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Is It Bad To Use PC100 Memory On A PC133 Memory Slot ?

All rights reserved. Most motherboards support either SDRAM or DDR, but not both. These refresh cycles occur between uses of the memory and are delayed a small amount when a CPU or DMA (Direct-Memory-Access) operation is in progress. You will also find additional definitions in our Memory Glossary. his comment is here

Typically, the 133 MHz SDRAM chip has a speed rating of 7.5 nanoseconds (7.5 billionths of a second) when running on a motherboard with a 133 MHz Front Side Bus. Yes, my password is: Forgot your password? The Bottom Line, what makes a good PC133 Module? The cost difference is so narrow that it can't be automatically assumed that the slower memory is cheaper!How much faster is one memory over another? http://www.tomshardware.com/forum/162032-31-pc133-pc100-together

Among his more than 180 books are Upgrading & Fixing Laptops For Dummies and Laptops For Dummies Quick Reference.Bibliographic informationTitleFix Your Own PCFIX YOUR OWN PCAuthorCorey SandlerEditionillustratedPublisherJohn Wiley & Sons, 2007ISBN0470107871, Join over 733,556 other people just like you! Not much, really.

Discussion in 'General Hardware' started by GizmoFreak, Nov 4, 2004. Useful Searches Recent Posts Menu Forums Forums Quick Links Search Forums Recent Posts Menu Log in Sign up AnandTech Forums: Technology, Hardware, Software, and Deals Home Forums > Hardware and Technology What are you smoking besides incompatible RAM? :roll: VirtualLarry -- Thanks for a good explanation of the reasons for the incompatiblity I noted. #17 Harvey, Nov 5, 2004 techwanabe Diamond Another problem I ran into is that some older motherboards are not set up to use more than 512Mb or 768Mb of RAM.

Lastly, each chip manufacturer designs their chips to require a minimum loading on the address lines and supply only so much current on the data output lines. In theory, PC2100 DDR memory is twice as fast as PC133 SDRAM memory, but in practice the SDRAM motherboards make double-use of the 133MHz FSB speed so the actual overall system Here are two examples, a PC100 module from Micron and a PC100 chip from Samsung. find this There is a ROM on each DIMM that identifies it's properties to the system and this causes a problem when plugging in two PC133 DIMMs that are only partially refreshed.

If you have Adobe Acrobat installed, click this link to review Intel's PC133 Validation Specifications for PC 133 Modules. SDRAM and DDR use different types of memory slots for installation. About CNET Privacy Policy Ad Choice Terms of Use Mobile User Agreement Help Center Log in or Sign up Tech Support Guy Home Forums > Software & Hardware > Hardware > If your system only sees ½ or ¼ of aDIMM, then a refresh incompatibility is the root problem.

Search all issuesPreview this magazine » Browse all issues19902000 Jan 2000Feb 2000Mar 2000Apr 2000May 2000Jun 2000Jul 2000Aug 2000Sep 2000Autumn 2000Oct 2000Nov 2000Dec 2000Jan 2001Feb 2001Mar 2001Apr 2001May 2001Jun 2001Jul 2001Aug 2001Sep What has been interpreted, as a difference between low-density and high-density chips is really the problem of required refresh cycles and not the density of the cells themselves. As long as your memory modules, and the chips on them, are manufactured by a major supplier, such as Micron/Crucial, Kingston, Samsung, IBM, Hyundai, NEC, Toshiba, Hitachi, you can usually rest Some PC-100 DIMMs have chips with a 10ns speed, which you definitely wouldn't want to use on a 133 MHz bus.

Disturbed by these reports, I spoke with the hardware design engineers at several of these companies and confirmed that the refresh compatibility information requirement is still valid. Please start a New Thread if you're having a similar issue.View our Welcome Guide to learn how to use this site. Looks like you've been smok'in - er, can you say short term memory loss? While most systems will accept memory modules having either a CL=2 or CL=3 chip, there are some systems that require one or the other.

All Rights Reserved. I am now happily running with 512 MB and I will not try to add any more memory to this system. As an example, if you were to install a PC133 module in a system with a 100MHz FSB, or in a system already containing a 100MHz module, the PC133 module will weblink It's a safe generalization to say you should get the fastest memory your computer supports.

Proffitt Forum moderator / August 29, 2005 1:31 AM PDT In reply to: Memory, difference between PC100 and PC133 http://www.crucial.com has a memory primer for you to review. While there are many cases where PC100 modules, and even the older PC66 SDRAM modules, have worked together on the same motherboard at 133MHz bus speeds, however those situations are extremely Buffered and registered modules are typically used only in mission-critical systems, such as servers.What do the memory specifications such as 16x64 or 16x72 mean?

PC133 SDRAM is available only in the form of a 168-pin DIMM (as it pertains to personal computers).

Otherwise it is a non-parity memory module.So what do I need to know about non-parity memory modules, parity memory modules and ECC memory modules? Image 8GB 2X 4GB RAM MEMORY FOR INTEL CERTIFIED PC2-5300 DDR2 667 MHZ FBDIMM NEW!!! $12.85 Buy It Now 4GB DDR3 1600MHz PC3-12800 240 pin DESKTOP Memory Non ECC 1600 Low Can I install this on the ThinkPad and expect no adverse effects? #1 GizmoFreak, Nov 4, 2004 Loading... Most of the PC100 SDRAM DIMMs use 2k or 4k refresh cycles on a different timing schedule.

The CPU and motherboard chip set waits a fixed amount of time to read the data lines from the DIMM and, because of the buffer delay, the CPU may grab the If you know the number of refresh cycles required by the DIMM and the number of refresh cycles provided by your motherboard, you can avoid this major roadblock to memory selection. That's good because this type of memory is faster and less expensive. I understand Video Graphic Memory, and Memory to open Applications.

You can not post a blank message. There are compatiblity issues with newer PC133 memory and older PC100 RAM slots. As you may have noted above, the PC133 SDRAM module was designed to improve the memory bandwidth of the personal computer from 100Mhz to 133Mhz. Some day I may try to change the code just for fun but, I don't have the time or the physical space to start another project right now. *-------------------------------------------------------------------------------------ADDENDUM #4: (28

When manufactured, PC133 SDRAM, must meet Intel's requirements (the PC133 Standard) for use with motherboards having a 133MHz FSB (front side bus). The PC133 Intel/JEDEC Standard still includes the following: Minimum and maximum trace lengths for all signals on the module Precise specifications for trace width and spacing Detailed specifications for the distances Feb 21, 2007 7:45 PM Helpful (0) Reply options Link to this post Apple Footer This site contains user submitted content, comments and opinions and is for informational purposes only.