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One of the ram isnt recognised???

I have a problem with my ram. My computer originally came with 512mb ofram (DDR2 SDRAM). After having it for two years, i replaced that 512ram with a 1Gig. Not long after that, i bought another 1 gig stickbecause my PC can support 2 gigs of ram. The problem is, my Pc wouldntrecognised both of the ram, it should be showing 2 Gigs of Ram butinstead, it showed only 1gig. 've tried taking out one ram and out eachof them in different slot, my computer can recognised them but when iput them both together, my computer would not recognised, i've tried toput my 1 gig ram with my old 512 ram and my computer would recognisedthem instantly, but when i put both of my 1 gig ram sticks together, itonly shows 1 gig,.I've went into the set up and it shows one slot isempty but i had both of them properly installed. Can sumone help me outhere, i'll appreciate it...both of my 1 gig ram sticks are at samespeed, DDR2 800. One is kingston and the other is apacer.

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This is likely a memory timing incompatibility. You can go into the BIOS settings of many motherboards and set the timing specifically for each RAM slot, but without knowing exactly which piece of RAM you have I can't tell you what to set it at. You could use the utility CPU Z, install one stick, run the utility and write down all the memory information, then install the other stick and write it down too. Then go into your BIOS and see if you can set all of your specifications to match the memory.

Of course if you could find someone to swap sticks with that would be easier. Some motherboards are more picky than others about which sticks they work well with, name brand manufacturers are more picky than aftermarket in general.

Posted on Dec 30, 2008

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I wanted to get my acer aspire T180-UA381B upgraded, and I know very little about computers, how much and what kind of ram should i put in to make it run fast


Based on your memory specs below the maximum RAM that you can install in your computer is 1GB
DDR2 SDRAM and you can get 1GB RAM for like $15 -$ 20. 1 GB DDR2 SDRAM is what you need to buy.

Your Memory Specs:
Installed Cache Memory: 256.0 KB
[close] Installed RAM: 512.0 MB RAM, or Random Access Memory, is the place in a computerwhere the operating system, application programs and data in current use arekept so that they can be quickly reached by the computer's processor. Theamount of RAM you have affects how quickly you will experience your computerworking.
[close] Installed Video Memory: 512.0 MB
[close] Max Supported RAM: 1.0 GB
[close] Number of Memory Slots: 4 x 240 Pin DIMMs
[close] RAM Technology: DDR2 SDRAM

Feb 11, 2011 | Acer ASPIRE T180-UA381B DESKTOP PC

1 Answer

Can i use DDR2 RAM instead of DDR1


YES, if your motherboard accepts DDR Sdram, and DDR2 Sdram ram memory. If your motherboard has both types of ram memory slots.

BUT, you can ONLY use DDR Sdram, OR, DDR2 Sdram.

You Cannot use both types of ram memory in the motherboard, at the same time.
(BIOS will only recognize one type at a time)


NO, if your motherboard does not have ram slots for both DDR Sdram, and DDR2 Sdram ram memory.

Double Data Rate Sdram ram memory modules, have 184 gold plated contact pins on the bottom.
92 on Each side,

http://en.wikipedia.org/wiki/File:Generic_DDR_Memory_%28Xytram%29.jpg

(You can click on the above photo to enlarge)

DDR2 Sdram ram memory modules have 240 contact pins.
120 on Each side.

Sep 04, 2010 | HP Computers & Internet

2 Answers

I would like to add ram, do you know how many slots and how much memory I can add to this computer? Thanks, Cyn


Your machine supports, DDR2 SDRAM or (DDR2) type Ram, maximum 2GB and has two Ram Slots.

Good luck.

Thanks for using FixYa.

Aug 19, 2010 | E-Machines W3107 (RBW3107) PC Desktop

1 Answer

Motherboard for compaq pcsr5109uk have upgraded to 1,5 GB this adding a 1 GB ram since doing this pc will not boot up,pc has said that the mother board has died this has only started since new ram have...


From what you have stated, the original ram memory was two sticks of 512MB.
It's PC2-5300
(DDR2 Sdram at 667MegaHertz)

When installing ram memory, and installing two sticks with one stick being larger, the larger stick of ram memory is installed in Slot 1.

This is the ram memory slot that is closest to the Processor.
(The Processor reads Slot 1 first)
On the motherboard it has DIMM 1 printed next to Slot 1.

The 1GB stick should go into Slot 1 (DIMM 1), and the 512MB stick should go into Slot 2 (DIMM 2)

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01077654&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=3457899

Scroll down for the motherboard illustration, and photo.

Won't boot up with the original ram memory installed again?
1) What type, and size of 1GB ram memory did you install?

