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OCing a Phenom II x 4 925 2.8 C2?

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a b à CPUs
January 1, 2012 4:18:09 PM

I have a Phenom II x 4 925 Deneb C2 stock 2.8 OCd stable @ 3.5 currently

here is specs best I can remember (too bad you can print out BIOS LOL)

Cpu: Pii 925
Name: SMP
Stepping: C2
Frequency: 3500
ref*multi: 250 x 14
CPU voltage: 1.50
nb frequency: 2000 in BIOS (reported by HWinfo at 1600)
VDDD - just into the yellow two steps
RAM: 4GB 1333Mhz DDR3 Patriot Signature @1066 1.6v stock timings 9-9-9-24 currently at 6-6-6-18 @1066mhz
Motherboard: Asus M4A77TD AM3
Cooling: AMD 140w OEM dual heat pipe 80mm
120 Sicklefow front intake
120 Sickleflow rear exhaust
80mm side intaking into air horn directly above CPU HSF
60mm rear exhaust PCIe bus
OS: 7 64-bit

also Hyper Transport is set to 1250mhz
mild voltage increase

PCIe is set 110 (stock 100 - max allowed 150)

running Prim95 stable with aTI Tray tools running 3D stress test

temps @ 68F room

CPU max - 55c
HD 30c
GPU 80c
Mobo 30c


couple of questions:

I tried dropping ram to 1.5v stock and setting for 1333
whch it was reported in BIOS and Hwinfo running at 667 (1333)

seemed stable so I raised the HT speed
I had both the NB and HT at 1600
with mild voltage increase
booted to windows and ran desktop fine
but failed after 20 mins on stress test

I want to get the RAM higher in speed with lower voltage if possible
also would like to get the HT speed a little higher
right now ram is 1066
HT is 1000

is this possible
it is very stable with settings at 3500mhz
But I want to see if I can raise bus speeds
and also drop temps if possible

Any 925 owners advice would be greatly appreciated

also any tips and tricks from PII OCers is greatly appreciated

update- I just raised the NB freq to 2250 and the HT speed to 1750
runs very stable and same temps
I think I will run the ram at 1066 but lower the voltage to 1.5 and see what happens


thank you
Happy New Years and Peace to All

More about : ocing phenom 925

a b à CPUs
a b K Overclocking
January 1, 2012 5:52:34 PM

By the way, nice job getting it stable, but your CPU voltage is too high. You can damage the CPU with that. The max voltage is 1.425v. You will kill your CPU.
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a b à CPUs
January 1, 2012 7:28:09 PM

I would like to respectfully disagree
been doing much reading on OCing Phenom II Denebs
many different sources say that 1.55 is highest you can go safely
http://www.techreaction.net/2009/05/28/phenom-ii-am3-ov...

that is just one source there are others
I know that AMD stated in specs that 1.425 is safest
but they always stay on the incredibly safe side
also on my Asus mobo 1.50 is only a couple steps in the yellow
way before Asus puts into the red

I was a major OCer in the Athlon XP days so I know how to play it safe
just a little rusty :) 

i did just raise my ram to 1333mhz at 1.6 and I will try backing down to 1.50
if it is not stable at stock then I will try 1.55

I got the NB freq up to 2000 and the HT freq up to 1800

max temp in 70F with prime95 is 55c with the GPU fully loaded at 100 percent with a GPU stresst tester (GPU max temp is 81C so pretty happy so far
I had it run with P95-64 with GPU 100 percent for two hours stable

I know I could push it to 3.6-3.8 with more voltage but dont want to go over 1.5v
becuase heat becomes a issue
would need a better cooler than the AMD OEM 140w HSF
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a b à CPUs
a b K Overclocking
January 1, 2012 9:18:44 PM

Alright, well, as long as CPU life doesn't degrade. Generally they don't stay within .125v of being so safe, but, if you fell comfortable and temps are good, go ahead. Plus, the PII 925 will need a replacement within a couple of years anyway.

Happy overclocking! :) 
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a b à CPUs
January 1, 2012 11:55:40 PM

Thank you
I would feel safer if the voltage is lower and have been studying more about it
still have alot to learn

it would be nice to see somebodys bios specs for a 925 just as a guideline
i am definitley no expert at OCing
been more than 7 years since I did it LOL

and I do agree with you that the volts would be better lowered
I have seen many PHII x 4 Denebs running at lower voltage
but usually BE editions which are obviously better

Question
a 925 running at 3.5 is equal to what Phenom II x 4?

