Anyone ever got a 100% OC on their ram?

TechnoCorruption

TechnoCorruption

TechnoCorruption

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Since the release of the E21xx series chips a 100% OC on cpu's has been well within reach for people not running extreme cooling and it made me wonder if it had ever been done on ram.

I am obviously only talking about 1MB Pi shots and I realise that it will more than likely never be done on 800 and 1066 ram as you would have to be hitting ddr rates of 1600 and 2132 respectively. The only ram I can see this happening on is 533 and 667.

Well I got a set of 2GB Crucial Ballistix 667 yesterday and after a good overclocking session I thought I would see if I could fulfil my curiosity :D I kept at 2.2v maximum as I am aware of the D9GMH failure rate at high voltage.

Well at 1.8v I got 1012MHz 5/5/5/15 memtest stable, I then had to raise to 2v to get 1140MHz 5/5/5/15 memtest stable. I got into windows and was able to run 1MB Pi at 1216MHz 5/5/5/15 with Crucials recommended voltage of 2.2v.

That was as far as I got at a maximum of 2.2v, I managed to boot the computer all the way upto 1310MHz 5/5/5/15 but it wouldn't get me into windows, I reckon 2.3-2.4v would get me a 100% OC of 1333MHz but I am not willing to risk those voltages.

So has anyone here ever managed a 100% OC? The more I think about it... maybe it could have happened on DDR ram, maybe a set of 133/166MHz doing 266/333MHz at loose timings?

 
OCing RAM is pointless except for memory bandwidth epenis... I've run super Pi 1Mb all the way from 800MHz to 1400MHz and theres little difference to the scores*, bit of a difference from 533 or 667MHz stuff but not enough to make it worth it... Performance in most games is unchanged and nothing in windows makes any noticeable difference that you can actually tell and even timing it the difference in in single digit percentages.

http://aten-hosted.com/images/spi3.jpg (highest I've got the RAM memtest stable on sensible voltages)

If you had some sticks of 533 or 667MHz stuff with D9GMH chips it would be perfectly possible to hit 100% OC with around 2.35-2.4 volts but it wouldn't last more than a few months - maybe a year at best even with active cooling (active cooling only makes any odds with most RAM at ~2.55+) unless you have modules that run very hot normally.

*might make some odds once you get above 4gig - but even with quads in most cases 800MHz RAM at stock is fast enough to feed them at 3.6+gig.
 
I am aware that overclocking ram brings very low performance increases but the question was one of curiosity rather than I had spent extra money to get a higher speed kit, hence why I only got the 667 ram instead of the 1066.

But overclocking for me is seeing what the most is you can get without introducing crazy volts to the hardware, whether or not there is much point to it or not is another matter :p Just checked out your screenshot... is that with the HZ in your sig? That's a very impressive clock.

Personally though I would never use 2.3-2.4v on DDR2 ram that didn't have a history of failing early so I definitely won't be doing it on these. I am happy that they do 1140MHz a 2v, that way they are clocked quite high and are at a somewhat safe voltage for long term use.
 
Thats with my old HZ kit (5-5-5-18 timings on 2.2v - 2.25-2.28actual) - it died after ~18 months running at those kinda clocks - the replacement set seems to have D9GCT rather than D9GMH - I've not really pushed it hard as I don't want to kill another lot of RAM but it seems to max out around 1150 or so - but it does do far tighter timings than my old HZ kit did.

I try to stick to 2.1v max now.

I did finally get that old HZ kit to boot into windows at 1400MHz after struggling to get above ~1330 for a long time - but no way was it memtest stable :P
 
I mate

I had my ballistyx PC2 5300( stock speed is 333mhz) at 640 mhz(1280mhz ddr2) 18-5-5-5 at 2.3V so it´s a 92% overclock over the rated speed

but the two kits I have (one is 2x512MB ,the other is 2x 1024MB) died in 2/3 months, each one:D
 
Rroff said:
I did finally get that old HZ kit to boot into windows at 1400MHz after struggling to get above ~1330 for a long time - but no way was it memtest stable :P
Click to expand...

1400MHz is amazing, shame those chips weren't on a 667 kit or that would be well over a 100% OC :D

I hear what your saying about not wanting to go over 2.1v now, I looking to keep under that myself as I really don't want these to fail.

It surprises me that companies advise such high voltages and then offer lifetime guarantee. I know they have to do it to match competition but the Kingston Hyper X for example are guaranteed up to 2.4v, they must know they will be replacing them at some point :p
 
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