?
Solved

Crash after installing more Ram

Posted on 1998-04-30
7
Medium Priority
?
243 Views
Last Modified: 2013-11-10
Recently I upgraded my Dell XPS 120 (Pentium) to Pentium/MMX by using Powerleap's adaptor. It works fine with original 32mb (EDO). However, when I pulled out 2*8mb from and added 2*32mb EDO chips into slot 1&2 (80mb total), the system became very unstable. The error message indicated "programs perform illegal operation" appeared frequently. When I pulled out the rest of 2*8mb chips, left only 2*32mb onboard, the system would crash immediately after windows start.
However, when I replaced the 233 MHz with the original 120 CPU, the system worked fine.
Does this crash have something to do with BIOS Ram setting, such as memory wait state adjustment?
As Dell doesn't offer option to change this setting, what's the best way to make this adjustment?

Thank you for your advice.

Weimin
0
Comment
Question by:weimin
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
7 Comments
 
LVL 3

Expert Comment

by:jlove1
ID: 1012059
It's probably a memory timing issue.
I don't know exactly what BIOS  that your DELL has, but You can tell,  whenever the computer boots, it'll say what kind of BIOS it has (AMI,AWARD,PHOENIX, etc.).

You can download the appropraite program from the page


It will let you access ALL the settings (ram timings, etc) in your bios.
0
 
LVL 9

Expert Comment

by:rmarotta
ID: 1012060
weimin,
If the proposed answer does not solve your problem, simply re-open the question so that other experts can provide a solution for you.
What is the complete model number of your Dell?
Ralph

0
 

Author Comment

by:weimin
ID: 1012061
It's a Dell XPS120c, with latest BIOS A06. Since this upgrade, I tried different brands of EDO Ram, putting them into different slots, and making different memory combinations. What surprises me is how sensitive they are to the new Pentium 233/MMx chip. The following is the result:
Pair 1 = 2*8mb original Ram
Pair 2 = 2*8mb generic  Ram
Pair 3 = 2*32mb generic Ram
Pair 4 = 2*32mb OEM     Ram

        Slot 1&2  Slot 3&4  Total Ram  Symptom   NortinIS Bench  
1,      Pair 1    Pair 2    32         normal    56
2,      Pair 1    Pair 3    80         Crash
3,      Pair 1    Pair 4    80         Normal    46
4,      Pair 3              64         Crash
5,      Pair 4              64         Crash
6,      Pair 3   Pair 1     80         Crash
7,      Pair 4   Pair 1     80         Crash

It seems that I have only 2 options: either have less memory or have more memory with lower performance.
Dell tech support said that the 32mb should be put into slot 1&2 to improve performance. But I can't.
If I adjust memory timing, that is, increase the wait state, the performance will also be suffered.
The other thing I'm thinking is the size of L2 cache. This system has only 256K Pipeline cache installed. Is 256K only supposed to handle up to 64mb Ram? If it is, will the extra Ram which is not cached cause system crash?

I'd appreciate all your suggestions and advice.

Weimin  
0
Prepare for your VMware VCP6-DCV exam.

Josh Coen and Jason Langer have prepared the latest edition of VCP study guide. Both authors have been working in the IT field for more than a decade, and both hold VMware certifications. This 163-page guide covers all 10 of the exam blueprint sections.

 
LVL 3

Expert Comment

by:jlove1
ID: 1012062
what was wrong with the suggested answer? You can use the utility on the page I suggested to access the internal workings of your BIOS, thus changing the RAM timings.
0
 

Author Comment

by:weimin
ID: 1012063
I appreciated your suggestion. However, there is no information on your reply that I can download that program.

Weimin
0
 
LVL 9

Expert Comment

by:rmarotta
ID: 1012064
weimin,
In some motherboard designs, the use of RAM in excess of 64Mb causes performance to be degraded.
Is it possible to add more cache memory to your motherboard?
Ralph

0
 
LVL 9

Accepted Solution

by:
rmarotta earned 300 total points
ID: 1012065
weimin,
Your best solution will be to obtain faster RAM.  The CPU is exceeding what your present memory can handle.
Usually, the speed in nanoseconds is printed on the individual RAM chips as a suffix number.(e.g. -50, -60, etc.)
Without a BIOS option to reduce memory timing (increase wait states), I suggest you reduce the bus clock frequency on the motherboard.  If there is more than one setting available, start with lowest and increase until trouble occurs.  Then reduce to the next lower setting.
I think you will still see a big performance improvement, even  at the lower setting, than you get with the P-120.
Regards,
Ralph



0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This paper addresses the security of Sennheiser DECT Contact Center and Office (CC&O) headsets. It describes the DECT security chain comprised of “Pairing”, “Per Call Authentication” and “Encryption”, which are all part of the standard DECT protocol.
This article outlines why you need to choose a backup solution that protects your entire environment – including your VMware ESXi and Microsoft Hyper-V virtualization hosts – not just your virtual machines.
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question