BillParrish
Supreme [H]ardness
- Joined
- Aug 25, 2006
- Messages
- 7,519
From the P965 application notes for the MCH. emphasis is my addition.
For example, a DDR2-667 DIMM with supported 5-5-5 speed bin timings installed with
a DDR2-533 DIMM with supported 4-4-4 speed bin timings should run at 533 MHz
with supported 4-4-4 speed bin timings. The DDR2-667 DIMM should downshift to
DDR2-533 timings, thus allowing the system to run at 533 MHz with supported 4-4-4
speed bin timings. The DDR2-667 DIMM will only downshift to
DDR2-533, if the timings for DDR2-533 are programmed in the DDR2-667 DIMMs SPD.
http://download.intel.com/design/chipsets/applnots/31320702.pdf
What does this mean ?
if 2 sticks of X will boot, and 2 sticks of Y will boot, but X and Y will not, put in each pair and find a utility that will read the SPD data. IF they do not share the same JEDEC timings (regardless of what the manuf specs/advertises ) in the SPD tables, you will probally have big problems (but see note at bottom). It also should apply to single sticks or any mismatch of memory in a P965 for that matter.
I imagine a creative bios programmer could get around this, but doubt anyone has taken the time (or bios memory space) to do it.
Sisoft Sandra can read SPDs, cpu-z can too but its buggy and doesnt show EPP all the time, and I doubt EPP counts but dont know for sure.
SPD is serial presence detect (it think) anywho, its a little chip on each memory stick that in addition of some other things, is programmed with the startup timing specifications for the memory stick so that the computer can figure out how to deal with it until the computer get far enough along in the POST/Boot process to be smart enough to figure things out for itself (use your bios settings) .
OK, you are desperate, you absolutely have no other way out, you dont mind if you mess up a stick(s) and it cant be returned, you have a lot of experience and you know what SPD chips are, and JEDEC standards. You might could try this utility, dont bitch at me if you fark up, I am saying it exists, I am not saying you should use it. For goodness sake read the whole thread, twice.
http://www.xtremesystems.org/forums/showthread.php?t=123624
For example, a DDR2-667 DIMM with supported 5-5-5 speed bin timings installed with
a DDR2-533 DIMM with supported 4-4-4 speed bin timings should run at 533 MHz
with supported 4-4-4 speed bin timings. The DDR2-667 DIMM should downshift to
DDR2-533 timings, thus allowing the system to run at 533 MHz with supported 4-4-4
speed bin timings. The DDR2-667 DIMM will only downshift to
DDR2-533, if the timings for DDR2-533 are programmed in the DDR2-667 DIMMs SPD.
http://download.intel.com/design/chipsets/applnots/31320702.pdf
What does this mean ?
if 2 sticks of X will boot, and 2 sticks of Y will boot, but X and Y will not, put in each pair and find a utility that will read the SPD data. IF they do not share the same JEDEC timings (regardless of what the manuf specs/advertises ) in the SPD tables, you will probally have big problems (but see note at bottom). It also should apply to single sticks or any mismatch of memory in a P965 for that matter.
I imagine a creative bios programmer could get around this, but doubt anyone has taken the time (or bios memory space) to do it.
Sisoft Sandra can read SPDs, cpu-z can too but its buggy and doesnt show EPP all the time, and I doubt EPP counts but dont know for sure.
SPD is serial presence detect (it think) anywho, its a little chip on each memory stick that in addition of some other things, is programmed with the startup timing specifications for the memory stick so that the computer can figure out how to deal with it until the computer get far enough along in the POST/Boot process to be smart enough to figure things out for itself (use your bios settings) .
OK, you are desperate, you absolutely have no other way out, you dont mind if you mess up a stick(s) and it cant be returned, you have a lot of experience and you know what SPD chips are, and JEDEC standards. You might could try this utility, dont bitch at me if you fark up, I am saying it exists, I am not saying you should use it. For goodness sake read the whole thread, twice.
http://www.xtremesystems.org/forums/showthread.php?t=123624