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Samsung 2x4Gb Low Voltage DDR3 1600 kit (OCing to 2400+) Discussion - Page 161

post #1601 of 2062
I'm pretty happy with my dims as well! I paid $40 bucks including shipping and have these speeds at such low voltage (1.375)!



I was able to go 2133 but had to push volts higher, I'm happy where I'm at voltage wise and speed wise! thumb.gif

I haven't messed with the timings yet to maximize the dims and I'm currently at 2000 11-11-11-28-1T, I don't feel like messing with it yet, but I eventually will someday! biggrin.gif
Edited by mark_thaddeus - 1/3/13 at 9:46am
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post #1602 of 2062
What trc is everone here running? I'm currently on 9-10-10-24-45 1T but I was wondering if it's possible to get that trc down to 40 or 41 without too much trouble.
post #1603 of 2062
Quote:
Originally Posted by wolvers View Post

What trc is everone here running? I'm currently on 9-10-10-24-45 1T but I was wondering if it's possible to get that trc down to 40 or 41 without too much trouble.

Would largely depend on what speed and voltage you running.

Tightest I can run is 62 with speeds over 2400mhz..an 1.76v
post #1604 of 2062
Quote:
Originally Posted by larymoencurly View Post

The reference voltage is Vss, which for practical purposes is 0V, and apparently digital chips will last years even at absolute max voltage (why else would there be those lifetime warranted DDR3 modules rated 2.0V or even 2.1V?).
If Vss is 0, why that -0.4V? (-0.4 V ~ 1.975 V)
Quote:
Originally Posted by larymoencurly View Post

The chips are more vulnerable than anything else on the modules, and there's nothing on the modules that will be damaged at 1.60V. So the fact the OC at 1.5X failed after a try at 1.60V had to be due to something else, like a change in the BIOS settings or variation in timing or voltage caused by temperature.
Does the PCB feature the same components as g.skill sticks? I mean resistors and other things that might affect voltage supply to the chips.
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post #1605 of 2062
Quote:
Originally Posted by cloppy007 View Post

If Vss is 0, why that -0.4V? (-0.4 V ~ 1.975 V)
Does the PCB feature the same components as g.skill sticks? I mean resistors and other things that might affect voltage supply to the chips.
Isn't that the limits for Vdd, from -0.4V to 1.975V? I'm guessing the protective diodes in the chips turn on and short when Vdd goes 0.4V under Vss.

I'd be really surprised if the G.Skill and Samsung circuit boards were substantially different, and both have to contain capacitors to filter the power voltages and resistors to clean up the signals.
post #1606 of 2062
1.975v is not even remotely a sustained maximum. Absolute maximum ratings are almost always the limit for transient spikes, stuff lasting no more than milliseconds at a time.

That's not to say that some ICs can't take very high voltages, even for long durations, but using an absolute maximum rating as an indicator of what it's safe to actually set is completely misunderstanding what rating is about.
Quote:
Originally Posted by larymoencurly View Post

and apparently digital chips will last years even at absolute max voltage (why else would there be those lifetime warranted DDR3 modules rated 2.0V or even 2.1V?).

This is a rare exception, not a general trend.

Not all DDR3 ICs are the same, and pushing 1.975v through 30nm DDR3 is usually going to result in dead DDR3 fairly quickly.

I've had 50nm ICs that could be reliably degraded to failure in under 6 months of heavy use with 1.7-1.75v and I haven't seen anyone rate any DDR3 DIMMs at over 2.0v since 60nm ICs were common. Even then, they were binned parts, and carried such a price premium that a 50% failure rate would still have been profitable.
Edited by Blameless - 1/4/13 at 4:50am
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post #1607 of 2062
Quote:
Originally Posted by Blameless View Post

1.975v is not even remotely a sustained maximum. Absolute maximum ratings are almost always the limit for transient spikes, stuff lasting no more than milliseconds at a time.
That's not to say that some ICs can't take very high voltages, even for long durations, but using an absolute maximum rating as an indicator of what it's safe to actually set is completely misunderstanding what rating is about.
This is a rare exception, not a general trend.
Not all DDR3 ICs are the same, and pushing 1.975v through 30nm DDR3 is usually going to result in dead DDR3 fairly quickly.
I've had 50nm ICs that could be reliably degraded to failure in under 6 months of heavy use with 1.7-1.75v and I haven't seen anyone rate any DDR3 DIMMs at over 2.0v since 60nm ICs were common. Even then, they were binned parts, and carried such a price premium that a 50% failure rate would still have been profitable.
Interesting, thanks for sharing your experience.
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post #1608 of 2062
Several engineers said the duration of exposure to absolute maximum voltage is usually not specified for chips, however one engineer said his company's automatic testing equipment applied that voltage for only one second. At least the time limit is much longer than a transient spike. I don't understand overclockers who dare push such limits, and I don't understand why my BioStar motherboard allows exceeding it by a chip-frying 0.5V.
post #1609 of 2062
One second sounds like the kind of proofing one would do to ensure it would survive transient spikes.

Anyway, there are plenty of OCers who are willing to sacrifice hardware in the pursuit of record attempts, or just to see what things are really capable of. Many OC oriented motherboards allow for extreme voltages because not all components are the same, and because some people may well be able to utilize them, perhaps on equally extreme cooling.

Options are good, even if they aren't always practical.
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post #1610 of 2062
Just a quick question here Since I have this RAM.

I didn't think something so simple would require another " will this work thread? ".

I have the opportunity to get a good deal on a 3570K. If I put this CPU into my z68 board, will I have the option for higher memory multipliers?
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