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Memory: Does it matter if big DDRs are firsr or second?
On 12/17/10 19:07, mm wrote:
On Wed, 15 Dec 2010 22:17:24 -0500, Ben wrote: On 12/15/2010 9:52 PM, mm wrote: Memory: Does it matter if big DDRs are firsr or second? Posted to alt.comp.hardware and alt.sys.pc-clone.dell, since the computer is a Dell and I started the topic in that group, but have broader questions now. I have two 512M and two 1G DDR[1]s and they are the same speed PC2700, the same 333, the same CL 2.5, the same non-ECC and assume everything else the same except the brand and size. Does it make a difference if the big pair goes in the first pair of slots, or if the small pair does??? Is this true for DDR2 and DDR3 also? Just to be perfectly clear, if you are talking about Dell Precision 360, Dimension 4600, Optiplex GX270, or Dimension 8300, It was meant as a general question. I'm 99% sure I've read that *faster* memory should go in the first pair of slots, and that makes sense so that one should use the faster memory most of the time. But here the speed is the same, only the *size* is different, so does it matter which one is first? two memory slots have black DIMM clips and two have white clips. A matched pair has to go in a pair of DIMM slots with the same color of clips. Yes, thanks, the computer I'm working on now is a Dell 4600 and the manual made that clear. As a rule, I install the larger capacity memory in the "first" pair of slots. But is that a personal practice, or maybe a habit left over from fast vs. slow memory, or is it really based on some benchmark testing or recommended by engineers or so forth? IIRC (from an admittedly failing memory), when you mix faster & slower DIMMs, *all* memory runs at the slower speed (tends to keep things in sync internally - if you were moving data from faster to slower memory and tried to use the 2 different speeds, fun might ensue g). |
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Memory: Does it matter if big DDRs are firsr or second?
On Sun, 19 Dec 2010 11:53:21 -0500, Ben Myers
wrote: On 12/17/2010 10:52 PM, mm wrote: On Fri, 17 Dec 2010 19:07:59 -0800, wrote: mm wrote: On Wed, 15 Dec 2010 22:17:24 -0500, Ben wrote: On 12/15/2010 9:52 PM, mm wrote: Memory: Does it matter if big DDRs are firsr or second? Posted to alt.comp.hardware and alt.sys.pc-clone.dell, since the computer is a Dell and I started the topic in that group, but have broader questions now. I have two 512M and two 1G DDR[1]s and they are the same speed PC2700, the same 333, the same CL 2.5, the same non-ECC and assume everything else the same except the brand and size. Does it make a difference if the big pair goes in the first pair of slots, or if the small pair does??? Is this true for DDR2 and DDR3 also? Just to be perfectly clear, if you are talking about Dell Precision 360, Dimension 4600, Optiplex GX270, or Dimension 8300, It was meant as a general question. I'm 99% sure I've read that *faster* memory should go in the first pair of slots, and that makes sense so that one should use the faster memory most of the time. How did you determine that? I didn't determine it. "I'm 99% sure that I read it." It makes sense, to me, and a reason it makes sense would be so that it used faster memory more often that way. The first memory allocated may or may not be from any particular address space and the area most accessed may or may not be related to the address space assigned to that function? yes? no? I don't know. You end your sentence with a question mark, so I guess you're not saying one way or the other. My concentration was on whether large DIMMs should be first or not. If the answer to your question means that it doesn't matter if faster DIMMs are first, then it likely doesn't matter if large DIMMs are first. But here the speed is the same, only the *size* is different, so does it matter which one is first? two memory slots have black DIMM clips and two have white clips. A matched pair has to go in a pair of DIMM slots with the same color of clips. Yes, thanks, the computer I'm working on now is a Dell 4600 and the manual made that clear. As a rule, I install the larger capacity memory in the "first" pair of slots. But is that a personal practice, or maybe a habit left over from fast vs. slow memory, or is it really based on some benchmark testing or recommended by engineers or so forth? Which is the "first" pair of slots? Usually the one nearest to the CPU and its mate with the same color of clips. But when in doubt, read the owner's manual. Same for DDR2 and DDR3. These boards all have Intel 865 or 875 chipsets, which dictate the memory configuration rules. Way back when I worked in mainframe software development, we and tech support used to write "RTFB" responses, telling customers the answers to their questions or solutions to their problems and telling them to read the ^^&&*(_* book, where the answer could be found... Ben Myers The Dell owners manual didn't go into such detail. Thanks again. It doesn't matter if faster DIMMs are first. See my other response. It MAY matter if large DIMMs are first. Again, a read of the owner's manual or the chipset spec will tell if it does matter... Ben Myers Okay. Thanks again. For all your help, and thanks to others who replies. |
#13
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Memory: Does it matter if big DDRs are firsr or second?
