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43457
September 19th, 2015 16:00
New PC3-8500 RAM not working in SFF Optiplex 780
I just bought a pair of 4GB sticks (F3-8500CL7D-8GBRL) for my Dell Optiplex 780 SFF.
The manual says it uses DD3-1066, up to 16GB in 4 slots.
Upon installation and when firing up, there's only beeping and the Dell diagnostic lights of 1 & 3 which indicate: "Memory modules are detected, but a memory configuration or compatibility error has occurred"
I've tried each module individually in each of the 4 slots (so 8 tests) and then the pair in 1-3 and 2-4 (2 more tests). No joy.
When I return the original PC3-10600 memory (1GB + 2GB) everything works fine.
I am on the latest A15 BIOS. Can anybody see why this RAM wouldn't be happy on that MB...?
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kozayagi
3 Posts
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October 30th, 2015 04:00
Actually I did manage to add 8GB to the stock 3GB, so I'm humming along at 11GB now. The memory that worked was Crucial CT2367692. I had to return the other stuff to NewEgg taking a shipping and restocking fee hit.
Lesson learned..... I'll always go to Crucial now... it's a no-brainer, you tell them what machine you have, they guarantee what RAM will work.
http://www.crucial.com/usa/en/optiplex-780-small-form-factor/CT2367692#productDetails
speedstep
11 Legend
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47K Posts
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September 19th, 2015 18:00
PC3 8500 is too slow its not EVER going to work. PC3 10,600 is usually for 1 gig or 2 gig modules and
You need PC3 12,800 to work for 16 gigs you need
http://www.crucial.com/usa/en/compatible-upgrade-for/Dell/optiplex-780-small-form-factor
kozayagi
3 Posts
0
September 19th, 2015 21:00
Thx very much for responding!!
I'm confused though... the official Dell manual and specs actually TELL me to get PC3-8500... Then again there was PC3-10,600 in the Dell that was shipped. And Crucial is recommending PC3-12,800... I'm definitely returning the PC3-8500.
Question:
I already have some PC3-10,600 that came with the PC... 3 GB. If I want to add 8GB do I have to stick to PC3-10,600? If they can't be mixed, am I better off losing the 3GB of PC3-10,600 and buying 2x4GB of PC3-12,800? I thought it all got clocked back to 1066 MHZ?
Thx again - super useful help.
bohica230
1 Message
0
October 29th, 2015 16:00
Koz, what was the outcome? Did you ever get your machine up to 8 gigs? I have 8 gigs in my 780SFF and I am having the same non recognized beep codes when swapping the models to newer 4 gig models. So far I have tried 3 different types.
Patriot PV316G160C9KRD
Patriot PSD38G1333KH
Kingston KVR16N11S8/4
I currently have installed and I am trying to get up to 16gigs. Running to the store is getting old.
2 Samsung M378B5773CH0
1 Micron MT16JTF51264AZ-AG4M1