Can we install 2 1GB memory modules in one bank and 2 512 in the other on a gatway e-4300 for 3GB or memory

Memory Upgrade for Gateway GT5082 Computer, the Gateway GT5082

Computer takes the PC3200 DDR SDRAM DIMMs. Supports Dual Channel DDR. Memory

Type, and comes installed with 2.0 GB = 512 MB (removable) + 512 MB (removable) + 512 MB (removable) + 512 MB (removable) of Memory. You can upgrade your

Gateway GT5082 Computer to up to a maximum of 4.0 GB Memory, the system has 4 sockets to install Memory, already with 2.0 GB = 512 MB (removable) + 512 MB (removable) + 512 MB (removable) + 512 MB (removable) standard Memory installed.

For best Computer performance use the maximum amount of allowed Memory per slot for your Computer.
Choose the following Memory Upgrade for Gateway GT5082 Computer.

If you're not sure if a module is right for your system, use the Crucial Memory Advisor tool for a list of guaranteed compatible modules.

hope it helps

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.

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This motherboard can support up to 2Gb of DDR266 RAM modules.

Attached is part of the memory detail from the manual.

If you need a copy of the manual. please click on this link to download :-

ftp://serwery.optimus.pl/Servers/Motherboards/SE7501BR2/Dokumenty/se7501br2tps.pdf

3.1.2.2 Memory Configuration

Memory interface between the MCH and DIMMs is 144 bits wide. This requires that two DIMMs

be populated per bank in order for the system to operate. At least one bank has to be populated

in order for the system to boot. If additional banks have less than two DIMMs, the memory for

that bank(s) will not be available to the system.

There are two banks of DIMMs, labeled Bank1 and Bank2. Bank1 contains DIMM locations

DIMM1A and DIMM1B and Bank2 contains DIMM2A and DIMM2B. DIMM socket identifiers are

marked with silk screen next to each DIMM socket on the baseboard. The sockets associated

with any given bank are located next to each other.

The baseboard's signal integrity is optimized when memory banks are populated in order.

Therefore, DIMM Bank1 must be populated before Bank2.

DIMM and memory configurations must adhere to the following:

• DDR266 DDR registered DIMM modules

• DIMM organization: x72 ECC

• Pin count: 184

• DIMM capacity: 128 MB, 256 MB, 512 MB, 1 GB, 2 GB

• Serial PD: JEDEC Rev 2.0

• Voltage options: 2.5 V (VDD/VDDQ)

• Interface: SSTL2

• Two DIMMs must be populated in a bank for a 144-bit wide memory data path

• One or two memory banks may be populated

Table 2. Memory Bank Labels

Memory DIMM Bank Row

J8D22 (DIMM 1A), J8D15 (DIMM 1B) 1 0, 1

J8D7 (DIMM 2A), J8D1 (DIMM 2B) 2 2, 3

Note: Memory must be installed in pairs; DIMM Bank1 must be populated before DIMM Bank2.

Memory within a DIMM bank must be identical; between banks only the DIMM size may be

different.

Functional Architecture Intel® Server Board SE7501BR2 Technical Product Specification

26 Revision 1.2

Intel Order Number C13977-003

Figure 3. Memory Bank Label Definition

Simple test - leave only the 512 stick and go into the BIOS and see if the memory is correctly recognized. If it isn't then it's defective. If it is then download, burn and boot from
http://www.pclinuxos.com/
and run the memtest to be sure. If the memory is ok then you will have to reinstall Windows - it doesn't like the new memory.

Swap the modules between the slots.

If the message shanges to slot 0 not recogonized, then you have a bad memory module,
Easy fix, just get another module.

If the message does not change, then you have a problem on the mother board.
Not an easy fix, it would be cheaper to buy a 1GB module and use the good slot.

Good Luck!

Hello

Thank you for using FixYa for your problem


Sorry but on there website max is 512MB of ram

Please rate our solutions and if you still have problems please call back for more ideas to help you

Thanks
Richard Scott
Technical Support
New Zealand

I am sure when you say 256k you mean 256 mb? You should not have to do anything for the computer to recognize it. Almost all computers are set up to automatically recognize memory. When installed and you right click on my computer and select properties how much ram does it say is installed? If it is just shy of 1GB or if says something like 985MB then that would be normal. If it only says 512 or 469MB then you have a problem with the second memory bank.

eMachines T3642 Computer takes the PC2-5300 DDR2 SDRAM DIMMs. Supports Dual Channel DDR2. Memory Type, and comes installed with 1.0 GB = 512 MB (removable) + 512 MB (removable) of Memory. You can upgrade your eMachines eMachines T3642 Computer to up to a maximum of 2.0 GB Memory, the system has 2 sockets to install Memory, already with 1.0 GB = 512 MB (removable) + 512 MB (removable) standard Memory installed. For best Computer performance use the maximum amount of allowed Memory per slot for your Computer.


