| Author |
problem with DDRAM
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| I have been having problem with P4 for quite
sometimes now.
I discovered most of the P4 either CLONE or
BRANDED (COMPAQ) do have a memory leak.
I concluded that the causes of this is the DDRAM after a test was carried out by replacing the DDRAM with SDRAM on a motherboard that has both slot. The SDRAM seems to work better and faster than the DDRAM.
Do any one have such a similar experience | |
| azimuth40 2003-12-26, 9:53 pm |
| Well I don't know what it is that you have but a memory leak is a software problem not a hardware problem. A memory leak is caused by an operating system refusing to take back allocated memory or a program failing to return it when done. After 20 years of programming memory leaks are a good portion of my nightmares and I understand them pretty well.
As far as speed between sdr sdram and ddr sdram my own tests and and all of the major benchmark sites tend to disagree with your statement. In fact I have two identical systems in my lab with the exception that one has 512MB of DDR-SDRAM and one has 512MB of SDR-SDRAM.
On things like lengthy database re-indexing or statistical analysis runs, there is a difference. The more memory intensive the task, the larger the difference. Basically anything that causes constant CPU cache misses. What are you testing with? Try something like sysoft sandra. It is loaded with reference systems so you can do a comparison.
Recent reports have DDR holding almost 60 percent of the memory market. Someone would have spotted such a general problem long before now.
If you are having problems it could be a BIOS problem mis-configuring your memory subsystem. If you do not have use SPD set in the CMOS then you may have picked un-optimized settings. | |
| Gundyman 2003-12-27, 10:20 pm |
| Did u try to install the DDRAM on other PC? Is it still the same issue?
Memory leak is not often happened. Not with current memory technology.. | |
| DaDnDe 2003-12-28, 2:00 am |
| azimuth40 is right on the money.
when you say ddram i assumme you are talking about DDR (double data rate). if so, there is no sdram that will transfer info as fast as DDR. DDR transfers data at twice its rated rate. iow, DDR 400 will run on an 800Mhz bus, 266 and 333 will run on 533Mhz bus and so on. sdram doesnt have this advantage and that is why that option on newer boards is going away. the two types of ram are not compatible and require different slots.
what is the bus speed of your system and the memory speed? also when swapping ram, you may need to set memory options in your Bios. this is rare anymore, but there are boards that give you the option(this is mostly for oc situations)with a man v auto config switch.
i have not had much experience with boards that take both kinds of memory. so i cant tell you what to do in your situation, but the two memory types run completely different, so there has to be some sort of setting that needs to be looked at. i guess its possible that there is some sort of autosensor that determines which socket is being used and sets board accordingly, but i would double check to make sure. | |
| Tarzanboy 2003-12-28, 2:07 am |
| Well, it is not a "memory leak" per se.
http://www.faqs.org/docs/jargon/M/memory-leak.html
It sounds like either you have some bad memory, some bad circuitry on the motherboard or a BIOS that doesn't utilize the memory properly. Perhaps you should run a diagnostic utility on it and verify that the BIOS is the latest available version.
Cheers,
TB | |
| azimuth40 2003-12-28, 9:55 am |
| quote:
Originally posted by DaDnDe
i have not had much experience with boards that take both kinds of memory. so i cant tell you what to do in your situation, but the two memory types run completely different, so there has to be some sort of setting that needs to be looked at. i guess its possible that there is some sort of autosensor that determines which socket is being used and sets board accordingly, but i would double check to make sure.
The auto sensor has always existed. Pick up a DIMM, check it closely and you will find an extremely tiny chip. This is the Serial Presence Detect (SPD option in BIOS) ROM. This ROM outputs all the information that the BIOS needs to know to program the North Bridge memory control circuits.
SPD is one of those kind of secretive things unless you are a dimm designer. People give you a definition and thats all. Things like that interest me from one of my past lives as a designer. For those interested Texas Instruments has a 93 page technical reference PDF here.
http://focus.ti.com/lit/ug/smmu001/smmu001.pdf
P.S. I forgot that the TI PDF does not have the DDR codes only SDR. You can find the DDR updates in this article at simmtester.
http://www.simmtester.com/page/news...+Table+&num=101 | |
| DaDnDe 2003-12-28, 4:10 pm |
| great info!! thanks...
i love it when someone jumps on me for mis imformation... | |
| azimuth40 2003-12-28, 5:03 pm |
| quote:
Originally posted by DaDnDe
great info!! thanks...
i love it when someone jumps on me for mis imformation...
Oh no, I try to never jump because it comes back to haunt you. No one can carry everything around in their head. To those that don't know me it sometimes looks like that. I am often guilty of submitting copious amounts of references but this was always required when I was in the trenches. A room full of hardware or software engineers can be brutal.
I simply have a text database that I have used for the last 10 or 12 years to research lots of program design type things. It came from early work that I did for hazardous materials tracking; lots of text to keep track of. One section gets loaded with most everything technical that I run across. Links if I can, the text if I can't. Dynamic compression on the fly etc. and it is still over a gig. I hit it first before I hit google. | |
| DaDnDe 2003-12-28, 5:27 pm |
| oh i didnt take any offense to what you said. i was just saying that im glad that someone has constructive comments as you have instead of what i have seen a lot of which is flaming someone with out any info to back up what they say either from lack of specific examples or just plain too lazy to type anything but a two sentence response.
i greatly appreciate the information that you bring to this forum. that is the reason why i go to any forum. that is to help people with what i know and also to gain extra knowledge and insight into things that i want to know.
p.s. was that a run on sentence?? | |
| azimuth40 2003-12-28, 5:53 pm |
| quote:
Originally posted by DaDnDe
oh i didnt take any offense to what you said. i was just saying that im glad that someone has constructive comments as you have instead of what i have seen a lot of which is flaming someone with out any info to back up what they say either from lack of specific examples or just plain too lazy to type anything but a two sentence response.
i greatly appreciate the information that you bring to this forum. that is the reason why i go to any forum. that is to help people with what i know and also to gain extra knowledge and insight into things that i want to know.
p.s. was that a run on sentence??
Shorter than most of mine  |
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