always work, as you have discovered. Unless your pockets  are infinitely deep and amount of patience you have is infinite, let the vendors and memory manufacturers do the testing. They stand to lose their reputation when they guarantee compatibility and you discover that it is not the case. 

If you want 8GB and the upgrade to work then you need to install  a pair of Crucial 4GB DDR3L-1866 UDIMM

  CT51264BD186DJ modules.  They are modules guaranteed to be compatible with your PC.

The Odense motherboard that is installed in your desktop PC does suport a max of 16 GB. See the following HP web document. But remember don't upgrade with specs alone. 

https://support.hp.com/vn-en/product/hp-pavilion-550-200-desktop-pc-series/9259612/model/10217433/do...

 If you live in the UK or Europe see the following link. They sell guaranteed compatible 8GB modules.

https://www.mrmemory.co.uk/memory-ram-upgrades/hp/pavilion-desktop/550-235na

[JonUKRAH]

---

@erico wrote:

@JonUKRAH

The actual issue is that you have installed two memory modules that are not absolutely identical. 

In the information you have provided,  I see that one is Samsung and the other is Crucial.  Matching memory modules with specs alone, just does not always work, as you have discovered. Unless your pockets  are infinitely deep and amount of patience you have is infinite, let the vendors and memory manufacturers do the testing. They stand to lose their reputation when they guarantee compatibility and you discover that it is not the case. 

If you want 8GB and the upgrade to work then you need to install  a pair of Crucial 4GB DDR3L-1866 UDIMM

  CT51264BD186DJ modules.  They are modules guaranteed to be compatible with your PC.

The Odense motherboard that is installed in your desktop PC does suport a max of 16 GB. See the following HP web document. But remember don't upgrade with specs alone. 

https://support.hp.com/vn-en/product/hp-pavilion-550-200-desktop-pc-series/9259612/model/10217433/do...

 If you live in the UK or Europe see the following link. They sell guaranteed compatible 8GB modules.

https://www.mrmemory.co.uk/memory-ram-upgrades/hp/pavilion-desktop/550-235na

---

my apologies, maybe i wasnt clear in my initial post - the details i posted there are of my current memory that works just fine, it is when i try and use the 2 sticks i have that are 8gb each  it fails. The two i have are crucial 12800 as it happens, but even alone the motherboard is not recognising them. i have tried a couple of configurations;

one 4gb & one &gb;

machine sarts and runs fine, but only shows 4gb memory in both BIOS & windows

1  8gb stick alone;

get beep error code saying no memory installed

2 8gb sticks;

get beep error code saying no memory installed

I have sent the memory back and had replacements so I am sure it is not an issue there. and they are the correct 12800 spec. I have also borrowed an 8gb Samsung stick from a friend and had same results. For some reason the motherboard wont/cant see them. I am hoping that someone may have some across this issue and know a solution, or maybe  roll back on the BIOS is needed.