On 12/19/2010 1:07 PM, Bob Villa wrote:
On Dec 19, 10:50 am, Ben wrote: On 12/17/2010 7:07 PM, mm wrote: On Wed, 15 Dec 2010 22:17:24 -0500, Ben wrote: On 12/15/2010 9:52 PM, mm wrote: Memory: Does it matter if big DDRs are firsr or second? Posted to alt.comp.hardware and alt.sys.pc-clone.dell, since the computer is a Dell and I started the topic in that group, but have broader questions now. I have two 512M and two 1G DDR[1]s and they are the same speed PC2700, the same 333, the same CL 2.5, the same non-ECC and assume everything else the same except the brand and size. Does it make a difference if the big pair goes in the first pair of slots, or if the small pair does??? Is this true for DDR2 and DDR3 also? Just to be perfectly clear, if you are talking about Dell Precision 360, Dimension 4600, Optiplex GX270, or Dimension 8300, It was meant as a general question. I'm 99% sure I've read that *faster* memory should go in the first pair of slots, and that makes sense so that one should use the faster memory most of the time. But here the speed is the same, only the *size* is different, so does it matter which one is first? two memory slots have black DIMM clips and two have white clips. A matched pair has to go in a pair of DIMM slots with the same color of clips. Yes, thanks, the computer I'm working on now is a Dell 4600 and the manual made that clear. As a rule, I install the larger capacity memory in the "first" pair of slots. But is that a personal practice, or maybe a habit left over from fast vs. slow memory, or is it really based on some benchmark testing or recommended by engineers or so forth? Which is the "first" pair of slots? Usually the one nearest to the CPU and its mate with the same color of clips. But when in doubt, read the owner's manual. Same for DDR2 and DDR3. These boards all have Intel 865 or 875 chipsets, which dictate the memory configuration rules. Way back when I worked in mainframe software development, we and tech support used to write "RTFB" responses, telling customers the answers to their questions or solutions to their problems and telling them to read the ^^&&*(_* book, where the answer could be found... Ben Myers The Dell owners manual didn't go into such detail. Thanks again. There is no difference whatsoever placing faster memory in the first DIMM slots or the second ones. "Faster" memory is rated to run at a faster speed than slower memory, but it can and does also run at slower speeds. The speed at which memory operates is dictated by the motherboard and CPU, not by the memory itself which is a passive component. For example, if you put PC3200 memory in a system with a CPU operating with a 533MHz front side bus (e.g. the hot-running 3.06 GHz P4), the memory operates at the lower PC2100 speed... Ben Myers Ben, wouldn't that lower speed instance be PC2700? Not in the example I used. PC2100 runs at 266MHz speed, exactly half of 533MHz. Because the memory is double data rate (DDR) each clock supplies two fetches of data, one from each of the dual channels, assuming that the memory is installed to allow dual channel operation. But if you install PC2700 in a system with a CPU running with 800MHz front side bus, the 865 or 875 chipset mediates the difference between the PC2700 speed and the FSB. So the slower memory runs OK with the faster CPU... Ben Myers |
#14
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Memory: Does it matter if big DDRs are firsr or second?
On 12/19/2010 5:23 PM, Tony Harding wrote:
On 12/17/10 19:07, mm wrote: On Wed, 15 Dec 2010 22:17:24 -0500, Ben wrote: On 12/15/2010 9:52 PM, mm wrote: Memory: Does it matter if big DDRs are firsr or second? Posted to alt.comp.hardware and alt.sys.pc-clone.dell, since the computer is a Dell and I started the topic in that group, but have broader questions now. I have two 512M and two 1G DDR[1]s and they are the same speed PC2700, the same 333, the same CL 2.5, the same non-ECC and assume everything else the same except the brand and size. Does it make a difference if the big pair goes in the first pair of slots, or if the small pair does??? Is this true for DDR2 and DDR3 also? Just to be perfectly clear, if you are talking about Dell Precision 360, Dimension 4600, Optiplex GX270, or Dimension 8300, It was meant as a general question. I'm 99% sure I've read that *faster* memory should go in the first pair of slots, and that makes sense so that one should use the faster memory most of the time. But here the speed is the same, only the *size* is different, so does it matter which one is first? two memory slots have black DIMM clips and two have white clips. A matched pair has to go in a pair of DIMM slots with the same color of clips. Yes, thanks, the computer I'm working on now is a Dell 4600 and the manual made that clear. As a rule, I install the larger capacity memory in the "first" pair of slots. But is that a personal practice, or maybe a habit left over from fast vs. slow memory, or is it really based on some benchmark testing or recommended by engineers or so forth? IIRC (from an admittedly failing memory), when you mix faster & slower DIMMs, *all* memory runs at the slower speed (tends to keep things in sync internally - if you were moving data from faster to slower memory and tried to use the 2 different speeds, fun might ensue g). Your brain has not had a parity failure yet. Must be ECC! Correct... Ben |
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