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Beginner help with OCing

917 Views 15 Replies 4 Participants Last post by  The Duke
AS the title says: I have read quite a bit about it and finally went to my BIOS to see what kinda options i have, to my suprise there was an AI OVERCLOCK option which can be set to 3%,5%,8%,10%. So i set this to 3% and ran Prime95 with no errors for more than 2hrs. My CPU temp as recorded by Everest/PC ProbeII showed max of 50degress Celcius, while the prime95 test were being run, it avg'd at 47. Now 3% is not any noticeable difference, so would it be safe to go to the 5%,8% option? Is this AI Overclocking option reliable/safe? It seems like the perfect thing for a beginner am i right?

Asus M3N78 PRO, bios version 0603
Phenom X4 9650 @ 2.3ghz
ThermalTake Big Typhoon VX
2x120mm case fans
8GB Corsair @ 800mhz
Ultra 750w psu
9800GTX+, Black Edition
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Welcome to overclocking! It is supposed to be fun, so enjoy it.

In my opinion, 3% more speed will not be noticeable at all, and higher numbers in auto mode may stress your computer too much in terms of voltage.

I would say that it is better to spend a few hundred hours (just joking), you will then know your system and will be in the +30% speed, with safe voltages.

Happy overclocking!
Temps are good, now you can pull a real OC out of it.
I wouldn't trust the AI overclock that much, sometimes it can do weird voltages/frequencies.

Set the multiplier to 11x, the PCIE frequency to 100mhz, the front side bus to 240mhz (2640mhz), the ram divider to 533mhz (1:1.66), and raise the vcore to 1.25v-1.40v. Use prime95 with large FFTs for at least a half hour and make sure the temperature stays under 70C. If you can get that stable around 1.25-1.40v set the multiplier to 11.5 (2760mhz) and push the voltage some more to see if you can get that stable (so long as it's below 1.45v!).

Cheers and good luck!
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3
Quote:


Originally Posted by test tube
View Post

Temps are good, now you can pull a real OC out of it.
I wouldn't trust the AI overclock that much, sometimes it can do weird voltages/frequencies.

Set the multiplier to 11x, the PCIE frequency to 100mhz, the front side bus to 240mhz (2640mhz), the ram divider to 533mhz (1:1.66), and raise the vcore to 1.25v-1.40v. Use prime95 with large FFTs for at least a half hour and make sure the temperature stays under 70C. If you can get that stable around 1.25-1.40v set the multiplier to 11.5 (2760mhz) and push the voltage some more to see if you can get that stable (so long as it's below 1.45v!).

Cheers and good luck!

Thanks!! This is kinda what i was waiting for to manually do it, whereas i had no idea what numbers i should plug in. I also went ahead b4 i read this and bumped it up to the 5,8,10% options, using Prime95 for about 2hrs each showing stable 0errors. Running at 10% now 2530mhz,RAM 440mhz.VCore staying under1.35v, Multiplier x11.5, 220 fsb. Seems auto is doing ok for now? CPU Temp maxing around 53 during the prime95 test(ran for 2hrs). The VCore Voltage never really changed between the 3,5,8,10% OC options, it just always seems to stay around 1.31-1.35v. Also can i just change the multiplier and fsb without messing with the RAM?

Pic included with some Voltage and Temp figures.
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Looking good... you'll probably max out around 2.760ghz on that chip.

edit: If you have instability issues or non-booting, try dropping the hypertransport/northbridge multiplier. The hypertransport multi works the same, just multiply it by the bus speed, the default is 1800mhz so if you go above that it may get unstable.
Thanks, u seem to be right whereas when i did 11x @240fsb wouldnt boot or anything. Just running at the AI Overclocking 10% feature seems good enough for me.
Well, the FSB may be too high. Try these if you're feeling more adventurous:
Multiplier: 11.5x
PCIE frequency: 100mhz
front side bus 225mhz (2587.5)
ram divider to 533mhz (1:1.66)
vcore to 1.25v-1.40v
HT multiplier 8x

Multiplier: 11.5x
PCIE frequency: 100mhz
front side bus 230mhz (2645mhz)
ram divider to 533mhz (1:1.66)
vcore to 1.25v-1.40v
HT multiplier 8x

Multiplier: 11.5x
PCIE frequency: 100mhz
front side bus 235mhz (2700mhz)
ram divider to 533mhz (1:1.66)
raise the vcore to 1.25v-1.40v
HT multiplier 8x
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Quote:

