Can anyone prove an 8hr Orthos Screenie of 4.5ghz on air with a retail E8400?

[jaredpace]

edit: does anyone have a 4.2,4.3, or 4.4 Screen shot of 8hrs prime on air?

a lot of people doubt this and say that even though the e8400 will do suicide benches at 5 or 6ghz, that it is only capable of approx 4.2ghz prime stability.

can anyone disprove this with a screenshot of occt orthos prime etc with an 8 hour duration with a cpu speed of 4500mhz on air. I'm in a heated arguement via private messages that this is possible, yet can't find any proof.

I'm convinced i could do it on my system (e8400/ultra 120), but my supertalent pc2-6400 800mhz ram wont OC over 890mhz and stay prime stable ( i dont really know how to relax the timings correctly)

the best i can prime stable at is around 4190mhz but, i think i could do better with some good Pc2-8500 ram

anyone wanna help me out with that screenshot?

[JAG87]

seriously dude give up already. how many people have to tell you that you wont see 45nm do 4.5 ghz prime stable? its not going to happen, not right now at least. maybe with another core revision, like G0 did to B3 but not with C0.

And even if you do by fluke find a chip thats stable at 4.5 ghz, remember that 45nm are not meant to take more than 1.45v, anyone using more than that to achieve 4.5 ghz prime stability will lose their chip eventually.

1.45v at 45nm is the equivalent of 1.55v at 65nm, and thats the borderline between safe and seriously wearing your cpu out. Stop drool-dreaming of 4.5 ghz prime stable. It ain't happening if you want your chip to last until nehalem at least...

[[XC] riptide]

jaredpace. Welcome. This sub forum is restricted to Accomplishments of 'Xtreme Overclocking'.

Mods. Please move.

[SoF]

yeah definitly belongs to intel section, anyway it is quite a task 4.5 ghz air on 8400...4ghz is normal, 4.1 is good, 4.2 is very good, 4.3 VERY VERY good....everything above is just exceptional and a very good chip.

[jaredpace]

Thanks for moving it!

[aoch88]

Honestly, I'm just as curious on this. Getting it doing Super PI doesn't mean anything except for good numbers. We're spending this much of cash to get a Super PI screenie 9 secs but not getting to enjoy the speed?

4.5Ghz Orthos stable for 2 hours is good enough to prove something. I wouldn't have spend on this chip if I knew it doesn't do stable at 4.3Ghz (at least) with a reasonable voltage.

The reviews are terribly misleading at the first place.

[tet5uo]

well, so far I can get my qx9650 to complete spi runs at 4.5 gHz, but as far as 8 hours of prime, that's been a max of 4125 so far....

You can run a super-pi at almost suicide clocks nowadays...

[aoch88]

Yes, that's the problem. Everyone's posting a Super PI screenshot and what if it does Super PI @ 8Ghz?! It's just a number and screenie, nothing else.

I guess we should be more practical and see what's a stable OC that we can use daily thus able to enjoy that kind of Mhz and speed

[jaredpace]

heheh, Yeah well i really haven't seen any prime or orthos runs of 8 hours on anything higher than ~4.2 or 4.3

[Funky]

Well honestly noone will be taking this chance. Temps are already so high on 4.2 and 4.3 ghz that i cant even thing of 24x7 setup for anything higher.
I am running 4274Mhz 24x7 on air and already i am touching 70C while priming.
When i tried to run prime at 4.5Ghz temps went beyond 75 in no time at all and i manually stopped it.
If you are funding for a chip then i will do 4.5Ghz prime a shot :P

[Bail_w]

so far i passed Dual Super PI 32MB @ 4.5ghz with 1.45v, 3dmark06 and 05, but everytime i run orthos or prime95 it will crash instantly, i am still trying to find out what causing the problem.

[Dumo]

With subzero it can be done.

On air you just torture your cpu unneccessarily

[Kunaak]

I did a few hours of prime 95 at 4.5 (9 x 500) with 1.5 volts.
but honestly, I was not confident about using 1.5 daily, so I backed down alot.

4.06 at 1.34 volts.

[turtletrax]

4320Mhz 1 hour + Prime.



I can get around 4.42 Ghz fairly stable but past that is a no-go. I was all gung ho for 4.6+ Ghz with the voltage ramp I was seeing but nothing I can do will get me there. Gonna try on the P5K P next week but I would say that if the DFI cant do it, no P35 can.

