New World Record? :ROTF: Where have you been? 6.3 is the World Record. Remember Team Finland & AMD? Theres videos out with them hitting 6.3Ghz.Quote:
Originally Posted by ajaidev
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New World Record? :ROTF: Where have you been? 6.3 is the World Record. Remember Team Finland & AMD? Theres videos out with them hitting 6.3Ghz.Quote:
Originally Posted by ajaidev
Notice the motherboard used again.
Might be our new champ.
Its a new world record allrite the mb used is a 790FX not a 790GX.. :yepp:Quote:
Originally Posted by Throwed
Does it exist a WR for each chipset?:p:Quote:
Originally Posted by ajaidev
However, IMO it should exist a decent picture (or a reasonably steady video recording) of the cpuz tab, or a validation, if it's supposed to be called a WR. If that kind of stuff exist for the 6.3ghz-session, then allright.
I think a new world record for PHII overclocking will be set CES 2009 when AMD will attempt to use Liquid Helium (-269°C) to cool down the Phenom II and clock beyond that 6.3Ghz mark (Source MADSHRIMPS Phenom scaling article).:)
I expect PHII to hit 7ghz at ces09 (Hopefully) :D.
SaaaWeeet!Quote:
Originally Posted by Blaber
I have been involved in high end tube audio design for over 25 years. Many component effects were verified by blind testing when no one had any technical justification. Selection of components with specific characteristics can make an obvious difference, but the science to explain those differences is sometimes hard to find. Audio cabling is one area where some work has been done - copper stranded wire develops surface oxides which can have diode effects, which cause nonlinear transmission. Creating speaker cables from wire wrap (which are silver coated and gas tight) virtually eliminates those effects. You will see cables made with multiple gauge wire, transmission line designs, and other exotic stuff, each with advocates and some science. This is mostly art, but hand-selected parts put together with rules that are part witchcraft can still produce results that are clearly superior, even if the makers don't know exactly why.Quote:
Originally Posted by accord99
In multisocket servers, AMD has shown superior performance in virtualization, many database applications and in some web serving, even though Intel wins on benchmarks. Look at the differences in Nehalem versus previous Intel hardware - Intel did not reduce the L2 cache by a factor of 10, or add on-die memory control, just for fun. They did it to be more competitive.
If a majority of large sample of users feel that some combination of AMD components produce a 'smoother' gaming experience, there are probably technical reasons for that. It is probably also dependent on the game engine and a ton of other parameters that are not well controlled, because users don't know what to control. A group of disciplined (and unbiased) amateurs could probably get to a better understanding of why that is true, but it would take a good sample of different systems, and some thought about what to test. This kind of forum could be a place to do that, if the testing group gets away from thinking they know the answer, and just follows the data.
would be nice to test it, we made another thread for it too. if we can find some unbiased testers and find a good testing method it would be nice but at this point we can't think of a good testing method and no matter what people come up with intel users will say that it is biased and won't work. so it would be nice to find some unbiased people willing to give it a test.
duplicated for some reason - original is above
I recall seeing 1800HT and usually something like 800-1200 HT when going for 4ghz but just Figured i'd share my 4ghz cpuz anyway since i just got around to verifying
Theres been some with up to 2667 nb / hypertransport with 3.8 to 4.2 core clock.
I think just not everyone's willing to test the limits of the chip since they don't wanna risk any issues.
well on NB i've hit 2742 i think, HT is just limited by NB speed, but if using cold on the chips or going for uber high clocks you have to set HT to 1ghz, hench the records being at 800-1200 HT speed.
:rolleyes: except for the fact that liquid helium sucks at removing heat and such a cooling system will be way too sophisticated.Quote:
Originally Posted by Blaber
but above all, beyond the -200 °C mark most electronics will fail to function the way they should. you need to stay above a certain temperature threshold.
While liquid helium cooling is not for amateurs, it is possible to make large capacity coolers. The usual technique is to use a sealed system where the helium is always in a liquid state. LN2 is sometimes used in a dual dewar setup to reduce heat loss from the inner dewar. LN2 may also be used in the cooling stage.Quote:
Originally Posted by biohead
This works like any refrigeration system - the closed loop system would need to provide adequate flow to cool 150W or so.
Both electron and hole mobility in silicon actually increase with decreasing temperature down to very low levels - both go up by a factor of 10 between 300K and 70K. This appears to be linear - there is no 'wall' at -200C, and it is just a question of where things get sufficiently far away from design parameters to quit working. I would assume that a part that works well at -190C would work at lower temperatures, and only experimentation would show where the degradation becomes significant. Silicon is not a superconductor at any temperature, with any doping levels used in semiconductor design.
And there is a fair amount of work on large scale liquid helium cooling at the University of Texas at Austin, so it seems possible that this could be a workable stunt.
references:
Centre national de la recherche scientifique
http://cat.inist.fr/?aModele=afficheN&cpsidt=1809679
Forced flow cooling at liquid helium temperature
Résumé / Abstract
Single phase helium at supercritical pressure is often used as refrigerant for super conducting components. At forced flow conditions it enables high heat transfer rates and it prevents the difficult conditions of a two phase flow. The advantageous flow conditions are paid with a considerably reduced capacity of the refrigerant since only the sensitive heat and not the evaporation heat is used.
