Question about Dell OptiPlex GX620 PC Desktop

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Unsuccessful memory upgrade

I've got this small form factor Dell Optiplex GX620 and I wanted to upgrade the memory from a pair of 512 MB simms to a single 2GB dimm. The existing memory was 533 MHz (PC 4200) so I figured I could just buy anything faster than that and under-clock it.

I ended up buying a 2GB strip of 800 MHz (PC 6400) memory for $30, and installed it. The system appeared to boot just fine, but when I try to log into windows, the system hangs for a moment, and then gives me a series of errors before starting a shutdown timer and rebooting.

Does anyone know if this is related to the memory speed being too fast, just some configuration problem, or something else?



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Memory must be installed in pairs.

Posted on Dec 19, 2008

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I work on GX 620 dells alot. I work on them for a school district.

They have alot of issues. Particularly with memory issues, try reseating the memory or trying a different memory slot. You shouldnt have to under clock it. Just run it as normal.

If it beeps on start up, then its probably a memory problem. The dell website has online support and will give you a list of dell beep codes

you can type in your dell service tag number located on the back, or just picking out the model.

Try using just using the new memory stick by itself without the old ones.

If your computer came with a disk ( it should) It either Blue or Black, if its black, boot from cd and it will load a test program, try using that to check that the memory is good. If its blue then its older and just lets you re-install windows.

If its looping, where it gives you a black screen with options to boot in safe mode but restarts no matter what option you pick.

Load the windows cd like your going to re-install, Boot from cd ( F12 ) on boot, pick boot cd drive and when it loads, pick ( R) for repair and when it goes to command prompt, type in. ( chkdsk C: /p ) exactly like that

it will run a repair. When done, type EXIT and hit enter.

When it restarts, remove the disk and see if it gives you the option again to pick how to start windows.

Pick ( star windows normally ) see if this works.

If the repair works then it wasnt the memory as much as it was just Dells Crappy hardware configuration.

Let me know what happens and i can try to help you further.

It could be a bad memory stick that you happened to get.

Good luck.

Posted on Mar 31, 2008


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Below are the specs you requested on these 2 systems.
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then unfortunately, with the small form factor case that is used with this particular version of the Optiplex GX620, the motherboard doesn't have any expansion ports to be able to install a PCIe card. Here is a picture of the small form factor case with the side panel off of it so you can see how little room is left in the case after all of the components are installed.
As I am not familiar with what you are trying to accomplish or why you need a firewire card installed, I can only make a small suggestion, such as looking for a firewire to USB adapter for whatever you are trying to connect to your computer. If you are able to expand on what you are trying to accomplish, or what kinds of problems you are having, I would happy to try to lend you my expertise. :-) I hope this helps.


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Let's begin by providing a link to the User Manual. This page has a link to view it on-line or download it. Your choice.

GX620 Manuals

Now for the cover. You don't say what form factor you have. (There are 4.)

If you go to this page and go to the bottom, there are 4 links corresponding to each of the form factors that give instructions for removing the cover.

GX620 Before You Begin

Also keep in mind that your computer has a Chassis intrusion switch. Once you remove the covers you will need to reset it. Instructions are at the bottom of this page:

GX620 Chassis Intrusion

That should get you going. If you use the on-line manual, just bookmark it for future use.

Thanks for using Fixya.

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Please enter the service tag on and find the manual and the right memory for your PC

All the best!

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Memory Type
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