Luisenor
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RE: 4 GB Ram Upgrade problem - OptiPlex 780 Desktop ..

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Originally I had 2 x 2GB 2Rx8 PC3-8500U (Kingston) on my Optiplex 780 running Windows 7 Ultimate.

Two weeks ago I bought 4 x 4GB 240-pin DDR3 PC3-10600 1333MHz from MrMemory.co.uk (see below).

I tried to install the new RAM (still on Bios A01) attempting with the individual 4 GB modules and all four together, but it didn't work and in all cases I was getting diagnostic lights 1 & 3 ON.

After updating to Bios A15 and the other recommended Dell drivers (perhaps the latter were not needed) I managed to get my machine working with 16 GB. What a relief! According to the Bios, the new RAM is working at 1066MHz though.

I didn't change any default configuration in the new Bios A15, and I didn't have to change the original motherboard or the power unit (300W) as other people claim did. Perhaps I am just lucky :-)

Best wishes,

Luis


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rbrown5055
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RE: 4 GB Ram Upgrade problem - OptiPlex 780 Desktop ..

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My solution copy pasted from another topic about this issue:

Hey guys, I just bought 2x 4gb's of ddr3 10600, for my Optiplex780MT  and at first it wasnt working. Doing a bit of a search made me start to get a little pissed off but this board does take DDR3 10600, hell it already had 2x 2gb sticks of DDR3-10600 in it and worked fine. That didnt stop it from not booting when i put in the new RAM. A bit of trouble shooting and I was able to fix this problem, rather simply.

First upgrade the bios, to A15, mine was still on A01. Download it from the dell downloads page, then run it as an administrator.


When the update is finished, turn off the computer, unplug it, open the case. Hit the power button again to drain power until the LED's go out

Install the new RAM. Shut everything up, plug in the computer and power on.


Viola, that's what i did, you now need to enter bios because the configuration has changed, be sure to check the HDD AHCI/ATA/RAID to the correct setting, updating the bios set the default to RAID, I put it back to AHCI auto detect once i figured out why windows wasnt starting.

That's pretty much it, now running 8 gigs of PC3 10600 1333Mhz that its clocking down to 1066mhz.

So you know, it was running with the A01 Bios on 2x2gb of:  hynix 2gb 2rx8 pc3-10600u-9-10-b0 (HMT125U6TFR8C-H9 N0 AA     1031) I dont know for sure, but i assume you could use 4 2 gbs easily and this stuff is pretty cheap on ebay

Now it is running with A15 Bios on: 2x4gb Crucial ct2kit51264ba1339 -- This is no longer available on their site and is possibly discontinued but I got it new w/ lifetime warranty on amazon for 84 shipped with tax, and its on newegg too for 90.

Anyway hope this is helpful, just waiting now for the hdd, vid card and psu to arrive to hopefully turn this freebie computer into a relatively decent machine.

I just bought this exact RAM for my Optiplex 780, 2x4gb Crucial ct2kit51264ba1339.  I followed these instructions exactly.  And... no joy. :-(  The machine will not boot.  I get some beeps, and lights #3 and #4 come on.

Please help, what am I doing wrong???  This is *so* frustrating!

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rbrown5055
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RE: 4 GB Ram Upgrade problem - OptiPlex 780 Desktop ..

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Ok, after some playing around with switching memory modules in and out, I did manage to get *one* of the memory modules to work.  I suppose it's possible that there is a problem with the other memory module, and I plan to contact the seller to see if I can get a replacement. I'm just afraid it will turn out to be the 780. :-(

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svanwormer
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RE: 4 GB Ram Upgrade problem - OptiPlex 780 Desktop ..

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Has anyone had any luck running 12800 RAM in the 780, even with the latest BIOS A15? What did the OP BYQ end up running in his 780? 10600? I bought 12800 RAM kinda by accident so not sure if it's gonna work or if I'll have to return it.

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mikerigsby
1 Copper

RE: 4 GB Ram Upgrade problem - OptiPlex 780 Desktop ..

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RAM speed is less an issue than RAM amount because your 12800 will probably simply run at 10600 at worst. It should still work just fine.

svanwormer
1 Nickel

RE: 4 GB Ram Upgrade problem - OptiPlex 780 Desktop ..

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Well I snapped in 1 stick of the ddr3 1600 12800 (into DIMM 1), plugged the power cord into the back and got the dreaded RAM error beeps. Oh well, guess I'll just return it a and buy some 10600. Thanks.
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BYQ-
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RE: 4 GB Ram Upgrade problem - OptiPlex 780 Desktop ..

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This is a late replay .. sorry about this .. 

Just for the benefit for you guys .. 

I bought a DDR3-1333 PC3-10600 4x2GB from the cheap good quality company .. TwinMos .. it works fine for me finally.. 

please note that each slot will handle 2 GB maximum .. don't buy other than this specific Ram or you will lose time and money .. even after update the bios to the latest!

Have a good day,

Yousif

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svanwormer
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RE: 4 GB Ram Upgrade problem - OptiPlex 780 Desktop ..

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I did read somewhere that they were able to run 16 GB (4 x 4GB) with the A15 BIOS, so I ended up buying 2 x 4GB 10600 sticks, so I will update when they arrive. Thanks for the help!

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DallasFlier
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RE: 4 GB Ram Upgrade problem - OptiPlex 780 Desktop ..

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The ram is too slow DDR3 PC3-10600 (1333Mhz) VS DDR3 PC3-12800 (1600Mhz)

Sorry, but I don't believe that is correct.  I also have an Optiplex 780 MT, and I'm reading this straight from the Dell service manual as regards memory specifications:
Memory
Type DDR3 SDRAM (non-ECC memory only)
Speed 1067 MHz
Connectors four
Capacity 1 GB, 2 GB or 4 GB non-ECC
Minimum memory 1 GB
Maximum memory 16 GB
 
So, if the official service memory calls out 1067 MHz DDR3, there's no way that 1333 MHz DDR3 can be "too slow."
In addition, when I bought my Optiplex 780 MT used, it had 4 2GB sticks in it.  According to CPU-Z, 2 of the sticks are PC3-10700, and the other 2 are actually PC3-8500 - and the machine works just fine with that combination of memory installed.  I know the PC3-8500 is officially "too slow", but it works fine, albeit running slower, I'm sure.
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DallasFlier
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RE: 4 GB Ram Upgrade problem - OptiPlex 780 Desktop ..

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This is a late replay .. sorry about this .. 

Just for the benefit for you guys .. 

I bought a DDR3-1333 PC3-10600 4x2GB from the cheap good quality company .. TwinMos .. it works fine for me finally.. 

please note that each slot will handle 2 GB maximum .. don't buy other than this specific Ram or you will lose time and money .. even after update the bios to the latest!

Have a good day,

Yousif

Sorry, but this is incorrect.  Each slot will handle up to 4GB memory modules, as confirmed by the official Dell Service Manual for the Optiplex 780.