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#1
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XP DDR memory not listed correctly
My daily pc has 1gb DDR400 (2 512mb sticks)
I was tossing an old PC and took it's memory to add here, so I added another 1gb DDR400 last night (2 -512's) and when I rebooted it shows as DDR333 in splash screen / XP . I gotta run now, but wondering - other than reseat/swap around to isolate etc, any tricks for troubleshooting why speed shows as incorrect ? I've never run into this before. Thanks |
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#2
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XP DDR memory not listed correctly
From: "- Bobb -"
My daily pc has 1gb DDR400 (2 512mb sticks) I was tossing an old PC and took it's memory to add here, so I added another 1gb DDR400 last night (2 -512's) and when I rebooted it shows as DDR333 in splash screen / XP . I gotta run now, but wondering - other than reseat/swap around to isolate etc, any tricks for troubleshooting why speed shows as incorrect ? I've never run into this before. Thanks Upgrade the BIOS. It may not be recognizing the PC3200 RAM. -- Dave Multi-AV Scanning Tool - http://multi-av.thespykiller.co.uk http://www.pctipp.ch/downloads/dl/35905.asp |
#3
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XP DDR memory not listed correctly
- Bobb - wrote:
My daily pc has 1gb DDR400 (2 512mb sticks) I was tossing an old PC and took it's memory to add here, so I added another 1gb DDR400 last night (2 -512's) and when I rebooted it shows as DDR333 in splash screen / XP . I gotta run now, but wondering - other than reseat/swap around to isolate etc, any tricks for troubleshooting why speed shows as incorrect ? I've never run into this before. Thanks Your system has an AMD processor, and this is normal. Clock speed is turned down on the RAM bus, when moving from two sticks to four sticks. The load compensation changes the system from DDR400 to DDR333 speed setting. Later RAM standards (DDR2/DDR3 versus your DDR), don't have this problem to nearly the same extent. You can use some custom RAM settings, to try to work around it, but then you need to do careful RAM testing before using the system for serious work. Paul |
#4
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XP DDR memory not listed correctly
Bobb wrote:
My daily pc has 1gb DDR400 (2 512mb sticks) I was tossing an old PC and took it's memory to add here, so I added another 1gb DDR400 last night (2 -512's) and when I rebooted it shows as DDR333 in splash screen / XP . Some mobos have to reduce their clock rate when you populate, say, more than 3 memory slots. The mobo cannot support the extra load (power) at the higher clock rate. Another restriction may be that you lose dual channel mode if you go with more than 2 modules (i.e. more than 1 bank). Just because the mobo has 4 slots doesn't mean there isn't a consequence of populating more than 2 of them. You never mentioned the brand and model of mobo. Read its manual on memory support to see if there are restrictions or reductions incurred on memory configurations. Sometimes they just mention in a paragraph the restrictions. Sometimes they provide a table showing what works with what config. NOTE: For future reference and posting, when cross-posting to multiple newsgroups, they should be related. This is not a OS (Windows XP) issue but instead a hardware issue. The correct cross-post group is microsoft.public.windowsxp.hardware, not the windowsxp.general group. |
#5
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XP DDR memory not listed correctly
Paul wrote:
Bobb wrote: My daily pc has 1gb DDR400 (2 512mb sticks) ... Your system has an AMD processor, and this is normal. Where did the OP mention that detail? Where do you see any details regarding their mobo? Where do you see the brand and model specified? |
#6
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XP DDR memory not listed correctly
VanguardLH wrote:
Paul wrote: Bobb wrote: My daily pc has 1gb DDR400 (2 512mb sticks) ... Your system has an AMD processor, and this is normal. Where did the OP mention that detail? Where do you see any details regarding their mobo? Where do you see the brand and model specified? I deduced it all, and await confirmation of the missing details. Only AMD does this. My Intel chipset DDR400 motherboard has no such penalty, and that's how I know the processor is AMD. I can stick two or four matched sticks in the 875P based motherboard, and it always runs at DDR400. There was a claim that chipset runs Command Rate 2 under all conditions, but without an exposed BIOS setting, it's hard to know that for sure. Lots of stuff about chipsets, can only be determined with an oscilloscope (due to the limitations of what is stated in data sheets). The OP stated a transition from two sticks to four sticks, and a change from DDR400 automatically to DDR333. And that pattern matches AMD S939 processors. Paul |
#7
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XP DDR memory not listed correctly
From: "Paul"
VanguardLH wrote: Paul wrote: Bobb wrote: My daily pc has 1gb DDR400 (2 512mb sticks) ... Your system has an AMD processor, and this is normal. Where did the OP mention that detail? Where do you see any details regarding their mobo? Where do you see the brand and model specified? I deduced it all, and await confirmation of the missing details. Only AMD does this. My Intel chipset DDR400 motherboard has no such penalty, and that's how I know the processor is AMD. I can stick two or four matched sticks in the 875P based motherboard, and it always runs at DDR400. There was a claim that chipset runs Command Rate 2 under all conditions, but without an exposed BIOS setting, it's hard to know that for sure. Lots of stuff about chipsets, can only be determined with an oscilloscope (due to the limitations of what is stated in data sheets). The OP stated a transition from two sticks to four sticks, and a change from DDR400 automatically to DDR333. And that pattern matches AMD S939 processors. Paul With all due respect, then it would have been more appropriate to start off... "If your system has an AMD processor, then this is a normal condition because..." -- Dave Multi-AV Scanning Tool - http://multi-av.thespykiller.co.uk http://www.pctipp.ch/downloads/dl/35905.asp |
#8
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XP DDR memory not listed correctly
On 24/05/2012 8:26 AM, - Bobb - wrote:
My daily pc has 1gb DDR400 (2 512mb sticks) I was tossing an old PC and took it's memory to add here, so I added another 1gb DDR400 last night (2 -512's) and when I rebooted it shows as DDR333 in splash screen / XP . I gotta run now, but wondering - other than reseat/swap around to isolate etc, any tricks for troubleshooting why speed shows as incorrect ? I've never run into this before. Do all 4 sticks show as DDR333, or do some show as DDR333 while others show DDR400? What I would do is boot up with only the newer pair, and see if those by themselves show up as DDR400. If not, then there might be some incompatibility between them and your system. Yousuf Khan |
#9
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XP DDR memory not listed correctly
"Paul" wrote in message ... VanguardLH wrote: Paul wrote: Bobb wrote: My daily pc has 1gb DDR400 (2 512mb sticks) ... Your system has an AMD processor, and this is normal. Where did the OP mention that detail? Where do you see any details regarding their mobo? Where do you see the brand and model specified? I deduced it all, and await confirmation of the missing details. Only AMD does this. My Intel chipset DDR400 motherboard has no such penalty, and that's how I know the processor is AMD. I can stick two or four matched sticks in the 875P based motherboard, and it always runs at DDR400. There was a claim that chipset runs Command Rate 2 under all conditions, but without an exposed BIOS setting, it's hard to know that for sure. Lots of stuff about chipsets, can only be determined with an oscilloscope (due to the limitations of what is stated in data sheets). The OP stated a transition from two sticks to four sticks, and a change from DDR400 automatically to DDR333. And that pattern matches AMD S939 processors. Paul EXACTLY right ! ASUS mb with an AMD 939 cpu. Boy, am I glad I asked here first. It made no sense to me that 2 sticks to 4 would change clock speed. I don't NEED 2gb but I was tossing a few Celeron PC's and took their DDR400 mem sticks and stuck them in here rather than recycle it all. Thanks very much. |
#10
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XP DDR memory not listed correctly
