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#1
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ddr1 memory
i got the third stick of ddr1 memory.
putting it in the system. i run a memtest. u see the cl is 2.5 not 3 which is no the stick. the bios is set to auto. should i change the bios to maual and change it back, or will it run ok with that setting. (run boinc on the system at 100%) stick is kingston valueram. |
#2
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ddr1 memory
john wrote:
i got the third stick of ddr1 memory. putting it in the system. i run a memtest. u see the cl is 2.5 not 3 which is no the stick. the bios is set to auto. should i change the bios to maual and change it back, or will it run ok with that setting. (run boinc on the system at 100%) stick is kingston valueram. If the memory settings in the BIOS are "Auto", and you add multiple sticks of memory, the BIOS will do a good job of selecting settings to use. If you set the BIOS to "Manual" and enter the numbers yourself, then *you* are responsible for selecting the right numbers to use. To make an example 1) I have one stick of memory with CAS2.5 2) I have a second stick of memory with CAS3 3) My BIOS memory section is "Auto" then the BIOS will set the memory controller to CAS3. CAS3 is exactly what is needed for (2). CAS3 is slower than the CAS2.5 in (1), so that stick is happy also. The settings selected apply to all memory sticks at the same time. The computer doesn't feed each stick different values. The sticks all share the same hardware busses, so the settings are shared values as well. The BIOS tries to select settings slow enough, so that the slowest of all the memory sticks will be satisfied and run well. HTH, Paul |
#3
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ddr1 memory
the setting are set as auto in the bios.
when i put the new stick in and i saw the setting were now lower. was wondering if it would be a problem. "Paul" wrote in message ... john wrote: i got the third stick of ddr1 memory. putting it in the system. i run a memtest. u see the cl is 2.5 not 3 which is no the stick. the bios is set to auto. should i change the bios to maual and change it back, or will it run ok with that setting. (run boinc on the system at 100%) stick is kingston valueram. If the memory settings in the BIOS are "Auto", and you add multiple sticks of memory, the BIOS will do a good job of selecting settings to use. If you set the BIOS to "Manual" and enter the numbers yourself, then *you* are responsible for selecting the right numbers to use. To make an example 1) I have one stick of memory with CAS2.5 2) I have a second stick of memory with CAS3 3) My BIOS memory section is "Auto" then the BIOS will set the memory controller to CAS3. CAS3 is exactly what is needed for (2). CAS3 is slower than the CAS2.5 in (1), so that stick is happy also. The settings selected apply to all memory sticks at the same time. The computer doesn't feed each stick different values. The sticks all share the same hardware busses, so the settings are shared values as well. The BIOS tries to select settings slow enough, so that the slowest of all the memory sticks will be satisfied and run well. HTH, Paul |
#4
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ddr1 memory
this is the setting that the bios has set at boot time.
2.5-3-3-7 from a memtest program. |
#5
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ddr1 memory
john wrote:
this is the setting that the bios has set at boot time. 2.5-3-3-7 from a memtest program. If you had a stick with a rating of 3-3-3-8, then the BIOS would have made a mistake. If all the sticks are CAS 2.5 or CAS 2.0, then that would be a good setting. You'd really need to give a full description of each stick. You can get details from CPUZ. Run the .exe. Go to "About" tab. Select "Register Dump txt" and it will make a text file with the results for your computer. http://www.cpuid.com/cpuz.php ******* This is a selective snip from my cpuz.txt register dump. The "DIMM" part, is what the DIMM is "advertising" as options. The SPD chip on the DIMM, holds this timing table, and CPUZ can read it out. DIMM #1 Timings table Frequency (MHz) 200 266 333 CAS# 3.0 4.0 5.0 RAS# to CAS# delay 3 4 5 RAS# Precharge 3 4 5 TRAS 9 12 15 TRC 12 16 20 Copy over each DIMM table. My second DIMM is the same as the first. DIMM #2 Timings table Frequency (MHz) 200 266 333 CAS# 3.0 4.0 5.0 RAS# to CAS# delay 3 4 5 RAS# Precharge 3 4 5 TRAS 9 12 15 TRC 12 16 20 The section above that, called "Chipset", shows what my BIOS selected as operating conditions Chipset Northbridge VIA PT880 Pro rev. 00 Southbridge VIA VT8237S rev. 00 Graphic Interface AGP AGP Revision 3.0 AGP Transfer Rate 8x AGP SBA supported, enabled Memory Type DDR2 Memory Size 2048 MBytes Channels Dual Memory Frequency 266.0 MHz (3:4) ----- 266*2 means DDR2-533 in my case DRAM Interleave 4-way CAS# 3.0 \ RAS# to CAS# 3 \___ BIOS is using 3-3-3-12, because RAS# Precharge 3 / I forced it to do that :-) Cycle Time (tRAS) 12 / Command Rate 1T ******* If you want comments on your particular settings, then provide some info from the CPUZ register dump. Paul |
#6
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ddr1 memory
this is the dump.
