I have an optiplex 745 with 2GB of memory.
I wanted to upgrade, so I used my service tag to find the correct memory for my machine and then I ordered the dell recommended memory for my machine.
I got the memory but the machine won't boot with it installed. I call tech support and they claim that they memory won't work on my machine. I check dell.com, kingston, corsair and they all list 2GB 800Mhz memory for the optiplex 745 but when I read the docs for the 745 (every form factor) it says that it doesn't support 2GB 800Mhz memory. Its weird dell recommends it for my machine and other companies all suggest 2GB 800Mhz for my machine. Anyone get this type of memory to work on this machine? The lady from dell recommended I exchange the 2GB for 2x1GB sticks instead, I only have 32-bit xp so I will only see 3-4GB of memory at the most.
I have the latest bios 2.6.3 installed.
Your machine may not support 1x2GB sticks, you should consider returning it and buying a 2x1GB DDR2 kit.
The speed 800MHz will not affect you, it will downclock to the right speed.
From the Optiplex 745 specifications "NOTE: 2-GB 800-MHz memory modules are not supported", with the exception of the Ultra SFF Optiplex 745, where 2gb modules are supported.
<ADMIN NOTE: Broken link has been removed from this post by Dell>
I guess part of my problem is the docs contradict themselves.
<ADMIN NOTE: Broken link has been removed / replaced from this post by Dell>
If you click memory specifications then you find out that no model of the 745 supports 2GB 800Mhz. The Ultra SFF doesn't support 800Mhz at all. If I go to dell.com and go to memory selector and type my service tag then it lists 2GB 800Mhz as a valid option. Then if you go to kingston.com or corsair.com (or any memory vendor) and use the memory configuration on those pages, you get 2GB 800Mhz as being a valid option for the optiplex 745. So it appears the docs are wrong BUT I bought 2x2GB dimms and my machine won't boot at all (even with the latest BIOS), so it appears the docs are right but its kinda weird none of these companies realize that this memory doesn't work on an optiplex 745.
I met a weird problem with a 745 arrived today. form desktop.
It mounts 2x512mb ddr2 memory
I put inside, in slot 1 and 2 2x256mb DDR2 (that fits on a GSX280) and the pc won't boot, with led 1-3 lit.
i put 2x1gb kingston kvr400d2n3/1g and it doesnt power up.
Where is the problem?
I would like to have 2x1gb + 2x256 inside
I have installed the memory that were with the pc, 2x512mb 667 DDR2 and they works.
2x256 333 doesn't work
2x1gb 800 doesn't work
i will install the suggested kingston model (also dell replacement) 2x1gb 667
Then it would appear that other memory modules are not compatible with your system.
For memory that's certified to be compatible, go to www.crucial.com and use either Crucial's Scanner Tool, or their Memory Advisor Tool.
FWIW I have a Dell Optiplex 745 Desktop model and have successfully installed two Dell 2GB DDR400 memory modules (installed in the white sockets).
My system recognizes 4GB of RAM.
My BIOS is 2.6.4