Originally Posted by test tube View Post
Well, the FSB may be too high. Try these if you're feeling more adventurous:
Multiplier: 11.5x
PCIE frequency: 100mhz
front side bus 225mhz (2587.5)
ram divider to 533mhz (1:1.66)
vcore to 1.25v-1.40v
HT multiplier 8x

Multiplier: 11.5x
PCIE frequency: 100mhz
front side bus 230mhz (2645mhz)
ram divider to 533mhz (1:1.66)
vcore to 1.25v-1.40v
HT multiplier 8x

Multiplier: 11.5x
PCIE frequency: 100mhz
front side bus 235mhz (2700mhz)
ram divider to 533mhz (1:1.66)
raise the vcore to 1.25v-1.40v
HT multiplier 8x
I have been messing with it a bit more, although I have yet to mess with the RAM im letting that stay to auto for now. I also have not been manually changing the HT multi or speed, leaving that to auto as well for now. I am recording what auto has them set to after each change I do.
Tried multi 11.5x and 225mhz, but when i logged in was only reading as 223. Prime95 test Passed.Temps fine.
Bumped up to 11.5x, 230mhz seemed fine, but when doing the Prime95 largefft test within the 1st 2minutes had an error on cores 3 and 4 and stop running the worker for them. Changed to 11.5x, 227mhz prime95 ran good for bout 7minutes then got FATAL ERROR: rounding was .5, expected less than .4.Hardware failure detected! This error only showed on Cores 1,2,3- the 4th was fine.

I have noticed during recent Prime95 test, my Vcore voltage will go down, I have had this set manually to 1.3375 for quite a while, but for some reason during prime itwill be at 1.31-1.28

Links for Pics showing more settings/info:
http://i239.photobucket.com/albums/f...gerous1/26.jpg
http://i239.photobucket.com/albums/f...ous1/new26.jpg
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You have to drop the memory divider if you want it to run stable if your memory is 800mhz DDR2. Normally the FSB is at 200mhz and the memory at 4x that amount, but if you raise the FSB to say 235mhz, your ram is now running at 940mhz! That's probably what's limiting your overclock. To fix this you simply change the divider to 533mhz/1:1.66 ratio... now if you had an FSB of 235mhz, your memory would run at 783.33mhz.

You also need to turn the HT multiplier/NB multiplier down... your HT is at 2050mhz and the max should be 1800mhz. Remember that that multiplier number is just multiplied by the FSB, so it's easy to calculate.

Be sure to lock the pcie bus at 100mhz too!

The falling vcore is called vdroop -- just raise the vcore in the bios some more if that happens a lot.
Quote:


Originally Posted by test tube
View Post

You have to drop the memory divider if you want it to run stable if your memory is 800mhz DDR2. Normally the FSB is at 200mhz and the memory at 4x that amount, but if you raise the FSB to say 235mhz, your ram is now running at 940mhz! That's probably what's limiting your overclock. To fix this you simply change the divider to 533mhz/1:1.66 ratio... now if you had an FSB of 235mhz, your memory would run at 783.33mhz.

You also need to turn the HT multiplier/NB multiplier down... your HT is at 2050mhz and the max should be 1800mhz. Remember that that multiplier number is just multiplied by the FSB, so it's easy to calculate.

Be sure to lock the pcie bus at 100mhz too!

The falling vcore is called vdroop -- just raise the vcore in the bios some more if that happens a lot.

Thanks
Ok I have manually set the ram to ddr 533mhz, idk whta 1:1.66 meansi ddint see no options with that number involved.
As for the HT/NB multipliers im slightly confused, i have found what i think is the multiplier option titled CPU NB Mutliplier: has options of 5x-9x. I also see under the Chipset tab options for K8 <->NB HT SPEED: 200,400,600,800mhz,1,1.2,1.4,1.6ghz Also K8<->NB HT WIDTH downarrow8uparrow8 or down16up16. Wondering if these options need to b tweaked at all.
So right now im input 230 for fsb 11.5x cpu multi. The NB multi is at 7x whereas 8x times the 230 would be just over 1800. So is this all ok? Prime has been running bout 15min no errors, but i do notice all the cores will not finish test at the same time, is this normal? Noticed even though i input 230 in bios is showing as 231?