Chipset ------------------------------------------------------------------------------ Northbridge NVIDIA GeForce 6100 rev. A2 Southbridge NVIDIA nForce 410/430 MCP rev. A3 Memory Type DDR Memory Size 2560 MBytes Channels Single Memory Frequency 157.9 MHz (CPU/14) CAS# 2.5 RAS# to CAS# 3 RAS# Precharge 3 Cycle Time (tRAS) 7 Bank Cycle Time (tRC) 10 DRAM Idle Timer 16 Command Rate 2T Memory SPD ------------------------------------------------------------------------------ DIMM #1 General Memory type DDR Manufacturer (ID) Kingston (7F98000000000000) Size 1024 MBytes Max bandwidth PC3200 (200 MHz) Part number K Serial number 732698DC Manufacturing date Week 24/Year 07 Attributes Number of banks 2 Data width 64 bits Correction None Registered no Buffered no Nominal Voltage 2.50 Volts EPP no XMP no Timings table Frequency (MHz) 166 200 CAS# 2.5 3.0 RAS# to CAS# delay 3 3 RAS# Precharge 3 3 TRAS 7 8 DIMM #2 General Memory type DDR Manufacturer (ID) Kingston (7F98000000000000) Size 512 MBytes Max bandwidth PC3200 (200 MHz) Part number K Serial number 600FC249 Manufacturing date Week 49/Year 05 Attributes Number of banks 2 Data width 64 bits Correction None Registered no Buffered no Nominal Voltage 2.50 Volts EPP no XMP no Timings table Frequency (MHz) 133 166 200 CAS# 2.0 2.5 3.0 RAS# to CAS# delay 2 3 3 RAS# Precharge 2 3 3 TRAS 6 7 8 DIMM #3 General Memory type DDR Manufacturer (ID) Kingston (7F98000000000000) Size 1024 MBytes Max bandwidth PC3200 (200 MHz) Part number K Serial number 64316877 Manufacturing date Week 12/Year 06 Attributes Number of banks 2 Data width 64 bits Correction None Registered no Buffered no Nominal Voltage 2.50 Volts EPP no XMP no Timings table Frequency (MHz) 133 166 200 CAS# 2.0 2.5 3.0 RAS# to CAS# delay 2 3 3 RAS# Precharge 2 3 3 TRAS 6 7 8 |
#7
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ddr1 memory
john wrote:
this is the dump. Chipset ------------------------------------------------------------------------------ Northbridge NVIDIA GeForce 6100 rev. A2 Southbridge NVIDIA nForce 410/430 MCP rev. A3 Memory Type DDR Memory Size 2560 MBytes Channels Single Memory Frequency 157.9 MHz (CPU/14) CAS# 2.5 RAS# to CAS# 3 RAS# Precharge 3 Cycle Time (tRAS) 7 Bank Cycle Time (tRC) 10 DRAM Idle Timer 16 Command Rate 2T Memory SPD ------------------------------------------------------------------------------ DIMM #1 General Memory type DDR Manufacturer (ID) Kingston (7F98000000000000) Size 1024 MBytes Max bandwidth PC3200 (200 MHz) Part number K Serial number 732698DC Manufacturing date Week 24/Year 07 Attributes Number of banks 2 Data width 64 bits Correction None Registered no Buffered no Nominal Voltage 2.50 Volts EPP no XMP no Timings table Frequency (MHz) 166 200 CAS# 2.5 3.0 RAS# to CAS# delay 3 3 RAS# Precharge 3 3 TRAS 7 8 DIMM #2 General Memory type DDR Manufacturer (ID) Kingston (7F98000000000000) Size 512 MBytes Max bandwidth PC3200 (200 MHz) Part number K Serial number 600FC249 Manufacturing date Week 49/Year 05 Attributes Number of banks 2 Data width 64 bits Correction None Registered no Buffered no Nominal Voltage 2.50 Volts EPP no XMP no Timings table Frequency (MHz) 133 166 200 CAS# 2.0 2.5 3.0 RAS# to CAS# delay 2 3 3 RAS# Precharge 2 3 3 TRAS 6 7 8 DIMM #3 General Memory type DDR Manufacturer (ID) Kingston (7F98000000000000) Size 1024 MBytes Max bandwidth PC3200 (200 MHz) Part number K Serial number 64316877 Manufacturing date Week 12/Year 06 Attributes Number of banks 2 Data