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AMD® Phenom™ II Overclocking Thread

Hello every one, I've read a lot of the thread but not all, just after a bit of advice.

I recently built a new system and had my first ever go at overclocking.

spec is
phenom ii x2 550BE
asus m4a785td v evo
4GB G.skill ripjaw 1600MHz

I managed to go up to 3400MHz on the multiplier with every thing else on auto and the system was stable in prime95.

At 3500MHz I had to increase the Vcore to 1.36250v every thing else on auto for it to be stable in prime95.

At 3600MHz
I've increased Vcore to 1.40625v
The CPU-NB FREQUENCY to 12.00x
the CPU-NB voltage to 1.21875v
And the load line calibration to 19. 35%

I ran Prime95 for two and a half hours with no crashes or errors but then core 1 dropped from 100% load to 0%
core 0 stayed at 100%
core 1 would go up slightly to around 7% but then drop back down to 0% It never went back up to 100%

I stopped the prime test and it showed no errors or faults?
I've looked through the thread but cant see any answers for why this happened?


I plan to try and get the system stable at 3700MHz

at the moment at 3700MHz I've got the following settings
Vcore at 1.41875
CPU-NB frequency at 12.00x
CPU-NB voltage at 1.21875
load line calibration at 19. 35%

the system was unstable in prime after about 45 minutes (BSOD) and I was getting core temps of 38-39c And CPU temps of 42-43c

I dont want to push the Vcore up to much more as I dont want to high temps.

Just looking for some advice about why one of the cores dropped to 0% when running prime95 blend test.

and any more general advice about getting it stable at 3700MHz.

Also I currently have the system back at 3500MHz with the settings i found were stable. Is it safe to just return the system to these settings at any time when over clocking higher?
[e.g] I've found the system to be stable at 3500MHz with a Vcore of 1.3500 etc etc Can I just return to these settings without stability testing again?

I've got a thread here with some more info

http://forums.overclockers.co.uk/showthread.php?t=18132269

Cheers.
 
what is your CPU stock clocks?
i am looking at going for around 3.5overclock on my 955be
i know how to increase the multiplier thing but not too sure about the voltages or anything
did you do it via trial and error or did you find some helpful info somewhere for your CPU?
 
Gareth could i have your advice on something if you dont mind, i have just tried to clock mine to 3.5ghz but as always i get a restart, i keep everything on stock at 3.4ghz with no probs, i have even tried 3.6ghz with 1.4v and increasing the cpu-nb to 2200 but i did not change the cpu-nb voltage and i also got a restart, Would my memory be holding me back? i have 4gb of kingston hyper x 1066 ram which by default is clocked to 800mhz would i need to set this to 1066 to achieve the 3.6ghz oc i am looking for?

Also would someone be able to tell me the stock and max voltage for the cpu-nb

Hope u can help


Thanks
 
Quick question - peeps mention setting load line calibration to a certain % i.e. 19 or something - the only options I have in my BIOS (bearing inmind its an 890GX chipset) are:

CPU Loadline Calibration: AUTO, ENABLED or DISABLED
CPU/NB Loadline Calibration: AUTO, ENABLED OR DISABLED.

As you can see no mention of percentage values!
I've always left these at AUTO.....

Best I've had my system @ is 1.45v Freq: 224 (refuses to go above) 3800Mhz Mem @ DDR3-1497, 2475/2475 for CPU-NB/HTT. CPU Temp 46Degrees C

Struggling to get this now though fully prime stable (Had a 15 hour run on this earlier last week) - seems that the more I play the worse my overclocking gets overall!!
 
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Hi gareth i am using the multiplier i have a BE edition (in sig), i have tried changing the memory freq in the bios to 533mhz and i entered the timmings 5-5-5-15 at 2.2 and my computer just gave me a error message on post could not understand a word of it and i then had to reset the cmos to default back.
 
I will try some looser timings, if i am upping the ram speed all be it to its so called native speed which is the reason i bought the 1066 ram do i need to increase anything like the cpu-nb freq & voltage or should it still be ok at stock 1.35vcore cpu-nb voltage 1.1v cpu-nb freq 2000, The only thing i can think is my motherboard states if i run my memory at 1066mhz i can only have 1 stick per channel i have both my sticks in slot 3&4 on the board which are the same colour and according to cpuz is running in dual channel mode, the strange thing is in the manual it states that channel A is dimm A1 and dimm A2 which according to the motherboard manual diagram is slot 1&3 going from left to right and channel B is dimm B1& dimm B2 which shows again on the diagram as slot 2&4, as i stated my memory is in slot 3&4 which going by the manual would be dimm a2 and dimm b2 which would not be a channel if you see wat i mean

i am really confused by this so if some could help me out id be so gratefull.
 
