i am attempting to upgrade my memory and i need to know if (non-ecc) and (reg-ecc) can cause problems if you put the wrong one in your computer? my model is presario s4020wm
202965
Appears to be DDR Ram PC2100 nonECC\n\nhttp://dealnews.com/memory/prices/systems/Compaq-Presario-s4020-wm-PC2100-DDR-266-MHz/32284/128MB.html
469197
Check to make sure you dont have any recalls on that particular thing. Maybe you didn't put it in correctly. ummm maybe your laptop is not responding correctly to it because the unknown error is not effecting it. Just follow the error and keep doing what ya doing. have a nice day
366771
www.crucial.com\nsome of the memory may be diverted over for video memory.  There may be a setting in the BIOS.
286759
If you have an empty slot them you can add another stick of RAM.  Make sure it's the same kind.  You can easily trade out your old CDROM for a CDROM/RW.  Just pull the old one out and replace it with the new one.  You can pick up PC parts really cheap from eBay.
670827
I think you answered your question without even realizing it.  You can install pc2700 ddr memory.  It is also known as DDR333.  The link is to Newegg, 512mb starts at $45 shipped.  Much cheaper than  Best Buy, Circuit City etc...\n\nSome people will tell you to only buy the expensive brands, but I have never noticed a problem with the lesser known brands.  Look for lots of reviews, it is usually a good indication of a well liked product.\n\nI would suggest checking to see if you computer will support 1gb (probably) and purchase that.  512mb is fine for WinXP but 1gb makes it hum right along.\n\nHope this helps.\n\nJust a note, you cannot use DDR2.  It is not physically the same, the slots the memory installs in are different configurations.
364387
If you are not sure about which RAM you need, or you do not know your motherboard model, then you can do a system test at  - \nwww.crucial.com\n\nIts called system scanner, the link is here - http://www.crucial.com/uk/systemscanner/\n\nThis will identify your system and give you all the compatible/available options to ugrade..\nIts a nice tool, obviusly you dont need to buy it from there..... you just need to find out what you need..........
649310
No, DDRam and SDRam are two different and uncompatible types of Ram.  If your new motherboard takes DDR and you only have SDR, you will have to go out and purchase DDR.  Sorry.
512557
Need a little more info.\n\nhttp://www.upgradememory.com/index.cfm\nhttp://stores.ebay.com/TechGiants
233735
The RAM modules' speed must at least match the memory controller on the motherboard. You can always use faster RAM modules than required, but not slower.
651018
I've been doing that since the IBM PC was introduced in 1981.  I kept upgrading the same computer a little at a time, and it went through a number of cycles where all of the parts had been replaced, so it was a whole new computer each cycle, but each cycle was a number of years.\n\nBut I've gradually come to the conclusion that's a mistake.  The parts keep evolving.  Subtle differences from one year to another cause subtle compatibility problems.  As just one of hundreds of examples of this problem, I added an ATI video card a number of years after I upgraded to a new motherboard, and it stopped working about once per month on average.  It just froze/crashed the whole computer, such that it needed a power-on clear.  It turned out the motherboard had a subtle glitch at the speed of that video card, and I had to reduce the AGP speed.  That solved it, but that kind of problem takes months or years to diagnose, because the symptoms only happen at random.  If the motherboard and video had been from the same year as each other, they would have been far more likely to be compatible with each other.  Glitches such as that one don't get much testing in their early years before the right combination of products is available to make them happen.  And by the time those products are available, the earlier products are being phased out, so the glitch doesn't get much testing then either.\n\nTherefore, instead of gradually evolving a computer, I recommend that you save your money till you can afford to start from scratch, and build a whole new computer then.
454715
No there's not a way around it I'm afraid, you'll have to buy more memory. The good news is it'll be cheap for you, probably less than your monthly broadband subscription as you probably have an older system. If you post your RAM specs on here or email me I can tell you what you need and how to install it into your system
319282
http://www.memtest86.com/\ndownload and run the test. if it fails then it is your RAM. \n\neither that or your power supply is going to imminently die.
318722
Actually your doubt was right. the problem may be due to incorrect clock speed. solution is first of all assure that both of the rams do work properly when inserted single at a time. i.e. it doesn't give any error. then if there is a option to set your ram's clock speed manually in the BIOS of your PC then  set it normally the clock speed of the SD ram in p3 machines will be 133MHz. so set it to that speed. or even 100MHz and then see the difference if still the problem persists then please personally mail me. so that i can get you the detailed solution over the mail.
127414
I don't believe they will work together at all. You most likely purchased the wrong memory type. Try calling up your computer manufacturer and ask what type of memory you need to get. I know my computer uses DDR2 PC2-4200 SDRAM, but there are dozens or even hundreds of diffent types.
503924
as long as it's DDR you'll be fine ... even if it's faster DDR like for example PC400 it will still "clock back" to the 266 that your board uses ....
439536
Great question. Your memory is being managed by your Microsoft Windows XP or whatever you're currently using. By allowing other programs to take part in that memory, you'll be causing a bad conflict that will eventually cause the machine to start reporting false and inaccurate CRC information and free disk space. Windows offers you "Task Manager" which is, of course, the very best that's offered. Microsoft products for Microsoft Applications. Larry Radio Shack 01-9590
176505
Unbuffered is what you need to use.\n\nhttp://partsurfer.hp.com/cgi-bin/spi/main?sel_flg=partlist&model=DK214A&HP_model=&modname=Presario+S4020WM&template=main&plist_sval=Memory&plist_styp=subcat&dealer_id=&callingsite=&strsrch=&keysel=Memory&catsel=%3F