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DDR Drive Strength

KennyT772

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I'm trying to get my tracers running 300mhz orthos stable and I'm curious what the drive strength option in the bios does. Anyone Know?
 

JC316

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Supposedly changes the input and output buffers or some crap like that, I messed with it on my Tforce 550 and never found any gains, or losses.
 

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Hey kenny...just confirmed with Athlon as well and we both think you should set the drive strength to 8
 
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I am almost certain that option in the DFI bios was to help with Booting and the dreaded COLD BUG ...like phase and the likes ...
 

regan1985

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i think your right, ive never changed it on my dfi board
 

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I know if its set @ 4 or lower 3rd party apps read it as weak strength.
 
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The only thing it may help with is booting if the PC is unable to boot to windows ...but again almost certain its in refrence to the COLD BUG...I leave that set to Auto.
 

sneekypeet

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I remember readin on the old DFI forum but I just added a post over to the new DFI forum and it reads>>>> exactly what would we use the DRAM Drive Strength for ????? whay run anything other than auto? I thought I read some where it was suppose to help with cold bug issues? <<<is that correct? Is there a guid line for the DRAM Drive Strength settings?Any help would be appreciated.
http://www.diy-street.com/forum/showthread.php?t=79364
hopefully an update will be had
 
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on my board, for high ram overclocks a low drive strength must be used, so possibly try a lower than default setting
 

sneekypeet

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I remember readin on the old DFI forum but I just added a post over to the new DFI forum and it reads>>>> exactly what would we use the DRAM Drive Strength for ????? whay run anything other than auto? I thought I read some where it was suppose to help with cold bug issues? <<<is that correct? Is there a guid line for the DRAM Drive Strength settings?Any help would be appreciated.
http://www.diy-street.com/forum/showthread.php?t=79364
hopefully an update will be had
good work...hopefully they get to you on this issue!!!!:respect:
 
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Drive strength is a sort of a vDIMM.
The "vDIMM" we all know is the operating voltage of the memory cells themselves located in the core of a RAM IC but vDIMM is not the only voltage influencing the RAM chip... Remember the structure of a DDR RAM IC... There's two clock frequencies inside the chip: one in the memory cells (½ of the rated I/O freq = 200MHz for DDR800, etc.) and one in the I/O buffers (400MHz for DDR800). Drive strength dictates the strength of the signal the memory controller uses to access (read/write) the I/O buffers.

It is speculated that the IMC on AMD Hammer arch CPUs goes haywire when the core is under extreme cooling such as phase or liquid nitrogen. Increasing the drive strengths can help to keep the mem ctrl stable...
To some extent.

It is worth a notice that different DIMM slots on a motherboard are usually factory configured to use diff. drive strengths to compensate interference/differences in DIMM signal trace routings. This means manually setting strong drive strength may result in dangerous signaling voltages, consequently damaging the RAM/MC.
 
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Very nice description largon! You the man;)
 

KennyT772

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From what it seems the drive strength is the carrier voltage, or the change in voltage for signaling 0's and 1's. All digital devices use a high/low current for carrying the signal, the higher the drive strength the large the difference in voltages between 0 state and 1 state. From the looks of things the A64 imc has an issue with interpreting the stock voltage differential at very low temps, so this setting allows for correction.

I'm still interested in what the various options actually set though.
 

regan1985

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just what i thought it was :)
 
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