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Mixing Memory Hi, my machine will not recognize two different memory speeds. I have two older DDR2 500 MB sticks that run at 533 MHz and one newer DDR2 1 GB stick that runs at 667 MHz. The two 533 MHz 500 M sticks work OK together, and the 667 MHz 1 G stick runs OK by itself. However, if you fit the 667 1GB stick and a 533 500 MB stick to give 1.5 GB memory, the PC shows the speed as that of the lowest stick (as expected) but only shows 1 GB memory installed. The machine has two slots and I've tried the memory in both combinations, but it only ever shows 1 GB memory, yet 1.5 GB is fitted. Any ideas?

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You can't install two RAMs with different MHz on a single motherboard. Sometimes it works but, usually one of the RAM gets busted. This is based on my experience though.

Posted on Sep 24, 2009

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2 Answers

How does this computer compare to a Dimension 5000 with same RAM amount and clock speed?


Paulji786,
Below are the specs you requested on these 2 systems.
Optiplex GX280
Memory
Type
400 & 533 MHz DDR2 SDRAM
400 & 533 MHzMemory connectors
small form-factor computer: 2small desktop computer: 4desktop computer: 4small mini-tower computer: 4mini-tower computer: 4
Memory capacities
128 MB, 256 MB, 512 MB, or 1 GB non-ECC
Minimum memory
dual-channel: 256 MBsingle-channel: 128 MB
Maximum memory
small form-factor computer: 2 GBsmall desktop computer: 4 GBdesktop computer: 4 GBsmall mini-tower computer: 4 GBmini-tower computer: 4 GB
BIOS address
F0000h
Dimension 5000
Type 400- and 533-MHz DDR2 unbuffered SDRAM
Memory connectors four
Memory capacities 256 MB, 512 MB, or 1 GB non-ECC
Minimum memory 256 MB
Maximum memory 4 GB
System clock 800-MHz data rate
Memory speed

Thank You,
Dell-Jesse L
Dell Social Media and Communities

Jul 15, 2015 | Dell OptiPlex GX280 PC Desktop

5 Answers

Cannot upgrade memory on my Gateway MX3215


Use Corsair Value Select VS1GSDS533D2.

Aug 17, 2009 | Gateway MX3215 Notebook

3 Answers

Installed 2GB of RAM (2x1GB). Laptop only recognizing 1GB. How do I get Sony Vaio VGN FS 760 to recognize 100% of RAM?


Sony VAIO VGN-FS 760/W supports PC-3200 400MHz and PC2-4200 533MHz DDR2 RAM
Expandable up to 2GB. Please make sure that both RAM Chips are according to the above specification, compatible with yout system and both sticks are the same (make & bus speed). Try using one RAM at a time and swaping RAM slots to see if the amount of memory is shown correctly. Memory is not recognized only when it is not up to the specifiction. If the RAM sticks are ok, the system shoud recognize them.

Let me know if any further clarification/ assistance is required.
Good Luck!
Hope this helps!
CreativeTECH

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1 Answer

Acer aspire m5100, AMD Athlon 64bit x2 dual core processor 5000+ 2.60Ghz. Win Vista Business 64bit. When i upgrade and put more than 3GB of ram into the machine, it turns off the lan and my display driver...


Acer official site says:-
Up to 4 GB DDR2 533/667/800 MHz SDRAM
(dual-channel support on four DIMMs)

Try these bus speeds and for dual-channel support read this article :-

Dual-channel architecture requires a dual-channel-capable motherboard and two or more DDR, DDR2 SDRAM, or DDR3 SDRAM memory modules. The memory modules are installed into matching banks, which are usually color coded on the motherboard. These separate channels allow each memory module access to the memory controller, increasing throughput bandwidth. It is not required that identical modules be used, but this is often recommended for best dual-channel operation. It is possible to use a single-sided module of 512 MB and a double-sided module of 512 MB in dual-channel configuration, but how fast and stable it is depends on the memory controller.