liamcrane, I'm using the same board as you as well as DDR2-1066 memory! :)

I've got both sticks of RAM next to each other in the slots nearest the CPU . . . to get the memory running at full speed leave the Memory frequency BIOS setting at [Auto] which should give a 2:1 ratio, then change the CPU-NB/HT-Link multi to [x8] and you should be sorted to change the Ht Ref clock from [200] all the way to [266] . . . . you will probably need to lower the CPU multi also with the higher Ht Ref Clock . . .

am2ddr21066.jpg
 
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Thanks for that wayne kinda strange we seem to have the same on everything lol i cant put my 2 sticks of ram in the 2 slots nearest the cpu cos of my megahalems cooler being so dam big!!! One thing tho by upping the ht ref clock wont i also be overclocking my cpu at the same time? im using my multiplier at the mo to try and oc my cpu dont no if that would un stable my system upping the ht ref clock, i know im prob wrong but wouldn't i need a higher cpu-nb and ht link muliplier if im running faster ram?

thanks again
 
Famas: Hello there and welcome to the thread, please read the "Welcome post" and enjoy your stay :) . . . I just read your post (#1361) and admit that sounds like a strange problem you have there? :p . . . have you reset the system back to stock to see if Prime runs ok? . . . I had a similar wierd issue with the CPU multi dropping to [x4] while Prime was Blending, turned out to be a heat related issue and by adding a 120mm fan over the PWM's the problem has gone away . . .

Technics: nice results there and don't forget to include your name in the screenshots! :)

thingemajib: Also some nice results there, 4GHz quad from a 555, happy camper no doubt! :) . . . don't forget to include your name in the screenshots!

liamcrane: Yes by changing the base Ht Ref Clock from 200MHz to 266MHz you will be effecting *everything*, CPU MHz, HT-Link Mhz, CPU-NB MHz etc . . . . the [x8] multi on CPU-NB/HT-Link will give both of them a base 2128MHz speed which should be fine for starters (both of them run up to 2.5GHz using stock voltage on my system), you will just need to re-work your CPU clock out again using multiples of 266 . . . .
 
Thanks wayne i will give that a try can i just ask what voltage and timmings did you set your ram to? my kingston hyperX states it can run 5-5-5-15 at 2.2v. Im trying to get a stable 3.6ghz thats all i want :) so i guess a multi of 13.5 or 14 with a fsb of 266 should hopefully give me what i want we shall see hey
 
Liam: The Memory Voltage/Frequency/Timings are all on [Auto] . . . I tested the Kingston in my older LGA775 system and they ran DDR2-1066 speeds @ 1.8vDimm . . . apparently some sticks need 2.1/2.2volts? . . . anyway [Auto] is working well here! :)
 
if i increase the Multiplier(i think?) to 17.5 (to get 3.5Ghz) what else will i have to increase for a stable system - if i leave all at auto will it set it self to the correct volts and everything?
 
Cheers for your reply Big.Wayne

At 3500MHz I got the same problem with the core dropping to 0% But by upping the Vcore slighty it seemed to go away, I ran 8 and a half hours of prime with no errors.
Temps at 3500MHZ are
core 35c
CPU 38c

Its always core 1 that drops?

I'll try it again at 3600MHz with a slightly higher Vcore and see if I can get it stable.

I did a quick run at 3700MHz with these settings.
Vcore 1.41875
CPU-NB frequency 12.00x
CPU-NB voltage 1.21875
load line calibration 19. 35%

At these settings it ran prime blend test for about 45 mintues but then it crashed.
I was getting temps of
core 39c
CPU 43c
MB 35C

How do these look?

To be honest if I can get it stable at 3600MHz i'll be more than happy?

cheers.
 
famas, with a Black Edition chip overclocking should be "really" easy if you take your time and take it step by step, for the basics I see no reason why you can't set all voltages to [Auto] with the exception of vCore which will need to be adjusted upwards according to the CPU frequency.

Should be 18x200 with the correct vCore = 3.6GHz . . . once that is worked out and tested for stability then you can either go for more sCPU speed or leave it at an easy 3.6GHz and begin playing with the CPU-NB frequency and volts . . . I;m not sure why one of the cores on your chip is dropping off under prime load? . . . have you reset the system to stock to see if Prime works correctly? . . . If it works fine at stock but goes weird when overclocked then its either a voltage issue or perhaps the PWM/Mosfets overheating?
 
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