DDR slots gone crazy-switched to SDR-OK

did you buy them as a working pair or individually
they are not compatible
hope this helps

DDR266 originally.

Most motherboards no longer have any jumpers for memory, it's auto-detected. Most likely your motherboard doesn't support the size modules you've installed, or you've used an incompatible type. You should check the board manual (usually available from the manufacturer's website) for memory specifications, and be sure yours will work.

you have to add memory with the same frequence.DDR 2700 or 3200
Not mixed togheter..

1st try to exchange the cards in the slot.
2nd try another card
3rd ur RAM slot may not be ok
4th ur RAMs may not be compatible
5th ur new RAM card may not be ok
use same type of RAMs, and same size...
if u have 256, add 256
if u ahve 128 add 128
if u have SDR then dont add DDR
getting compatibility is little difficult...
some times no combinations can work...
note...technology keeps changing...so a old RAM card that was bought years ago may not be compatible with a new RAM card....
even i got all my old RAM cards(256+128) removed and got 2 - 512mb of the same type fixed...even i had issues with my RAMs for 6 months...

A really unique MB since Each DIMM slot can accommodate DIMMs up to 512 MB in size, although both DDR and SD-RAM are supported, but any one at time, i.e. one among consisting of a bank of 2 DIMM slots(blue pair & black pair having the pairs 2 slots each) for DDR or 2 DIMM slots for DDR or SDR memory cannot be used at the same time. Thus the board supports either 1 GB of PC133 SDRAM, or 1 GB of DDR sdRAM, but not both at the same time.

I hope you got the Catch 22 here !! Nice low costs for doing simple work?
but it's a Catch 22 situation{either choose the Devil or Hell !) ................. sodeep

No there are no DIP switches to change, or jumpers to move on your motherboard, in regards to your BIOS recognizing ram memory installed.
(BIOS. Basic Input/Output System. This tiny program, {64MB in size usually}, that is burned into your BIOS chipset, is what recognizes ram memory on your computer)

Things to know about the older Sdram ram memory.
1.It's really SDR Sdram. Single Data Rate Synchronous Dynamic Random Access Memory.
DDR is Double Data Rate Sdram, DDR2 is Double Data Rate 2 Sdram, and so on.

Point? All ram from SDR to DDR3, IS Sdram.

2.Standards have been set by JEDEC for computer ram memory starting from DDR Sdram on up. This standards were not implemented back in the day of SDR Sdram.

Point? Ram memory manufacturers didn't all follow the same standard, and ram memory made for one computer, would Not work in another computer.
This means you need THE ram memory for YOUR eMachines computer.

Main factors when buying SDR Sdram,
A.Correct type. You know this. SDR Sdram.
168 gold plated contact pins on the bottom of the ram 'stick'. (82 on each side)

B.Correct 'Speed'. ('Speed' is slang for Frequency Rate) You know this. SDR Sdram that operates at a frequency rate of 133MHz. (Or also known as PC133)

C.It must be low density Non-ECC ram memory. It cannot be high density ECC. (Error Control Correcting. Used for Server computers mostly)

D.Correct CAS Latency. Also known as Ram Timings. 3-3-3-3-2 would be normal for SDR Sdram.

E.Correct Chip Configuration. How the DRAM chips are accessed. DRAM chips are the black rectangular chips on each side of your ram memory 'stick'. Also what size the DRAM chips are in MegaBytes. (MB)

F.What the Maximum TOTAL Amount is for the motherboard. Is it 256MB? 512MB? Or more?

G.What the Maximum Amount is for EACH ram 'slot'. (Correct speak for 'Slot' is Bank)

H.Do you have four ram 'slots'? You MUST have a ram stick in Slot 1. This is the slot closest to the processor. It is the first ram slot the processor 'reads'.

Hi safran0785,
The Asus motherboard, P4S533-MX can run two different types of memory.
(Just not at the same time & in different slots).
You can use 2, 184-pin memory, PC2700/PC2100 MHz or PC1600 up to 2GB. (1GB DIMMs) inserted in the two memory slots closest to the CPU.
Or you can run SDR memory, 168-pin PC133 or PC100MHz DIMMs up to 1GB of memory in the last two slots farthest from the CPU.
You can not run both types of memory at the same time.
The 184-pin DDR PC2700MHz memory is much faster then SDR memory.
The maximum amount of system memory supported is 2GB.

Need more information/questions, just post here.
Good luck safran0785!
Mike

No SDRAM is single data ram, with 2 slots in the bottom and DDR is double data ram, with one slot at the bottom.

The normal DDR Ram is supported..It doesn't support DDR2..