[aoch88]

Well honestly noone will be taking this chance. Temps are already so high on 4.2 and 4.3 ghz that i cant even thing of 24x7 setup for anything higher.
I am running 4274Mhz 24x7 on air and already i am touching 70C while priming.
When i tried to run prime at 4.5Ghz temps went beyond 75 in no time at all and i manually stopped it.
If you are funding for a chip then i will do 4.5Ghz prime a shot :P

It's a known issue and the temps shown are incorrect. Some people changed from air to water and the temps report the same. It's not running that hot and we just have to wait until the mobo manufacturers or core temp comes up with a fix.

[aoch88]

I did a few hours of prime 95 at 4.5 (9 x 500) with 1.5 volts.
but honestly, I was not confident about using 1.5 daily, so I backed down alot.

4.06 at 1.34 volts.

I need about 1.4volts actual to be stable at 4.1x Ghz. I guess the fun is all about Super PI screenshot at sky high Ghz

The E8400 isn't that overclockable after all - it's so hard to get it stable pass 4Ghz. I think 4.2-4.3 is the best we can do with normal acceptable cooling (air/water).

[kiwi]

Lol, 4.5GHz Prime/orthos is possible on good air and something like 1.5-1.6V. It just might be too much for 45nm 24/7, nobody knows yet

[I34z1k]

I'm happy with 2 hours of dual orthos on my chips. Can't wait for my e8400 though.

[dissident]

thanks for starting this thread, op. It's much more useful then to look at a thread full of people running 4.5+ with superpi runs.. it's one of the more annoying things about this forum.. who cares about suicide shots.. prime stable clocks are really all that matters.. and to that end, I think I'm going to keep my q6600 which is prime stable at 3.6.. not worth it to upgrade to a chip with less cores when it's only going to net 500 mhz plus a minor improvement of 5% because of cache, SSE, etc...

by the time I would notice any bottleneck making the switch applications will be using the 4 cores anyways.

[jaredpace]

well i tried for myself, since i'm very annoyed by q6600 owners telling me how great their chips are and recommending them to people over e8400's when they come asking for the best cpu for gaming when overclocking....

i did 4500mhz on air, but prime doesnt last longer than 1hour 20 mins and usually crashes between 1 min and 15 mins

pics
http://picasaweb.google.com/jaredpace/45ghzPrimingOnAir

[Yoxxy]

All you did was SETFSB from a lower speed.

You need to set the speed originally to be actually stable at that speed.

Good try though.

Why would you say it is stable at 1 hour 20 minutes when your longest screenshot is 8 minutes.

[kitfit1]

seriously dude give up already. how many people have to tell you that you wont see 45nm do 4.5 ghz prime stable? its not going to happen, not right now at least. maybe with another core revision, like G0 did to B3 but not with C0.

And even if you do by fluke find a chip thats stable at 4.5 ghz, remember that 45nm are not meant to take more than 1.45v, anyone using more than that to achieve 4.5 ghz prime stability will lose their chip eventually.

1.45v at 45nm is the equivalent of 1.55v at 65nm, and thats the borderline between safe and seriously wearing your cpu out. Stop drool-dreaming of 4.5 ghz prime stable. It ain't happening if you want your chip to last until nehalem at least...

Some peeps really are full of crap Never mind when half term is over you can go back to Primary school.

Anyway, not an 8400, but it is stable. Orthosing at 4.7ghz now.

[JAG87]

Some peeps really are full of crap Never mind when half term is over you can go back to Primary school.

Anyway, not an 8400, but it is stable. Orthosing at 4.7ghz now.

thats wonderful, hence why I said that you might find one in a thousand cpus that is capable. it was just to cover my as$ in case someone like you running stupid voltages came along. 1.488v after vdroop equals >>1.5v idle. Intel says 1.45v max in their white paper.

stable but not safe

[Yoxxy]

He is on phase as well

Original post was regarding air, not Mach2 GT/Chilly1 Evap/Desuperheater (ala modded phase change).

[kitfit1]

thats wonderful, hence why I said that you might find one in a thousand cpus that is capable. it was just to cover my as$ in case someone like you running stupid voltages came along. 1.488v after vdroop equals >>1.5v idle. Intel says 1.45v max in their white paper.

stable but not safe

You did look at my sig, did'nt you ? Running phase, i have only just started this clock. As it happens my mobo has NO vdroop (not untill about 1.6v anyway). My vcore is as in the screenie, 1.488v.