Optiplex 780 Sff is there a way to run 1600mhz ram?

[marcusmulvena11]

Hey guys i was wondering if theres a possibility to make 8x2gbs of ddr3 1600 ram work with A15 bios? currently i have 4x2gbs of ddr3 1066mhz.

 

[william p]

The RAM will run at 1066 speed no matter what. It can run up to 16GB low density DDR3. 1333, or 1600 modules will run at 1066 speed.

 

[marcusmulvena11]

The RAM will run at 1066 speed no matter what. It can run up to 16GB low density DDR3. 1333, or 1600 modules will run at 1066 speed.

 

[marcusmulvena11]

So I have bought some ram that is 1600 and whenever I put the ram in my computer beeps. Probably about 6 times. And the lights that show up are 1+3. Is there a way so I can use the ram at 1066, all I’m trying to achieve is having the 16gbs of ram

 

[william p]

Best guess is that it's cheaper x128 type "AMD" RAM. Dells require low density x64 modules. There are no user settings. The RAM modules contain settings to run at lower speed if needed. Crucial.com sells DDR3 1600 for those systems. But DDR3 1333 is the type most commmonly used just because it's been available for so many years.
https://www.crucial.com/usa/en/compatible-upgrade-for/Dell/optiplex-780-desktop

 

[marcusmulvena11]

Best guess is that it's cheaper x128 type "AMD" RAM. Dells require low density x64 modules. There are no user settings. The RAM modules contain settings to run at lower speed if needed. Crucial.com sells DDR3 1600 for those systems. But DDR3 1333 is the type most commmonly used just because it's been available for so many years.
https://www.crucial.com/usa/en/compatible-upgrade-for/Dell/optiplex-780-desktop

So I’m going to have to buy new ram for the computer for it too boot with 16gbs?

 

[william p]

Crucial.com guarantees compatability and has a lifrtime warranty. They're well regarded for new RAM.
Instead of looking at clock speed you can look at CAS Latency for best performance at 1066 speed. I'm running Gskill Ripjaws 2x4GB DDR3 1333 CL9 in my Opti 380. But running at 1066 speed the CAS Latency is 7. Compare this to CAS 11 on generic DDR3 1600 and the loss is not so bad.
Latency is how many clock cycles the memory uses to refresh the data. Lower is better and it's just as important as clock speed.
Unfortunately this spec isn't published for the lower clock speeds. But DDR3 @1066 CL7 is a good goal for that computer.

 

[marcusmulvena11]

Crucial.com guarantees compatability and has a lifrtime warranty. They're well regarded for new RAM.
Instead of looking at clock speed you can look at CAS Latency for best performance at 1066 speed. I'm running Gskill Ripjaws 2x4GB DDR3 1333 CL9 in my Opti 380. But running at 1066 speed the CAS Latency is 7. Compare this to CAS 11 on generic DDR3 1600 and the loss is not so bad.
Latency is how many clock cycles the memory uses to refresh the data. Lower is better and it's just as important as clock speed.
Unfortunately this spec isn't published for the lower clock speeds. But DDR3 @1066 CL7 is a good goal for that computer.

i get what you're saying, right now i have bought from timetec are the 8G DDR3L 1600 CL11 1.35V 2Rx8 Sticks. i would need 8x2Gb of DDR3 1066 CL7? Not CL11 Correct?

 

[william p]

The 780 only has 4 RAM slots so 4x2GB DDR3 x64 modules. The CL11 1500modules will very likely tighten up the timings when running at 1066 speed. Very likely to CL7. You can run a program like PC Wizard, CPUZ, or HWinfo 64 to see what you're getting. 2Rx4 and 2Rx8 are specs. usually used for servers and have more to do with how the data is arranged than the chips used, although it's related. I wouldn't buy anything the seller doesn't say will run on an Optiplex 780.
If they don't know this but from someone who does.

 

[marcusmulvena11]

The 780 only has 4 RAM slots so 4x2GB DDR3 x64 modules. The CL11 1500modules will very likely tighten up the timings when running at 1066 speed. Very likely to CL7. You can run a program like PC Wizard, CPUZ, or HWinfo 64 to see what you're getting. 2Rx4 and 2Rx8 are specs. usually used for servers and have more to do with how the data is arranged than the chips used, although it's related. I wouldn't buy anything the seller doesn't say will run on an Optiplex 780.
If they don't know this but from someone who does.

Hey, I was wondering if this ram would work, https://www.amazon.ca/Komputerbay-P...dpPl=1&dpID=51ec-vb6aUL&ref=plSrch&th=1&psc=1 would I need 4x4gbs of for my machine to get 16gbs or would 2x8gbs work?

 

[william p]

4x4 is the way to go. It's actually twice what they originally supported. It's possible that 8GB modules exist that will run in that, but no one seems to know which ones. Most of them will be x128 high density which won't work.

 

[gskill support]

You need two of these:

https://www.newegg.com/Product/Prod...l 424&cm_re=gskill_424-_-20-231-424-_-Product

Memory capability mainly depends on CPU, but in this case I don't think any spec had DDR3-1600 or 1.35V capability so the RAM above is exactly what you need.