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Seann1
Phosphor

Using DELL Optiplex GX620 - Installing 6 GB of RAM

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I'm running Ubuntu Linux (64-bit) and upgraded from 4 GB to 6 GB of RAM. Currently, this is how my Optiplex GX620 rates, according to BIOSAgentPlus:

BIOS Type: Phoenix
BIOS Date: October 13th, 2005
BIOS ID: OptiPlex GX620
BIOS OEM: A05
Chipset: Intel 2770 rev 2
SuperIO: Unknown
Manufacturer: Dell Inc.
Motherboard: OptiPlex GX620

As I understand it, A05 is capped at 4 GB, even though my 64-bit OS will see more, if the BIOS allows. If I flash up to A11, will that remove the 4 GB limitation, or am I still stuck with it?

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14 Replies

Re: Using DELL Optiplex GX620 - Installing 6 GB of RAM

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Hi LinuxSupahFly,

The memory support depends on the chipset on the motherboard and the Intel 945G Express Chipset supports only 4GB. Updating the BIOS to the latest version will not remove the limitation. For information on the Intel 945G Express Chipset memory controller, please visit the following link:
http://intel.ly/R5SMbF

Thanks and Regards,
Rajath N
Dell Social Media and Community Professional
Order Status : http://dell.to/1fgKSTr
Download Drivers : http://dell.to/1hcxG98

Seann1
Phosphor

Re: Using DELL Optiplex GX620 - Installing 6 GB of RAM

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... I guess there's no way to change that unless I get a new mainboard? No "magic flash" solution from Intel?

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Seann1
Phosphor

Re: Using DELL Optiplex GX620 - Installing 6 GB of RAM

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Does it matter that my board doesn't have the integrated graphics adapter?

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Re: Using DELL Optiplex GX620 - Installing 6 GB of RAM

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Hi Seann,

Thank you for your reply and you can install more that 4GB RAM by changing the mainboard. You will need to purchase a standalone Graphics Card if the mainboard does not have integrated graphics and does not affect the memory.

Thanks and Regards,
Rajath N
Dell Social Media and Community Professional
Order Status : http://dell.to/1fgKSTr
Download Drivers : http://dell.to/1hcxG98

Seann1
Phosphor

Re: Using DELL Optiplex GX620 - Installing 6 GB of RAM

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I do already have a 1 GB stand-alone PCIE nVidia card that has been working nicely for the last year. I was simply hoping to avoid needing to replace the mainboard, but I see now that's the only way I'll be able to use the full 6 GB I have installed.

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Uranium

Re: Using DELL Optiplex GX620 - Installing 6 GB of RAM

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The 620 supports 8 gigs of ram Max based on the Motherboard , 4 Ram slots and the CPU being EMT64 aka 64 bit cpu. 6 Gigs would be possible using a pair of 2 Gig modules and a pair of 1 Gig modules. There are 4 slots total. How much memory your Windows OS will recognize depends on which version of Windows you are running. 32-bit versions of Windows will see (and utilize) only 3GB or 3.5GB. To utilize more memory, install a 64-bit version of your OS.  You never recover the frame Buffer so the total is always LESS THAN 4 or LESS THAN 8 Gigs Total Ram Even if you install a PCI-E video card. Not all Pentium 4 processors support EMT64.  Since Intel reserves 512 megs you will not see 4 gigs with a pair of 2 gig modules because the system does not remap the unused ram up higher.



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Seann1
Phosphor

Re: Using DELL Optiplex GX620 - Installing 6 GB of RAM

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But I'm using Ubuntu 12.10 x64, as I stated earlier. I am familiar with the limitations of 32 bit OS RAM recognition. According to Intel's own specs (http://intel.ly/R5SMbF), the 945 chipset is limited to 4 GB. I have two 2s and two 1s installed. Ubuntu x64 says there is only 4 GB installed, but recognises that I have 4 slots totalling 6 GB.

From Intel:

Memory Specifications
Max Memory Size (dependent on memory type)
4 GB
Memory Types
DDR2-400 /  DDR2-533 /  DDR2-667
# of Memory Channels
2
Max Memory Bandwidth
10.7 GB/s
Physical Address Extensions
32-bit
ECC Memory Supported
No

From my Ubuntu install (http://bit.ly/14vFqLZ):

seann@seann:~$ dmidecode --type memory | grep -E "(Size|Maximum.Capacity)"
Maximum Capacity: 4 GB
Size: 2048 MB
Size: 1024 MB
Size: 2048 MB
Size: 1024 MB

seann@seann:~$ free -m
            total  used  free  shared   buffers   cached
Mem:        3513   3328  185   0        373       2083

                   used  free
-/+ buffers/cache: 870   2642


            total  used  free

Swap:       3907   4     3903

As you can see, I am no novice, and as such, I am inclined to go with the first answer I was given. I know all of what you're saying, but your answer doesn't jive with the information I have already been given, sourced, referenced, and verified. I thank you for your interest and desire to help me, but I'm sticking with the first answer, which is that the Intel 945 chipset is capped at 4 GB due to it's 32-bit addressing scheme, and flashing the BIOS won't help.

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BailDL632
Copper

Re: Using DELL Optiplex GX620 - Installing 6 GB of RAM

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I've got the 32 bit Windows Operating System. Will the 4X1GB PC2-5300 maximize my SDRAMM capabilities of my GX620. I have studied the math involved in getting bus speeds, derived from a multiplier that is  (if I'm not mistaken) a fixed value controlled by the processor or chipsets depending on the amount of SDRAMM installed. I understand the basic math. My Processor is 3.06 GHZ. My bus speed (as shown in BIOS is 533 MHZ (is this a fixed value of the memory installed which is currently PC2-4200). If I put four modules in each slot the bus speed will be divided by four (quad pumping?) running each module at 133MHZ. I believe the clock speed of the PC2-5300 to be 667MHZ which would run each at 166MHZ. Will my processor divide correctly the 667MHZ clock? It is an EM64T.   I am assuming that the 64 bit processor that is in the system will only transfer 32 bits per quarter cycle. I'm not sure about this if you can possibly clarify this as a fact. By the answer I'm replying to I see that you suggest that Windows 32 bit will only recognize 3 or 3.5 GB. I assume that would be with matched 2X1GB and 2X512MB to make the 3GB. How would I achieve 3.5GB? I assume again by installing the 4X1GB and the operating system will run at its limit of 3.5GB? If you can help clarify any of my ramblings here I would sure appreciate it!

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rdunnill
Iridium

Re: Using DELL Optiplex GX620 - Installing 6 GB of RAM

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The most I could get mine to recognize was about 3.5gb, even with a 64-bit OS.

It has a matched 2 x 2gb pair of G.SKILL PC6400 installed. With four sticks installed, it would not  boot.

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