Optiplex 745 Memory Question

Question

I'm considering purchasing an Optiplex 745 and was wondering if I have to select memory of a certain speed to run in dual channel memory mode.  It comes with the options of 566, 667, and 800 MHz speeds. TIA.

DELL-Jesse L · Answer

juno5000,

Thank you for using the Dell Community Forum.

Looks like if you use 1 stick of 512 memory it will run single channel. Here are the memory specs.

Memory
Type 533, 667 MHz DDR2 SDRAM
Memory connectors 2
Memory modules supported 256 MB, 512 MB, 1 GB, or 2 GB non-ECC
Minimum memory Dual-channel: 512 MB
Single-channel: 512 MB (single stick)
Maximum memory 4 GB
BIOS address F0000h

juno5000 · Answer

Thank you for your reply. I would like to run in dual-channel memory mode but what is the minimum speed memory I need to enable dual channel memory: 533, 667, or 800 MHz? Sorry for the confusion.

Also, I checked the online specs for the Optiplex 745 but it states that there are four memory connections, not two like you posted. Is this a mistake?

Here is link to the specs ...

<ADMIN NOTE: Broken link has been removed from this post by Dell>

Message Edited by juno5000 on 02-23-2007 03:49 PM

Dev Mgr · Answer

Dual channel only requires 2 or 4 dimms. It isn't dependent on the speed of the memory. It will obviously only run at the speed of the slower dimm.

Aczarto · Answer

I have a similar question:   I have an Optiplex 745 with a Core 2 Duo E6600 CPU. So, this CPU runs at 2.4Ghz, with a 1066Mhz FSB.  However, the bus speed of the system is only 266Mhz (so the main bus is quad-pumped up to 1066Mhz into the CPU.  266x4 = 1066Mhz).   So, therefore, the fastest DDR2 ram I should use is DDR2-533 (266mhz x 2 = 533mhz).   My question is, under what circumstances would one use DDR2-800 ram on this system?  To take advantage of the DDR2-800 you would need to be running a 400Mhz system bus.  Does the motheboard even support this???  What CPU do you need in there so that the 400Mhz bus is enabled??

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Optiplex 745 Memory Question

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