Ideal voltage for DDR Ram?

[russr]

What is the ideal voltage for DDR Ram clocked over 150mhz fsb? I'm using an Epox 8k7a

 

[AndyHui]

The nominal default voltage for DDR SDRAM is 2.5 volts.

However, these days this number seems to be the minimum for proper operation. In many cases you need to go to 2.6 volts to be stable at ANY overclocked speed for generic PC2100 DDR SDRAM. Brand name DDR SDRAM doesn't always need a power boost.

If you have PC2400 or PC2700 rated DDR SDRAM, they shouldn't need too much of a boost in order to run at 150+MHz FSBs, since they are tested to operate at these speeds. For peace of mind, I would still recommend going to 2.6 volts.

2.9 volts would be the absolute ceiling on DDR SDRAM voltage, no matter what the PCxxx rating.

 

[russr]

So on the Epox 8k7a, any idea what the default setting is and which jumper I should set it too? Will I damage it by setting to like 2.6 or 2.7?

 

[AndyHui]

As I said above, 2.9 volts would be the maximum voltage I would set. Therefore, 2.6 volts or 2.7 volts would be fine. There will be no damage.

 

[russr]

I'm now at 158mhz for the fsb and I find that around this and 157 mhz, I will often freeze at the bios screen. However once I get past that, prime95 and 3dmark2k1 will run for hours together.

 

[Jen]

i have had my ddr memory at 2.9 volts for the last 8 months without any problems. the memory is Pc2400 crucial seems to be holding up so far. also have a epox 8k7a and am only running 139 bus at the moment



Jen

 

[ortie]

I have my 2400 DDR at 3.0, but I have a TT Ram cooler on mine. I've had no problems with this set up and have been it like this for about 2 months now. My fsb is at 165*10 with my cheese XP 1500+. But like it was said, I wouldn't dare go above 2.9 unless you have some kinda cooling in place for the ram.

 

[nealh]

Jen ..why not decrease the voltage down ..seems like you should be able to run a 139 fsb with lower voltage??!!!

 

[nealh]

Wow ortie very nice overclock on the 1500+...320 mhz...
I remember not too long ago with the piii700 if it was not o/c to 933 it was dud.....now we seem to be happy with 100-200 mhz...10-15%....
My piii700@945..was $195 1.5 yrs ago from onvia...35% o/c at default 1.65v....many were getting 40%+

 

[Jen]

<< Jen ..why not decrease the voltage down ..seems like you should be able to run a 139 fsb with lower voltage??!!! >>



i sort of forgot i had it up that far.......i set it there 8 months ago to go for super high bus. as it was i messed up with timings and corrupted the registry. so since then i havent tried playing with it again. i should set it down some since i havent tried to go high bus

i got some new red pcb pc2400 it says...........7ns on the chips it also says.........NANYA is the chip. i want to see how high this stuff will take me



Jen

 

[nealh]

funny how we are always going for me speed despite the pitfalls...corrupted the registry but now new ram and time see how far we go....
I am no better I went to Athlon XP and KR7A-RAID DDR setup to hit a 150 fsb....well I got but it lead to a hateful relationship between the mobo and my liteon cdrw..so the liteon 24102B is gone and now extra $$ for a plex 2410....UGH....needless to say the system is more stable but I see little speed differences..If and when my wife finds out I am screwed....again...

 

[Jen]

<< funny how we are always going for me speed despite the pitfalls...corrupted the registry but now new ram and time see how far we go....
I am no better I went to Athlon XP and KR7A-RAID DDR setup to hit a 150 fsb....well I got but it lead to a hateful relationship between the mobo and my liteon cdrw..so the liteon 24102B is gone and now extra $$ for a plex 2410....UGH....needless to say the system is more stable but I see little speed differences..If and when my wife finds out I am screwed....again... >>



should see me over here.........i just got a 1800 + xp to play with like i needed it. then this red pcb memory and a 73 GB seagate cheetah cause i am tired of IDE drives..........all scsi now.......


no more upgrades i keep screaming


Jen

 

[MoFunk]

Sorry guys I am at work and dont have my manual and the Epox site is still flaky for me. What is the default ram voltage on the 8k7a? I moved my jumper from the default to 2 over and wondering what that voltage gives me. Thanks.

 

[Jen]

2.5 volts is stock........move two jumpers you get 2.7.........correct me if i am wrong



Jen

 

[todays]

I have two sticks of 256mb Crucial CAS2.5 DDR 2100 in an Epox 8K7A with the bus at 155 Mhz stock voltage 2.5v (default)

 

[MoFunk]

Got home and saw 2.5 volts in the manual. I never had any issue with stock volts before until I put in that ECC ram. I got blue screen after blue screen. Opened my case and I was at 2.6. Moved to 2.7 and the problem is solved! i wonder if ECC ram needs a touch more juice. Hmm.....