What does this mean in PRIME95?

[jonathanc]

Hi all,

I am very new to OCing so I hope that I could get some advice here

Recently managed to OC my E6600 to 3.2Ghz and everything looks stable (windows booted fine)

Temps at idle is 36-38 celcius. Vcore running @ 1.3v, RAM Multiplier x2.00, and +0.1V DDR2 volt. Ram timing @ 4-4-4-12 (x2 1 GB OCZ PC6400 800MHz)

When I start the torture test in PRIME95 it failed instantly >< Sometimes Core1 and sometimes Core2 fails.

The error has something to do with rounding errors. Anyone have any ideas why?

Windows etc seems to run fine though, even tried CoD4 for 1 hour without any crashing.

 

[jones377]

It means your overclock doesn't get the "Rock Stable!" certification

 

[Rike]

At those settings, your CPU is not completely stable. The rounding errors mean that the answer the CPU just calculated does not match an known answer; in other words your CPU was came up with a wrong answer.

Whether this is relevant to you is for you to decide. If your rig runs all your games fine and you don't care about the random crash from time to time, it OK. If you want to be fairly sure you won't have those type of problems, play with your settings until you are "Prime stable."

For myself, I don't general keep any OC running for long if it can't do at least 12 hours of Prime without error, 24 hours preferred. I cannot tolerate any instability in systems I use, but that's me.

 

[kalster]

i had my e6600 at 3.24 at stock vcore (atleast what my ip35-e think is stock). I had a similar issue where prime95 would error out in a few mins, i raised the vcore a notch (.020) and its prime stable now

 

[jonathanc]

thanks for all the replies <3

well I want my system to be fairly stable as well because I do some of my work on this rig and I don't want to loose the data or my boss won't be happy

Will try bumping up Vcore I guess until I get a stable Prime test.

I could run 3.2 GHz at stock as well but it crashes on Windows boot.

btw, is there a "magic" number for the FSB value? For ex. I am using 356x9 to get 3204Mhz... am I doing it wrong ?

Also does bumping up Vcore actually help with anything? I am keeping it as low as pos to keep my core temps low.

 

[kalster]

increased vcore helps with stability, i am using 360*9 (3240), there is no magic number, you need to find a good compromise of speed, stability and temperature

 

[jonathanc]

got mine up to 3.6Ghz (was 3.8 but windows insta crashed) loads into windows but its 50-51oC idle >< I have no idea if this is too high for idle temp?

 

[TC91]

50c idle is pretty warm, a bit too warm IMO, but if your load temps are 65c MAX then it should be fine. i ve had my e6600 @ 3.6ghz, ran it @ 3.6 for ~6 months but that needed 1.5125v in bios, 1.46 actual under load, 1.48 actual on idle, which i later deemed was not worth the extra 200mhz from 3.4ghz, and it was a bit too warm for me too, peaked at 67c on both cores on prime 95 dual small fft's, so i decided to keep things safe and go for a more modest oc since i dont really want to spend money on another cpu anytime soon. 3.4ghz peaks at 57c on dual prime 95 fft's, idles at 32-34c which i think is a very good compromise. you may have to bump some motherboard voltages as well to stay stable.

 

[SinxarKnights]

Originally posted by: jonathanc
thanks for all the replies <3

well I want my system to be fairly stable as well because I do some of my work on this rig and I don't want to loose the data or my boss won't be happy

Will try bumping up Vcore I guess until I get a stable Prime test.

I could run 3.2 GHz at stock as well but it crashes on Windows boot.

btw, is there a "magic" number for the FSB value? For ex. I am using 356x9 to get 3204Mhz... am I doing it wrong ?

Also does bumping up Vcore actually help with anything? I am keeping it as low as pos to keep my core temps low.

LoL! Now, now, you know better than to OC a work computer. Anyway, upping your voltage will sometimes help with the OC. I found that if its not prime stable, but don't crash during normal use, you will run into some issues. I am a gamer and I love to play Oblivion. A 'small' issue with this is that the AI will glitch everytime I play with a unstable OC. Another example is the windows calc. with it unstable, sometimes it comes up with the wrong answer.

So I would either try increasing the core voltage or backing off a little. But since you said you do some of your real life work on it, I would be VERY careful with any OC on it.

 

[DSF]

I see that you're giving your RAM +0.1V, but sometimes OCZ RAM likes to have even a little bit more than that. Do you know the exact specs of your RAM? OCZ has more than one 2x1GB DDR2-800 kit.

 

[Burrich]

Originally posted by: DSF
I see that you're giving your RAM +0.1V, but sometimes OCZ RAM likes to have even a little bit more than that. Do you know the exact specs of your RAM? OCZ has more than one 2x1GB DDR2-800 kit.

Aye, most OCZ RAM is able to do 2.1 - 2.2V (which would be +.3 at least). To me, if Prime fails, it means that you have an unstable OC. The reason for such is that it could lead to data corruption if you were to crash while doing things. Nothing like typing a paper or doing your taxes and having your system reboot and losing everything.

 

[Mondoman]

Originally posted by: Burrich
...Nothing like typing a paper or doing your taxes and having your system reboot and losing everything.

Or worse, not rebooting, but just calculating the wrong answer!

 

[jonathanc]

Originally posted by: DSF
I see that you're giving your RAM +0.1V, but sometimes OCZ RAM likes to have even a little bit more than that. Do you know the exact specs of your RAM? OCZ has more than one 2x1GB DDR2-800 kit.

er mine is the one with 4-4-4-15 timings.. or this one : http://www.overclockers.co.uk/...t.php?prodid=MY-072-OC

I know have these settings :

FSB clock : 245 x 9 : 3.20Ghz
Ram multiplier : x2
PCI freq : 100
Timings : 4-4-4-12
DDR2 volt : +0.1V
Vcore volt : 1.4000v (I am hoping to get it lower tbh)

PRIME95 : stable for ~5 hours max temp 60oC, average temp @ 100% CPU load 55oC
idle temp: 38-41oC

Next target (if I have time) : Run it stable @3.4Ghz OR lowering the Vcore to around 1.3500V stable.

my CPU cooling is not that good , its a Coolermaster Aquagate Mini R120, thinking of changing but holding back till the new 45nm cpus are out so I can upgrade the rest as well