"VanguardLH" wrote in message ... Bobb wrote: My daily pc has 1gb DDR400 (2 512mb sticks) I was tossing an old PC and took it's memory to add here, so I added another 1gb DDR400 last night (2 -512's) and when I rebooted it shows as DDR333 in splash screen / XP . .... NOTE: For future reference and posting, when cross-posting to multiple newsgroups, they should be related. This is not a OS (Windows XP) issue but instead a hardware issue. The correct cross-post group is microsoft.public.windowsxp.hardware, not the windowsxp.general group. Sorry but I didn't know of the .hardware group - I had used/mapped the xp group though. |
#11
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XP DDR memory not listed correctly
"Paul" wrote in message
... VanguardLH wrote: Paul wrote: Bobb wrote: My daily pc has 1gb DDR400 (2 512mb sticks) ... Your system has an AMD processor, and this is normal. Where did the OP mention that detail? Where do you see any details regarding their mobo? Where do you see the brand and model specified? I deduced it all, and await confirmation of the missing details. Only AMD does this. My Intel chipset DDR400 motherboard has no such penalty, and that's how I know the processor is AMD. I can stick two or four matched sticks in the 875P based motherboard, and it always runs at DDR400. There was a claim that chipset runs Command Rate 2 under all conditions, but without an exposed BIOS setting, it's hard to know that for sure. Lots of stuff about chipsets, can only be determined with an oscilloscope (due to the limitations of what is stated in data sheets). The OP stated a transition from two sticks to four sticks, and a change from DDR400 automatically to DDR333. And that pattern matches AMD S939 processors. Paul Good catch, Paul. I had nearly forgotten about this little detail about AMD processors at that time. -- Glen Ventura MS MVP Oct. 2002 - Sept. 2009 CompTIA A+ |
#12
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XP DDR memory not listed correctly
I recall something call some characteristic in memory called "spd" which has
something to do with speed detection. "glee" wrote in message ... "Paul" wrote in message ... VanguardLH wrote: Paul wrote: Bobb wrote: My daily pc has 1gb DDR400 (2 512mb sticks) ... Your system has an AMD processor, and this is normal. Where did the OP mention that detail? Where do you see any details regarding their mobo? Where do you see the brand and model specified? I deduced it all, and await confirmation of the missing details. Only AMD does this. My Intel chipset DDR400 motherboard has no such penalty, and that's how I know the processor is AMD. I can stick two or four matched sticks in the 875P based motherboard, and it always runs at DDR400. There was a claim that chipset runs Command Rate 2 under all conditions, but without an exposed BIOS setting, it's hard to know that for sure. Lots of stuff about chipsets, can only be determined with an oscilloscope (due to the limitations of what is stated in data sheets). The OP stated a transition from two sticks to four sticks, and a change from DDR400 automatically to DDR333. And that pattern matches AMD S939 processors. Paul Good catch, Paul. I had nearly forgotten about this little detail about AMD processors at that time. -- Glen Ventura MS MVP Oct. 2002 - Sept. 2009 CompTIA A+ |
#13
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XP DDR memory not listed correctly
Docster wrote:
I recall something call some characteristic in memory called "spd" which has something to do with speed detection. SPD stands for serial presence detect. It's a chip that holds the Plug and Play information for the DIMM, including memory size and memory timing information. It sits on a serial bus (SMBUS) and is read out by the BIOS when the computer starts. The serial bus runs at a very low speed, like around 10KHz (whereas, more normally, it would run at 400KHz). http://upload.wikimedia.org/wikipedi.../SPD_SDRAM.jpg ( http://en.wikipedia.org/wiki/Serial_presence_detect ) But the choice of DIMM memory operating speed, is up to the BIOS. The SPD can give info on timing settings for operating at DDR333 or DDR400, but the BIOS makes the decision as to what speed to run things at. And the "down clocking" on the S939, is a policy recommended by AMD, rather than being dreamed up by the manufacturer of the motherboard. On one AMD motherboard from that era, the user manual even contains a copy of the timing table from an AMD document, as if to say "it isn't our fault it works this way" :-) I presume they did that, so they'd get fewer whiny phone calls at tech support. Paul |
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