Electrical Properties of Silicon - mobility versus temperature for different doping levels
http://www.ioffe.rssi.ru/SVA/NSM/Sem.../electric.html
CERN 1.4KG/S helium cryopump
http://www.barber-nichols.com/pdf/at..._pump_test.pdf
http://valid.canardpc.com/records.php
Just have to smile at those 5.5ghz core I7 records there when the 6.3 phenom IIs are there in view.
yea but they aren't day to day clocks. it doesn't seem like i7 gets that great of a bonus from extreme cooling. once deneb comes out and we see what the average oc is that will decide it. not just the maximum overclock. only 4 more days.Quote:
Originally Posted by iocedmyself
well of course they aren't day to day clocks which is kind of my point, the glass cieling for i7 is 800mhz below phenom II (thus far anyway) I7 has trouble hitting anything past 3.6 on air as has been shown by several reviews, at least one posted in this thread. While Deneb routinely seems to hit 3.9-4.1 on air, someone here had hit 5.6 or 5.7 with cold which isn't far off from record.
Though i think it has less to do with i7's not benifiting much from cold and more to do with they run so hot to begin with that there isn't much headroom
So keep meaning to repost that, memory running at 570 (1140) 5-5-5-5-18 ganged, also running a single thread at 3.8 scaled almost liniarly taking 39.922 compared to 4 threads at 10.25
4ghz is possible with air on Ci7 with HT off, just look in the Ci7 ocing thread. The only problem are temps with HT on and they depend strongly on voltges.Quote:
Originally Posted by iocedmyself
It make a huge difference if HT is enabled or disabled, disabling HT reduces temps for ~10-15°C
3.8ghz is no problem on air for most Ci7 with HT on and a good aircooler such as a TRUE or a Noctua U12P. Everything above is still possible but temps get in the critical range 90°C+ so WC is recommended or disable HT. :yepp:
Thanks for the HT tip i had no idea. We are right now on 3.6 Ghz with ULTRA 120 and the temp is stable at low 80's. We had tried to give it a boost at 4ghz and it went BSOD on us. :DQuote:
Originally Posted by Hornet331
We did try 3.8ghz for about a week but the temps were really really high and there is always a risk that the summer sun would kill this perfect clock once summer comes around due to rise in Ambiance temp. Now i will try it again with HT off and report back.
Yeah HT is a real power hog. :D
But imho its worth it, i can get done ~33% more WUs at the same clock. And i know you feeling about temps, i also stoped at 3,6ghz with ~70°C (23°C ambient) cause in summer temps will raise for sure (33°C ambient still should stay around 80°C )
Sry for off-topic guys, just wanted to say that.
i7's limit is heat 3.6 is the stopping point essentially to keep the heat down, obviously if they both played to the tune of supernova heat 90*c+ then obviously we'd be able to push more out of the phenom II aswell.
But keeping the same heat envelope of ~ 60*c the i7 can reach 3.6 and deneb well we don't know yeat really but I'm gonna guess 4.0-4.2.
It's so off-topic, but I cannot resist to answer.Quote:
Originally Posted by ajaidev
The whole point/advantage with Nehalem is HT!!!
Turning this off means a "fat Yorkie" (regarding die size). Huge price for same performance!
I would *never* consider this chip if it wasn't for HT and the corresponding *huge* increase in multitasking use/benches.
The "high" temps is no issue in daily use (mostly idle) and for gaming(not using multi-cores/HT).
http://enthusiast.hardocp.com/articl...50aHVzaWFzdA==
I'm sure that's been seen by most here but still will link it (possibly again)
and right after i started writing this hornet kinda made my point for me with the 70c load in 23c ambient. Really not trying to start a flame war here, but lets be honest...hyper threading...cpu temps you can fry an egg on, this sound like oh i dunno...maybe the p4 reincarnite? :p:
4ghz on air may be possible..on some chips in cool ambient temps but by no means is the norm i would think. Aside from that it's basically saying, "i7 bring back hyperthreading with clock speeds of 4ghz with air cooling! (so long as hyperthreading is disabled in most cases unless you dont mind your computer doubling as a space heater) Really, come on.
I'm not knocking the performance i'm just being objective here. I'm in a 24c ambient with Deneb clocked at 4.1 @ 1.55v atm as i'm working on XP clocks and it idles at 29-31c load temps haven't peeked above 43c running prime torture test. USing a duOrb cooler. So I7 getting a 10-15c drop down from 90c still equates to....dissapointingly hot IMHO.
At any rate to each his own. As many have pointed out phenom II's are a half step on the way to 6 core chips, and even at $300 for an early purchase of a 3ghz 940 PII chip that would hit 4ghz on air and needing nothing else for an upgrade i think will be more appealing.
60c for Denebs maybe if you have it heavily overvolted or box cooler under long and heavy loads, but really don't think so in many real world scenarios. I had the same cooler on my 9850 BE phenom and that idled usually at 45c with loads creeping up past 60c, in the same room, same case same ambient temps even at stock speeds. Many many times did that cut out to a BSOD from overheating when it would go past 65c. And i know full well how to properly apply a heatsink and AS5 if it's crossing anyones mind to question that. :p: I've seen this chip go up to 51-52c when ambient has been raised and i had voltage at....less then safe levels ;) Keeping in mind i have an ES chip, retail chips will have been tweaked and cleaned up a bit more so there is possibility that off the shelf chips will be able to get pushed further, and i should have a couple to play around with sometime soon, am trying to convince someone to let me fiddle with their 920 retail chip.
That's a wrong summation; Ci7 can take heat more than Deneb, it's by design. Your Deneb won't overclock a damn if your core voltages reach anywhere near Ci7. As you guys would find out soon enough: Deneb needs to be kept cold in order to reach the 3.6, 3.8 Ghz range. A 60C t5emp may be the limit for Deneb, but it's certainly not the case for Ci7.Quote:
Originally Posted by Caveman787
Zucker....
As always the AMD downer pill....
I would think most people wouldn't want to run their processor's 70*c+. Why because theey're likely to run into heat build up problem's and possible overheating of other component's.
Or as the case of some out there frying alive in thier houses :rofl:
Sound like fun to you? then enjoy!
The fact is still that keeping either within sensible temps deneb will clock a few mhz higher and that's just on air.