INSTALLATION PROCEDURE
1. Place the computer power switch in the "off " position and disconnect the AC power cord.
2. Remove the computer top cover following the instructions in the model-specific owner manual.
3. Before touching any electronic components, make sure you first touch an unpainted, grounded metal object to discharge any static electricity stored on your clothing or body.
4. Locate the memory expansion sockets on the computer motherboard. If all the sockets are full, remove smaller capacity modules to allow room for higher capacity modules.
5. The ejector tabs shown in the illustration are used to remove a module. By pushing outward on the ejector tabs, the module will pop-up from the socket and it can then be removed.
6. Handle your new module carefully; do not flex or bend the module. Always grasp the module by its edges.
7. For most installations, DDR modules can be installed in any available expansion slot. Other installations may require the memory to be installed in a particular sequence based on the modules capacity. Check your owner manual to determine the correct installation sequence for your configuration.

Insert the module into an available expansion socket. Note how the module is keyed to the socket. This ensures the module can be plugged into the socket one way only. Firmly press the module into position, making certain the module is completely seated in the socket. The ejector tabs at each end of the socket will automatically snap into the locked position. Repeat this procedure for any additional modules you are installing. 8. Once the module or modules have been installed, the computer top cover can be reinstalled.
9. Plug in the AC power cord and reinstall any cables disconnected during the installation process.
10. Turn on the computer and follow the instructions in your computer owner manual that describe the steps necessary to allow your computer to recognize the newly installed memory.

I’m happy to help further over the phone at https://www.6ya.com/expert/william_83fc156eee2b555e

Below are the specs to the type of memory that can be installed in the A75...it is very specific and cannot be anything else then what is listed. You have 512 mb built onto the motherboard, with one expansion slot. That slot can only hold up to 1 gb stick if the BIOS has been upgraded. Go to Toshiba support and make sure the BIOS on the machine is up to date so it will accept the larger stick of ram memory and make sure all the specs are right on the stick that you have.

Each memory slot can hold DDR PC2700 with a maximum of 1GB per slot.*

Maximum Memory: 1536MB

Slots: 1 (1 bank of 1)

Standard Memory: 512, 768, or 1024MB (512MB non-removable)

USB Support: 2.x Compliant

visit vaio manual in
ftp://ftp.vaio-link.com/pub/Manuals/Notebooks/
You can do this in two ways: opening your notebook and taking a look on the memory modules already installed (we will explain more about this later) or running a program like Everest (available on our download section). We ran Everest (going to Motherboard, Chipset, Memory Slots) on our notebook and found that it was using two 256 MB DDR-SDRAM PC2700 (“DDR333”) modules, for a total of 512 MB.

click to enlarge
Figure 1: Checking your current memory configuration with Everest.
If your notebook has an empty memory slot, just go to the computer store and buy a new SO-DIMM module with the same technology (SDRAM or DDR-SDRAM) and speed of any capacity you want – of course you need to know the capacity limit of your notebook. You cannot install a 1 GB module in a notebook that only accepts modules up to 512 MB, for example. Our notebook – a Sony Vaio PCG-V505ECP – accepts modules up to 1 GB, for a total of 2 GB RAM, since it has two memory slots.
For example, if your notebook has one 256 MB module and an empty memory slot, if you buy and install another 256 MB module, it will have 512 MB RAM. If you buy and install a 512 MB module, your notebook will have 768 MB.
If your notebook already has two memory modules, you will need to remove one of the installed modules in order to install the new one. If the two modules have the same capacity, it doesn’t matter which one you will take away, but if they have different capacities, remove the one with smaller capacity. The new RAM capacity of your notebook will be of the capacity of the remaining module plus the capacity of the new module.
In our case, our notebook has two 256 MB modules. So we will remove one of these modules and install a new one on its place. We bought a 1 GB-module, so after installing it our notebook will have 1,280 MB RAM installed (memory math is tricky, since 1 GB equals to 1,024 MB not 1,000; so 1,024 MB + 256 MB = 1,280 MB).


else visit
http://www.hardwaresecrets.com/article/189/1