2x 1GB Memory doesn´t work

Maybe 1GB is the maximum amount of memory that your system will hold. And maybe your system likes memory to be in pairs, so when you put the 1GB in by itself it didn't work, but when you put it in with a 512MB it works.

Hello. this website will show you the supported RAM for your Motherboard.
RAM Support
Hope this helps!

Hi,

According to the Dell specification found here:
http://support.euro.dell.com/support/edocs/systems/dim2400/en/sm_en/specs.htm#1105481

your PC does not support registered ECC RAM.

Most desktop PCs use unbuffered RAM. Registered ECC (Error Checking and Correcting) is a special type of RAM mostly used in servers.

Unbuffered RAM is faster than ECC RAM and is usually cheaper.

To find RAM that is compatible with your PC try the memory configuration tool at www.crucial.com

Please rate my answer is this was helpful.

Many thanks,

Chris

This is the memory spec for your motherboard...

3 x DDR DIMM Sockets
Max. 3 GB unbuffered PC2100 / PC1600 non-ECC SDRAM Memory (PC3200 Max. to 2 banks only / PC2700 Max to 4 banks only)

Part of the memory spec will tell you if it is single sided (memory chips only on one side of board)
Double sided is memory chips on both sides of the board....Some systems will not work with double sided memory...

Yes.

Maximum Total Amount is 2GB.
Maximum Amount for EACH Ram Memory slot is 1GB.

Use unbuffered, low density, Non-ECC.
2.5 volt to 2.6 volt
Chip configuration is 128Meg X 64 for a 1GB ram memory module.
(Ram memory 'stick')

Suggest you watch where you buy it.
Cheap costing ram memory = cheap quality ram memory
Doesn't have to 'break the bank' in cost, but if it's too cheap to be true, it usually is.
Buy from a reputable ram dealer.

Manufacturer Specifications - EPoX EP-4BDA533I Number of Slots:
Slot 1
Slot 2
Each memory slot can hold DDR PC2700,DDR PC3200 with a maximum of 1GB per slot.*
*Not to exceed manufacturer supported memory.

• 184-pin DIMM Banking: 2 (2 banks of 1)
• Chipset: Intel 845D
• Error Detection Support: ECC and non-ECC
• Graphics Support: AGP 4X
• Max Component Density: 512Mb
• Max Unbuffered DDR SDRAM: 2048MB
• Module Types Supported: Unbuffered only
• Supported DRAM Types: DDR SDRAM only
• USB Support: 1.x Compliant

Q: What memory goes into my computer, and will a faster speed be backward-compatible?
A: DDR memory with support for DDR PC2700,DDR PC3200 speeds.
Because DDR memory is backward-compatible, you can safely upgrade your system with any of the guaranteed-compatible DDR speeds listed below, even if your manual calls for PC1600 or PC2100 speeds.
Q: How much memory can my computer handle?
A: 2048MB.
Adding the maximum amount of memory will improve performance and help extend the useful life of your system as you run increasingly demanding software applications in the future.
Q: Do I have to install matching pairs?
A: No.
No, you can install modules one at a time, and you can mix different densities of modules in your computer. But if your computer supports dual-channel memory configurations, you should install in identical pairs (preferably in kits) for optimal performance.
Q: Does my computer support dual-channel memory?
A: No.
Your system does not support dual channel.
Q: Does my computer support ECC memory?
A: Yes.
Your system supports ECC. You can put non-ECC modules into an ECC system, but be sure not to mix ECC and non-ECC modules within a system. Install the same type of modules that are already in your system.

If your motherboard supports ECC, and you can afford the much-higher cost of ECC RAM, then buying/using ECC is "best".

Note that "buffered" memory is much slower than "unbuffered" memory.

Your motherboard takes 533 or 400 DDR2 SDRAM Non-ECC DIMMs.
If your memory is DDR2 Non-ECC it will fit but only work at 533.

Each memory slot can hold DDR PC2700,DDR PC3200 with a maximum of 1GB per slot.

Chipset: SiS 648

Supported DRAM Types: DDR SDRAM only

184-pin DIMM Banking: 3 (3 banks of 1)

Module Types Supported: Unbuffered only

Max Unbuffered DDR SDRAM: 3072MB

Error Detection Support: Non-ECC only

Graphics Support: AGP 8X

Max Component Density: 512Mb

USB Support: 2.x Compliant

Hi Patrick,
I see you're point. I know this, you can not run "more than" 512MB in any DIMM slot. That is shown at the bottom of page 10 & the top of page 11. You can not run both types of memory at the same time, even though the chart looks like you could. The description term on page 10, states; Users only can install either 168-pin SDRAM Module or 184-pin DDR DRAM Module at one time. (You can't run both). You can run 4x512MB in all banks using184-pin DDR SDRAM. Or you can run 4x512MB in all banks of 168-pin SDRAMs. Total of 2GB.
So you can not run 1GB of memory in any bank.

Mike