If the motherboard has two pairs of differently colored DIMM sockets (the colors indicate which bank they belong to, bank 0 or bank 1), then one can place a matched pair of memory modules in bank 0, but a different-capacity pair of modules in bank 1, as long as they are of the same speed. Using this scheme, a pair of 1 GB memory modules in bank 0 and a pair of matched 512 MB modules in bank 1 would be acceptable for dual-channel operation.

Modules rated at different speeds can be run in dual-channel mode, although the motherboard will then run all memory modules at the speed of the slowest module. Some motherboards, however, have compatibility issues with certain brands or models of memory when attempting to use them in dual-channel mode. For this reason, it is generally advised to use identical pairs of memory modules, which is why most memory manufacturers now sell "kits" of matched-pair DIMMs. Several motherboard manufacturers only support configurations where a "matched pair" of modules are used. A matching pair needs to match in.

Good luck

Rate the solution if got help

Dec 06, 2010 | Acer Aspire M5100 AM5100-U5313A AMD...

2 Answers

I upgraded my RAM to 1 Gig but it's still showing only 256 meg. Why?


Hi this model sopport 2Gig Memory Ram.


RAM Technology DDR SDRAM Installed RAM 512 MB Max Supported RAM 2 GB Number of Memory Slots 2 x DIMMs Supported RAM Speeds 400 MHz • 333 MHz Installed Cache Memory 256 KB
RAM Technology DDR SDRAM Installed RAM 512 MB Max Supported RAM 2 GB Number of Memory Slots 2 x DIMMs Supported RAM Speeds 400 MHz • 333 MHz Installed Cache Memory 256 KB
RAM Technology DDR SDRAM Installed RAM 512 MB Max Supported RAM 2 GB Number of Memory Slots 2 x DIMMs Supported RAM Speeds 400 MHz • 333 MHz Installed Cache Memory 256 KB
RAM Technology DDR SDRAM
Installed RAM 512 MB
Max Supported RAM 2 GB
Number of Memory Slots 2 x DIMMs
Supported RAM Speeds 400 MHz • 333 MHz
Installed Cache Memory 256 KB

Please check in to your Bios system maybe share memory Video or capacity is setting

Nov 03, 2010 | Dell Dimension B110 PC Desktop

1 Answer

I have Acer Aspire-5570-4765 laptop with Intel Core Duo Processor T2050 (1.60GHz, 533 MHz FSB, 2MB L2Cache) & 1 GB DDR2 (support dual channel) RAM memory. I want to upgrade RAM my memory from 1GB...


512 MB of DDR2 533 MHz system memory, upgradeable to 2 GB using two soDIMM modules (dual-channel support)

Yes its possible
Yes but the memory its going to run at slow speed 533Mhz

Sep 26, 2010 | Computers & Internet

1 Answer

I have motherbroad with 533 mhz can it work on 667 mhz if yes how


No, the speed limit on the motherboard cannot be increased and if you are referring to the CPU's FSB then most likely the new processor will not  even be recognized. If you are referring to the memory speed then it will be decreased to the maximum the mb is capable but it will work.

May 01, 2010 | Computers & Internet

1 Answer

I installed 2 Kingston ddr2 1 Gb 667/533 Mhz each memory chips but a system check shows that only 960 Mb of usable memory is installed. The bios DRAM chipset clock is set at auto. How can I get the system...


have you tested the memory sticks by booting with just one of them ?If yes and they are operational the go into the BIOS and set the memory timings to the slower ones of the both: speed - 533/133 MHz, all latencies at 4.

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2 Answers

OptiPlex GX270 mini tower


Remove the 256mb memory and insert the 512mb memory in slot1 and see whether it works. Please note that the memory needs to be in pairs.

I think the GX260 is mini tower has two different moles
1) PC3200 compatible with memory - 184 Pin DDR3200 400MHz

2) PC2700 compatible with memory -184 Pin DDR2700 333MHz

Please enter the service tag on dell.com and find the manual and the right memory for your PC

All the best!

Dec 17, 2008 | Dell OptiPlex GX270 Small Mini-Tower...

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