width 64 bits Correction None Registered no Buffered no Nominal Voltage 2.50 Volts EPP no XMP no Timings table Frequency (MHz) 133 166 200 CAS# 2.0 2.5 3.0 RAS# to CAS# delay 2 3 3 RAS# Precharge 2 3 3 TRAS 6 7 8 OK, so that is likely an AMD motherboard where the processor has a built-in memory controller. Sometimes, the BIOS drops the clock rate, in accordance with the bus driving capabilities of the AMD processor. If you use too many sticks in such a computer, the memory bus is slowed down. Right now, it is running DDR316 and using Command Rate 2T (instead of 1T), so would be pretty slow. To give an example, if you had an AMD board with a S754 processor, there might be three memory slots. The most you'd want to use, would be two slots, like slot one and slot three. Then, select as large a DIMM as can be supported. Say, 2x1GB sticks. That might represent the best compromise between speed and capacity. Going back to your particulars - The memory controller is 157.9MHz right now. x2 = DDR316 The AMD processor's memory controller is set up, to use a clock value below the limit, so that there won't be a problem. In another situation, the computer may have used DDR333 in that situation, but the AMD clock logic has limited granularity. (I think it might have something to do with the core multiplier being odd or even or something like that.) Anyway, you're running DDR316 2.5-3-3-7 Now, we look at what your DIMMs are advertising as their ratings. 1024MB 512MB 1024MB -- DIMM #1 --|----- DIMM #2 ----|----- DIMM #3 ---- DDR333 DDR400 |DDR266 DDR333 DDR400|DDR266 DDR333 DDR400 Frequency (MHz) 166 200 |133 166 200 |133 166 200 CAS# 2.5 3.0 |2.0 2.5 3.0 |2.0 2.5 3.0 RAS# to CAS# 3 3 |2 3 3 |2 3 3 RAS# Precharge 3 3 |2 3 3 |2 3 3 TRAS 7 8 |6 7 8 |6 7 8 So the nearest setting to DDR316 in the DIMM tables, is DDR333. And at DDR333, all sticks run 2.5-3-3-7, so the BIOS has done precisely the right thing. You can try pulling DIMM #2 (with all power off). Run the computer with 2GB total memory. If you download this Asus manual, this is a manual for an early S754 board with three slots. See "Table 1" on PDF page 21. It shows a loading versus memory bus speed table. Line 18 in the table suggests that two double sided DIMMs can run at DDR400, if plugged into slot 1 and slot 3. If you remove your DIMM#2, the BIOS should run your system at DDR400 3-3-3-8. (As all tables above are rated at 3-3-3-8 at that speed.) ftp://ftp.asus.com/pub/ASUS/mb/sock7.../e1529_k8v.pdf I'm assuming this is a S754 system, and I'm not positive that is the case. But if it was S939, there'd be four slots. Paul |
#8
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ddr1 memory
i pulled the 512 and it is back to normal.
so i guess the 512 is going bad. thanks. |
#9
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ddr1 memory
john wrote:
i pulled the 512 and it is back to normal. so i guess the 512 is going bad. thanks. No, the computer adjusts the clock rate, according to bus loading. Three sticks of memory is a heavy load for the bus, which is why it is using slow settings. By installing only two sticks, a higher clock speed can be used. So your 2x1GB is a better way to run the computer, than 2x1GB+512MB. 2x1GB would be the best compromise between memory capacity and operating speed. Paul |
#10
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ddr1 memory
ok, i will just have the 2- 1gb in.
thanks. |
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