More pics:
http://i239.photobucket.com/albums/f...us1/230fsb.jpg
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>>Ok I have manually set the ram to ddr 533mhz, idk whta 1:1.66 meansi ddint see no options with that number involved.
They're both the same thing, some motherboards have ratios and others just have the speed @ 200mhz FSB. At an FSB of 240 your memory will run at 400mhz with this divider, but underclocking it some generally will not effect performance especially in things like gaming (that mostly has to do with the processor frequency)

>>As for the HT/NB multipliers im slightly confused, i have found what i think >>is the multiplier option titled CPU NB Mutliplier: has options of 5x-9x. I also >>see under the Chipset tab options for K8 <->NB HT SPEED: >>200,400,600,800mhz,1,1.2,1.4,1.6ghz Also K8<->NB HT WIDTH >>downarrow8uparrow8 or down16up16.

CPU NB Mutliplier: has options of 5x-9x <-- you want this at 7-8x when the fsb is greater than 200mhz... if it goes slightly over the stock rating at 8x (like 1840mhz or something) you should be fine, it's just when it starts to go over 1900mhz things can get iffy unless you have a 750 southbridge which your motherboard doesn't. This doesn't actually have much bearing on performance though so long as it's not less than 1600mhz or so.
K8 <->NB HT SPEED: >>200,400,600,800mhz,1,1.2,1.4,1.6ghz <-- You want this at 1.6ghz unless you can get it stable at auto (mine gets buggy as hell when the HT goes over 2000mhz)
Also K8<->NB HT WIDTH >>downarrow8uparrow8 or down16up16. <-- should be 16/16.

>>So is this all ok? Prime has been running bout 15min no errors, but i do notice all the cores will
>>not finish test at the same time, is this normal? Noticed even though i input 230 in bios is
>>showing as 231?
Yes, this is normal on both counts, cores finish the tests all at different rates, and sometimes motherboards will automatically change the FSB one mhz up or down for stability reasons. Mine only allows even FSBs.

It's looking better though.. You should be fine to push the FSB now and figure out the maximum overclock you can achieve at the voltages your cooler can handle =)

edit: I just realized that 533mhz was the wrong divider! 1:1.66 is what you want which is 667mhz on the mobo. This will let you get 400mhz @ 240mhz fsb, sorry. 533 is actually 1:1.33. I found that an FSB of 240mhz was where my athlon X2 was happiest, and the memory ran at the right speed and the system was the most stable, but I don't know if that extends to phenoms.
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Im at the 533mhz still 230fbs, 11.5xmult. Did 667 but when i ran prime windows rebooted. Is running at 230fbs with ram ddr2m533mhz alright, would i see the difference if i can get 667 to work stable?
Currently got Prime running, with 220fbs, 11.5xmulti. RAM at 667. seems ok for now.
Thanks again for all the help!!!!!!!!!!!
Quote:

Originally Posted by njdangerous1 View Post
Im at the 533mhz still 230fbs, 11.5xmult. Did 667 but when i ran prime windows rebooted. Is running at 230fbs with ram ddr2m533mhz alright, would i see the difference if i can get 667 to work stable?
It just brings your RAM bandwidth to 767mhz @ a 230mhz FSB, which is closer to it's rated 800mhz. It's strange that that would cause it to reboot though; the motherboard tightening the timings too much automatically. You might want to set the RAM timings manually to 5-5-5-15 (CL-tRCD-tRP-tRAS) when you run at 667mhz just to make sure it doesn't automatically lower them for some reason, and then try to see if it's stable.

Another good program for stability is the intel burn test: http://www.ultimate-filez.com/files/IntelBurnTest.zip

Run that for 5 or 6 cycles (~10-15 minutes usually), then see if it throws any error. It tends to be a little more stressful than Prime95 and takes less time (but Prime95 tests real world stability more; you can fail the intel burn test yet still pass Prime95 okay and have a solid overclock for most purposes, gaming isn't nearly as stressful as these tests).
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Timing now is 5-5-5-18. Still running Prime on 667, 230,11.5. Ill try upping the fbs tomo as its getting late. Thanks and i am gonna try that intelburn, b/c prime does take quitea bit of time.
Thank so much again!
No problem, good luck with your OC. =) Remember you can raise your vcore to enhance stability, just make sure the temps stay under 70C (closer to 60C is better) and to try not to go over 1.4v... The ranges aren't really listed for these processors but the highest voltage for the 9950 is 1.3v but you can likely do 1.35v-1.40v without hurting anything.
OCCZ usually gives up errors quickly. I prefer it when I'm working an OC. Then when I get to the higher fringe I confirm with Prime.

Also, sometimes a mear tweak of other voltages may be what is in order. So, if you have the patience, try one or more increase on the various HT, and chip set voltages. If you just up all, you'll not know what needed it and what didn't. More when not needed is not always a good thing.
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