Optiplex Desktops

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780, CPU upgrade

I have an Optiplex 780 with an E8400 processor, running Windows 7 with 4 gb on RAM. I am looking to upgrade the processor to something faster, and upgrade the RAM to 8 GB. Can anyone recommend a good processor? Thanks!

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Hi starduster31,

The 780 has an Intel Q45 chipset which supports the following CPUs: 

http://www.cpu-upgrade.com/mb-Intel_(chipsets)/Q45_Express.html

The highest spec of CPU that Dell shipped with the 780 was the Q9650 so anything from that list, up to and including the Q9650 should be fine. 

As far as the memory is concerned, it will take up to 16GB (4x4GB) of Non-ECC dual-channel 1066MHz or 1333MHz DDR3 SDRAM 

* To fully utilize 4GB or more of memory requires a 64-bit enabled processor and 64-bit operating system.

 

 


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any core extreem for microsprocessor ? and ram 16GB for 1 slot (16gbx1) can used its?

 

It's a 'no' to both questions.  Max CPU for the 780 is Q9650 (if you don't have the USFF) and RAM can only be a max of 4GB per DIMM for a total of 16GB (except the USFF).

USFF = 8GB max ram & top CPU = Intel® Core™ 2 Duo E8600

Speedstep already had answers in this thread.




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DELL™ OPTIPLEX™ 780  TECHNICAL GUIDEBOOK V2.0  Intel Q45 Express Chipset w / ICH10DO
Depends on which size you have MT  DT SFF USFF

Recommended Ram is VERY specific.  The spec says that 4 gigs is max for USFF but this is not correct.

https://www.amazon.com/Timetec-1600MHz-PC3L-12800-Unbuffered-Computer/dp/B00IV19IA8/

Timetec Hynix IC 8GB Kit (2x4GB) DDR3L 1600MHz PC3L-12800 Non ECC Unbuffered 1.35V/1.5V CL11 2Rx8 Dual Rank 240 Pin UDIMM

 

http://i.dell.com/sites/doccontent/business/solutions/engineering-docs/en/Documents/optiplex-780-tec...

The USFF has tiny power supply so it cannot use 95W or higher cpu's

Intel® Core™ 2 Quad Q9650/3.00GHz, 12M, 1333FSB
Intel® Core™ 2 Quad Q9550/2.83GHz, 12M, 1333FSB
Intel® Core™ 2 Quad Q9400/2.66GHz, 6M, 1333FSB
Intel® Core™ 2 Quad Q8400/2.66GHz, 4M, 1333FSB
Intel® Core™ 2 Quad Q8300/2.50GHz, 4M, 1333FSB

Don't be fooled by the Mhz Myth however.

Very little if any difference between these standard cpus

Intel® Core™ 2  Duo E8600/3.33GHz, 6M, 1333FSB
Intel® Core™ 2  Duo E8500/3.16GHz, 6M, 1333FSB
Intel® Core™ 2  Duo E8400/3.0GHz, 6M, 1333FSB
Intel® Core™ 2  Duo E7600/3.06GHz, 3M, 1066FSB
Intel® Core™ 2  Duo E7500/2.93GHz, 3M, 1066FSB

 

Supported CPU'sSupported CPU's

 

 


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Sorry I took so long to answer, I really appreciate your suggestions. Is there a power supply that will fit inside the SFF case? It uses the 235W power supply that looks like an L in shape. Thanks again for all your help!!

so no nothing faster than core2 duo E8600 3.3GHz is possible in the optiplex 780 USFF?

this 780 USFF runs very cool now with new thermal compound .. is overclocking possible/advisable?


http://i.dell.com/sites/doccontent/business/solutions/engineering-docs/en/Documents/optiplex-780-tec...

The USFF has tiny power supply so it cannot use 95W or higher cpu's

Intel® Core™ 2 Quad Q9650/3.00GHz, 12M, 1333FSB
Intel® Core™ 2 Quad Q9550/2.83GHz, 12M, 1333FSB
Intel® Core™ 2 Quad Q9400/2.66GHz, 6M, 1333FSB
Intel® Core™ 2 Quad Q8400/2.66GHz, 4M, 1333FSB
Intel® Core™ 2 Quad Q8300/2.50GHz, 4M, 1333FSB

 


I'm thinking to replace the optiplex 780 USFF power supply (180W) with a power supply from the later generation optiplex 7010 (200W) .. it looks like exactly the same form factor .. would that be sufficient to run one of these LGA 775 quad core processors instead of E8600 dual core?  or is there better option using a 775 to 771 adapter?  



I'm thinking to replace the optiplex 780 USFF power supply (180W) with a power supply from the later generation optiplex 7010 (200W) .. it looks like exactly the same form factor .. would that be sufficient to run one of these LGA 775 quad core processors instead of E8600 dual core?  or is there better option using a 775 to 771 adapter?  

this afternoon installed Q9650 quad core to replace the E8600 dual core ..  and working very well with previous upgrades of crucial 2 x 4GB (CT2K51264BD160B) and 200W power supply (200W PSU KG1G0 4GVWP L200EU-00 PS-3201-9DB).  

but the stock A14 firmware at first reported "Alert! Incompatible processor detected .. halted" .. so modified A15 firmware was required:

https://www.bios-mods.com/forum/Thread-Solved-Dell-Optiplex-780-Quad-Core-Support

https://www.dell.com/support/home/us/en/19/Drivers/DriversDetails?driverId=R257719

 

Hy, i also want to upgrade to a Q9650, do you still have the modifide a15 bios image, or plese explain how you medified it. I allready have a15 bios on it

THX in advance

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