2) What ram memory slot did you install it in?

3) Did you follow anti-static precautions BEFORE you put your hands inside your computer, and BEFORE you took that ram memory stick out of it's protective anti-static bag?

[Your body carries Static electricity.
Static will fry out (Short Circuit) the hardware components inside a computer.

You may not even see it, or feel it.
Poof!
No computer.

Computer unplugged from power, computer on a table, computer case open, TOUCH the metal frame to relieve your body of Static.

{A couch, bed, or directly on a carpet floor are HIGH areas of Static]

Before you answer my questions try this;

If the two sticks of 512MB PC2-5300 are still installed, follow anti-static precautions, and remove them.

Take a pencil eraser, and clean the gold plated contact pins on the bottom of each ram module. (Stick)

http://en.wikipedia.org/wiki/File:Generic_DDR_Memory_%28Xytram%29.jpg

(The above example is DDR Sdram, not DDR2 Sdram. I posted the link so that the gold plated contacts are clearly shown.

DDR Sdram has 184 contact pins.
92 on each side.
DDR2 Sdram has 240 contact pins.
120 on each side)

Remove the eraser dust with air. Use a can of compressed air for computers, or air pressure from your mouth.

Reinstall the ram memory modules.

Computer unplugged from power, press the Power On button in.
Hold the button in for a count of Five seconds.
(Count 1001, 1002, 1003, 1004, 1005)

Let go of the Power On button.
Do this procedure two more times.

What you are doing is clearing CMOS Error Codes, and resetting BIOS back to the factory settings.

Plug the computer back into power.
WAIT 1 minute, then turn the computer on.

I await your findings, and answers to my questions.

Jun 04, 2010 | Computers & Internet

5 Answers

Tried to upgrade ram with 2 new pc133 sticks of 256mb ea. Didn't work. What's wrong? Are there switches on the motherboard I need to change? Or something else?


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'.

Jul 12, 2009 | E-Machines eMachines Desktop PC

1 Answer

Upgrade Ram - what do I buy?


This is what the spec says. - DDR2 667 MHz SDRAM, 2 x SODIMM socket for expansion up to 2GB SDRAM

If your computer currently have 1GB of RAM. Its high possible there is 2 sticks of 512mb in there right now. so you will need to get 2 1GB memory since you will need to take out both of those sticks to put in these 2. There is only 2 slots.

May 09, 2009 | Computers & Internet

2 Answers

Ram upgrade


you need to make sure the ram is compatable, it looks like an old machine so chances are its using sdram pc100,
check the ram your trying to make sure its not pc133. let me know what each piece of ram has on its sticker

Mar 23, 2009 | Dell OptiPlex GX200 PC Desktop

4 Answers

E-machine not accepting new memory


try to check  whether the ram  frquency  matches the specifications....
any way  three beep  means a graphics card problem  so  if you have one remove it and try to reboot
but i think this has to do with the RAM frequency
pls do post back

Nov 26, 2008 | E-Machines eMachines W2686 PC Desktop

1 Answer

Ram issue with compaq presario 5000 G1 Series


as you can see from the information below there are different requirements for RAM to work stable in your system . Most importand are the RAM VOLTAGE , SPEED , and Configuration of chips. you will need to consult the manual for qualified RAM requirements. Some RAM will work but not very stable. make sure the voltage supplied by your system is enough for the RAM. If you are running DDR RAM in dual channel mode, the ram needs to be the same size also. DIMM modules for the HP computer must meet the following requirements
  • The number of pins on the DIMM must match the socket type.
  • DDR memory requires a 184-pin slot and 1.8 operating voltage.
  • DDR2 memory is not compatible with DDR1 memory and requires a 240-pin slot and 2.5 operating voltage.
  • Synchronous dynamic random access memory (SDRAM): Only use DDR type SDRAM memory if the computer came with DDR-SDRAM.
  • SO-DIMM modules for the HP computer must meet the following requirements
    • The number of pins on the DIMM must match the socket type.
    • SO-DIMM memory requires a 200-pin slot.
    • DDR2 SO-DIMMs are not compatible with DDR1 DIMM and DDR2 DIMM memory modules.
    • With a computer running at a system bus of 533 MHz or 667 MHz, use a PC2-4200 (DDR2 DIMM 533) type.
    • The following requirements must be met for the DDR memory to function in dual channel mode:
      • Same density (256MB, 512MB, etc.)
      • Same DRAM chip technology (x8 or x16)
      • All either single-sided or dual-sided
      • Matched in both Channel A and Channel B memory channels

Oct 22, 2008 | Compaq Presario 5000 PC Desktop

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