prowla
1 Copper

Re: 16GB Ram (4x4gb) Supported? Optiplex 755 and XPS 420

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Doh! my extra 2x 4GB arrived yesterday, but one of them was faulty.

So Now I've got 14 GB in my 755 SFF (3x 4GB and 1x 2GB).

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devilstaco
1 Copper

Re: 16GB Ram (4x4gb) Supported? Optiplex 755 and XPS 420

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I am pleased to report that the Optiplex 755 USFF supports 4GB RAM in each slot. 

Two of the 4GB Patriot RAM sticks suggested by SpeedStep with the A19 version of the BIOS is working perfectly. 

Thanks again everyone for your quick input!

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prowla
1 Copper

Re: 16GB Ram (4x4gb) Supported? Optiplex 755 and XPS 420

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Good stuff.

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Highlighted
alvinkhorfire
1 Nickel

Re: 16GB Ram (4x4gb) Supported? Optiplex 755 and XPS 420

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Did anyone test 16GB Ram (4x4gb) on XPS 420?

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shellybird
1 Copper

RE: 16GB Ram (4x4gb) Supported? Optiplex 755 and XPS 420

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How can I tell if my 755 has the A20 Q6600 CPU

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7 Plutonium

RE: 16GB Ram (4x4gb) Supported? Optiplex 755 and XPS 420

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shellybird

Use the following free utility:

http://www.cpuid.com/softwares/cpu-z.html

Bev.

 

 


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Forum Member since 2001
I am not employed by Dell

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huntmorgan70
1 Copper

RE: 16GB Ram (4x4gb) Supported? Optiplex 755 and XPS 420

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It would say that you have 16GB of RAM installed but only 8GB is usable

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speedstep
6 Thallium

RE: 16GB Ram (4x4gb) Supported? Optiplex 755 and XPS 420

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You never get 16 or 8 but rather 16 or 8 minus the video frame buffer stolen from system ram.

IF its the correct ram and you have EMT64 cpu AND 64 bit os it works fine.  The correct NON BUFFERED, NON REGISTERED, NON ECC ram is not available anymore.Only the models that have no onboard intel video like the precision 380 etc allow all 8 gigs to be used when you use 2 gig ddr2 modules.


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BillMoy
1 Copper

RE: 16GB Ram (4x4gb) Supported? Optiplex 755 and XPS 420

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1.)  I was so happy that GzBz reported that 16gb ram was working on Optiplex 755

2.) I just tested 12gb on my own 755 using 2x4gb - Crucial 4gb, 240-PIN UNBUFF DIMM 512MX64 DDR2PC2 - 5300  --  CT51264AA667  --  1856928

and 2x2gb  -  EDGE 2GN581608


Can't wait to try 16gb (or more???)


3.) Really not happy that Dell Specs officially max 755s with 8gb.  I was not able to research an answer to know what specifically limits the max ram a motherboard can use... anybody knows??

--Bill

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RoHe
6 Indium

RE: 16GB Ram (4x4gb) Supported? Optiplex 755 and XPS 420

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3.) Really not happy that Dell Specs officially max 755s with 8gb.

You have to remember PC makers can only test systems with what's available at the time of  manufacture. Back when this system was being developed, large RAM modules probably weren't even available or so expensive users wouldn't buy them... And once a spec is set for the model, they don't typically change it.

Ron

   Forum Member since 2004
   I am not a Dell employee

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