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Navaros
Bronze

Optiplex 780 & 8GB DDR2 800MHz?

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Hi!

I'm the owner of an Optiplex 780 with 2GB DDR3 @ 1066MHz. I have 8GB (2GBx4) DDR2 @ 800MHz from an older computer, can I use DDR2 memory in this machine? Could DDR3 @ 1600MHz dimms works too?

Thanks.

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DELL XPS M1330 Black
Intel Core 2 Duo T9300 2.5GHz, 4GB DDR2 667MHz, 250GB HDD, nVidia 8400M GS 128MB GDDR2

DELL Optiplex 755 MT
Intel Core 2 Quad Q9650 3.0GHz, 8GB DDR2 800MHz, 320GB HDD, ATI HD5670 1GB GDDR5

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17 Replies
RobinBredin
Diamond

Re: Optiplex 780 & 8GB DDR2 800MHz?

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Hi navaro's, Having looked at your manual HERE, it says you can only use the DDR3 1067MHz.

 

      

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Re: Optiplex 780 & 8GB DDR2 800MHz?

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The advice Robin gave is correct.

DDR2 won't physically fit into a DDR3 slot, so unfortunately no. Even if the Dell documentation didn't specify, that alone would nullify the possibility.
As far as DDR3 1600MHz RAM: the board will, at most, support 1067MHz. The 1600MHz RAM, even if recognized by the board, wouldn't run at 1600MHz. Most probably though your Dell wouldn't POST with the 1600MHz RAM installed.

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Inspiron Micro Desktop (mid 2015)- Celeron, 4GB, 32GB eMMC
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Navaros
Bronze

Re: Optiplex 780 & 8GB DDR2 800MHz?

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Thanks for the replies.

The fact is this, I can get 1066 and 1600 MHz DDR3 memory from the same brand, model and specifications at the same price. My question is: Can I use 1600 MHz memory working @ 1066 MHz in this computer? I think could be more useful the 1600 MHz memory to reuse it in the future.

Thanks.

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DELL XPS M1330 Black
Intel Core 2 Duo T9300 2.5GHz, 4GB DDR2 667MHz, 250GB HDD, nVidia 8400M GS 128MB GDDR2

DELL Optiplex 755 MT
Intel Core 2 Quad Q9650 3.0GHz, 8GB DDR2 800MHz, 320GB HDD, ATI HD5670 1GB GDDR5

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Re: Optiplex 780 & 8GB DDR2 800MHz?

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You can only if you leave at least one of the 1066MHz chips in. If you use all 1600MHz then they won't down-clock to the 1066MHz speed otherwise.

Dell Community Rockstar - Platinum

Alienware 13 (late 2014) - Core i5-4510u, 12GB, 480GB PNY XLR8 SSD, nVidia 860M, Graphics Amp: PNY GTX 960
Inspiron 11-3162 - Celeron, 2GB, 32GB eMMC

Inspiron Micro Desktop (mid 2015)- Celeron, 4GB, 32GB eMMC
Venue 8 Pro - Red edition, Intel Atom Z3740D, 2GB, 32GB
2x S2230M 21.5" - 1080p LED monitor

Feel free to call me Greggers

Other: iPhone 5S, iPad Air, Mac mini
Retired & Donated to charity: Inspiron 530, Inspiron Mini 10, Inspiron M5030 (donated to mom, she's a charity case [Smiley Tongue]), XPS 720 Red & Silver

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Navaros
Bronze

Re: Optiplex 780 & 8GB DDR2 800MHz?

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So, if I want 8GB I must get 1066 MHz memory because 4 dimms 1600 MHz won't work, Am I wrong?

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DELL XPS M1330 Black
Intel Core 2 Duo T9300 2.5GHz, 4GB DDR2 667MHz, 250GB HDD, nVidia 8400M GS 128MB GDDR2

DELL Optiplex 755 MT
Intel Core 2 Quad Q9650 3.0GHz, 8GB DDR2 800MHz, 320GB HDD, ATI HD5670 1GB GDDR5

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Re: Optiplex 780 & 8GB DDR2 800MHz?

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No, you are correct. You will need 8GB (4 sticks of 2GB) of 1066MHz.

Dell Community Rockstar - Platinum

Alienware 13 (late 2014) - Core i5-4510u, 12GB, 480GB PNY XLR8 SSD, nVidia 860M, Graphics Amp: PNY GTX 960
Inspiron 11-3162 - Celeron, 2GB, 32GB eMMC

Inspiron Micro Desktop (mid 2015)- Celeron, 4GB, 32GB eMMC
Venue 8 Pro - Red edition, Intel Atom Z3740D, 2GB, 32GB
2x S2230M 21.5" - 1080p LED monitor

Feel free to call me Greggers

Other: iPhone 5S, iPad Air, Mac mini
Retired & Donated to charity: Inspiron 530, Inspiron Mini 10, Inspiron M5030 (donated to mom, she's a charity case [Smiley Tongue]), XPS 720 Red & Silver

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Navaros
Bronze

Re: Optiplex 780 & 8GB DDR2 800MHz?

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OK, thank you very much.

∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞∞

DELL XPS M1330 Black
Intel Core 2 Duo T9300 2.5GHz, 4GB DDR2 667MHz, 250GB HDD, nVidia 8400M GS 128MB GDDR2

DELL Optiplex 755 MT
Intel Core 2 Quad Q9650 3.0GHz, 8GB DDR2 800MHz, 320GB HDD, ATI HD5670 1GB GDDR5

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cswinings
Copper

Re: Optiplex 780 & 8GB DDR2 800MHz?

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You can use 4GB sticks in  a 780 but you need to update BIOS to A05, and 1333 and 1600 both clock down to 1066... its a MB/Chipset limitation

JM99
Silver

Re: Optiplex 780 & 8GB DDR2 800MHz?

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Okay, now I'm TRULY confused - you said he can use 1600 *IF* he leaves in some of the 1066 sticks, so your own answer is wrong - you said, "No, you are correct. You will need 8GB (4 sticks of 2GB) of 1066MHz."

But, from  your earlier answer, it seems that he could have 2 x 1066 2GB sticks; and 2 x 1600 2GB sticks, for a total of 8GB, and it would down-clock to the lower memory speed - right?

If so, then NO, he does not have to get 4 x 8GB 1066; he can get 2x1066 and 2x1600.

I'm with him - I am seeing some REAL deals on the 1600 memory, and I could care less if it down-clocks, I just need the extra memory - plus, he make an excellent point about using it in future upgrades - great way of thinking ahead!