How does it look?

im on air cooling so i dont think i will be able to get much over 1.3v :( is there any way of setting the cpu fan to run faster, or get it to kick in sooner?

You could unplug it from the (4-pin) CPU fan header and plug it into a 3-pin fan header elsewhere (probably also need to disable CPU fan alarm), that will likely make it run at full speed continuously. But really once it passes a certain threshold it should run at max anyway, so all you'd probably be doing is making it noisier when it doesn't need to be.
 
You need to stress the system. Just opening a few things and seeing that it can do it isnt good enough. I only consider an overclock stable after 8 hours continuous stress testing past. OCCT, IBT or Prime95.

Some people go for longer.

I disagree with the people who just run a game for a while and say its fine.

this is what i did, i ran 8-10hours of OCCT and was told this was not enough, which i then found out doing prime as it failed after about 4hours.
after tweaking it i have run OCCT for 30mins (i find it usually runs fine for the 8 hours if it manages 30mins but will do it overnight when i get chance to make sure) and its done 10 cycles of intelburn on maximum (around half hour) and that passed, going to do a quick prime blend and then if its still ok will continue to use it and then do some more tests overnight when i dont need it.
 
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But really once it passes a certain threshold it should run at max anyway, so all you'd probably be doing is making it noisier when it doesn't need to be.

but when at full speed does it not just stabalise the temp rather than decreasing it? therefore if i can get it to kick in at full speed @ 65deg rather than 75deg will it not therefore keep the temps around 63-68 rather than 73-78?
 
Ive never had something fail Prime that passses OCCT. Guess I was just lucky to get the solid overclock first time.
 
Ive never had something fail Prime that passses OCCT. Guess I was just lucky to get the solid overclock first time.

this is what threw me when i was told an OCCT test wasnt enough. i had things fail intelburn but passed OCCT on my old install of windows when it was @ 3.7GHz so assumed i had a corrupt intelburn, but looks like to make 100% sure its stable it needs to be tested with a variety of apps over a long period of time.
at the moment as im not doing anything too serious on my pc then im gunna take my time in testing it as i would rather use it for now as so far i have had no lockups, and as its now passed intelburn and OCCT then im pretty happy.
 
this is what i did, i ran 8-10hours of OCCT and was told this was not enough, which i then found out doing prime as it failed after about 4hours.

It does really depend on your stability needs, on how long you check stability for etc. For example, if you're only ever going to use internet and Word, then it simply doesn't have to be as stable as if you're folding or video encoding, because you'll never stress the CPU enough to be affected by the lack of stability. But equally, you might argue that there's no point overclocking to the point at which it's unstable because by definition that means you can't use the full speed of the CPU - you'd be better off having it a couple of hundred MHz lower and then not have to worry about something 'using too much processor' and crashing your computer.

But based on that, if I were overclocking a computer even though I only used it for very minor things, I'd probably be happy with 15mins Prime stable - unless I were using it for 'mission-critical' things - and if it did happen to crash on me, I'd just adjust the settings and perhaps stress-test it a bit more convincingly.

If on the other hand I'm using my computer for video encoding, so CPU is nearly continuously at max, I'd want to very thoroughly stress-test it, probably for 24 hours of Prime blend, small FFTs and large FFTs - stressing memory, CPU, and making sure temperatures stayed OK, because it'd be far more hassle to later discover encoding errors in the videos.

Then again, if I were using my computer for folding, I probably wouldn't bother stress-testing it with Prime for so long - a few hours, perhaps - and then iron out any few remaining stability issues if they arise during folding, until I no longer had any crashes or other errors.
 
but when at full speed does it not just stabalise the temp rather than decreasing it? therefore if i can get it to kick in at full speed @ 65deg rather than 75deg will it not therefore keep the temps around 63-68 rather than 73-78?

You can give it a try, but I doubt it. What's more likely to be happening IMO is that at, say, 65°C, the CPU fan hits full speed, but still can't cool the heatsink enough to keep the temperature at 65. As a result, temperatures continue to rise until the temperature gradient between the air being blown through the heatsink and the heatsink itself increases to the point where enough heat can be lost to keep the temperature from rising further.
If that makes sense.
 
i use it for gaming, putting home videos onto dvd, watching films and listening to music. so it does get used for a variety of things, all of which have worked flawlessly over the first few days of the 4GHz OC. which is why the prime failure was a bit of a shock.
its been doing a prime blend now for 20mins or so, will let it go for a bit longer and then will stop it until i can do an overnight test.
 
You can give it a try, but I doubt it. What's more likely to be happening IMO is that at, say, 65°C, the CPU fan hits full speed, but still can't cool the heatsink enough to keep the temperature at 65. As a result, temperatures continue to rise until the temperature gradient between the air being blown through the heatsink and the heatsink itself increases to the point where enough heat can be lost to keep the temperature from rising further.
If that makes sense.

hmm.......i see your point, will leave it then, dont think the mobo would be happy without the cpu fan being connected to it. i did notice there were a few settings in the bios for the fan, think one was to control it but the power amount and one for the voltage amount, but not 100% so left it on default.
 
some quick results

3dmark vantage physx enabled
3dmarkvantage40GHz1600MHz1800x10189.png


3dmark vantage physx disabled
3dmarkvantage40GHz1600MHz1800x10-1.png


intelburn 10 cycles maximum setting (about 30mins)
intelburn10cycles40GHz1600MHz1800x1.png


prime blend 30min test
primeblend30mins40GHz1600MHz1800x10.png


i know they are not conclusive, and like i said, will do some overnight tests over the next week.
 
Ten loops of ibt (with maximum memory used) is fairly conclusive as it's a particularly aggressive test. 30 minutes of prime by comparison doesn't mean as much. Intel burn test / linx is popular because it tends to show up instability quicker than prime does.

I think that's pretty good. What frequency is this at?
 
Seems reasonable. Gigabyte boards do seem to like odd multipliers. I'm still bewildered by you having more luck with 19x211 than with 21x191, the former really should be more difficult.

Since your board is clearly quite happy at 210 bsck, perhaps it's worth pushing for more than 4ghz on the x21 multiplier.

Most places online say odd multipliers are better, but as they're not for my board it stands to reason that it's worth trying x20 as well. Doesn't seem to have worked for you, but nevermind
 
I've no idea what you use your computer for, I'm reasoning that trying for 4ghz up from 3.7ghz implies you do something which benefits from this, and that same thing is likely to benefit from 4ghz up to 4.2.

If all you do is type and use firefox then you're entertaining yourself with no real goal in mind, which is also good, and also suggests going for 4.2 :)

Your call. I see very little difference between 4 and 4.4, but I'm going to try for 4.4 regardless.
 
i use it for gaming, putting home videos onto dvd, watching films and listening to music. so it does get used for a variety of things, all of which have worked flawlessly over the first few days of the 4GHz OC. which is why the prime failure was a bit of a shock.
its been doing a prime blend now for 20mins or so, will let it go for a bit longer and then will stop it until i can do an overnight test.

a bit of everything.
 
The thing is, nothing in that list will notice anything over 2ghz, so I conclude you're overclocking for entertainments sake

And so would probably like to try for higher :)
 
hi,

i did have my system at 4.2 gig 21x200 everything at auto apart from the dram voltage which i had to set at ram spec

unfortunately although it was perfectly stable 99.9% of the time i run models on my pc so need 100% stability and prime would only give me that at 4.0 gig on a 12 hour test

settings again 21x191 and again everything at default apart from the memory set at 1.65 volts as per ram spec for the 4gig clock

board is a gigabyte x58 ud7 memerory is patriot viper 1600
 
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