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Best solution

a b à CPUs
a b K Overclocking
January 1, 2012 11:57:32 PM

your ram timings are too tight, relax your ram timings to default and keep pci at 100

and keep an eye on your temp
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a b à CPUs
January 2, 2012 12:22:09 AM

thanks truegenius
I will try that after football game
hopefully if I relax timings (9-9-9-24 stock)
then I can back off CPU voltage
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a b à CPUs
a b K Overclocking
January 2, 2012 1:16:47 AM

king smp said:
Thank you
I would feel safer if the voltage is lower and have been studying more about it
still have alot to learn

it would be nice to see somebodys bios specs for a 925 just as a guideline
i am definitley no expert at OCing
been more than 7 years since I did it LOL

and I do agree with you that the volts would be better lowered
I have seen many PHII x 4 Denebs running at lower voltage
but usually BE editions which are obviously better

Question
a 925 running at 3.5 is equal to what Phenom II x 4?

It is like a 970 BE. It has the same speed, same architecture, and same cache. 3.5Ghz on a C2 chip without a BE is pretty good. I agree to set that RAM back to stock. You probably won't notice a difference is speed, and it should help you achieve a more stable OC with smaller voltages

By the way, this is off topic, but where you the guy I was talking to once you changed his C2D physically to OC it with an OEM machine?
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a b à CPUs
January 2, 2012 1:48:45 AM

yes I BSEL Pin Modded my E4500 2.2 800 FSB to 2.93 1066FSB also called bootstrapping
http://www.overclock.net/t/341123/intel-bsel-vid-mod-gu...

works good
extremely stable

also helped a member with putting in a Q6600 in a Dell optiplex
Pin modded from 2.4 1066 to 3ghz 1333
built a dell for $400 with a C2Q 3ghz antec 550w PSU external HD 6770 6gb ram

and I dropped the timings to stock 9-9-9-24
and was able to be stable so far at 1.48v (was 1.5)
so great advice
still hoping to get under 1.45
HT freq is at 1800
NB is at 2000
ram at 1333 9-9-9-24 1.55 volts
PCIe still at 110
will try dropping PCIe to 100
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a b à CPUs
a b K Overclocking
January 2, 2012 2:19:56 AM

PCI @ 110 shouldn't be bad. Just it can hurt things if it goes to high I have heard. I have heard it can give extra stability by adding a little though. Also, I had my 1.65v RAM running at 1.5v stable, but when I OCed, I was getting crazy blue screens until I put the voltage to 1.65v. It is very solid now. If you set the voltage to 1.5v, you could probably get a better OC without putting the voltage up too far from what it is at now. Just a suggestion, but if you don't plan on going past 3.5Ghz and you can get the RAM stable @ 1.48v, then great! :)  I hope it all works!
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a b à CPUs
January 2, 2012 2:29:45 AM

CPU is at 1.48
Ram is at 1.55
and did a half hour of P95 while browsing Toms at same time
going to try 1.50 on ram
then I think I am done :) 
thanks to everybody for the help
eventually going to try for 3.7-3.8 but that can wait a long while
need better cooling too
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a b à CPUs
a b K Overclocking
January 2, 2012 3:15:55 AM

king smp said:
CPU is at 1.48
Ram is at 1.55
and did a half hour of P95 while browsing Toms at same time
going to try 1.50 on ram
then I think I am done :) 
thanks to everybody for the help
eventually going to try for 3.7-3.8 but that can wait a long while
need better cooling too

Also, one half hour isn't a very long test. You should be looking at around 6 hours. Or are you talking about just testing the voltage of the memory now?

Anyway, good OC on a C2 and non-BE chip! Looks good! :) 
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a b à CPUs
January 2, 2012 4:00:27 AM

I use a half hour to see if it has a chance of being stable
then I usually run it for at least two hours
tonite I will set it up for testing before I got to bed
if all goes well I will be picking a BA tomorrow
kind of a tough choice for BA
Hostile Donut put in alot of work
but true genius with the ram timing advice really helped alot
too bad I cant split it between you two LOL
I will feel bad either way I choose
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a b à CPUs
January 2, 2012 12:36:04 PM

Okay
Prime95-64bit ran six hours blended test no errors
success

NB freq - 2000
mild voltage raise on NB
HT freq - 1800
mild voltage bump
CPU volt - 1.48v
14 x 250 = 3500mhz
PCIe - 110
ram - 1333 CL9 9-9-9-24
ram volt- 1.56
temps in 68F room
max temp CPU - 52c

I think I could get to 3.7 with a voltage increase
but not worth the heat and risk to the chip

thanks to everybody for helping
much appreciated
tough BA to pick


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a b à CPUs
January 2, 2012 12:37:12 PM

Best answer selected by king smp.
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a b à CPUs
a b K Overclocking
January 2, 2012 2:23:13 PM

Nice overclock! I am glad it was stable for you! :)  Nice way to bring a dead CPU back to life!
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a b à CPUs
January 2, 2012 10:38:58 PM

thank you
I felt bad about picking a best answer
I went with true genius because relaxing the memory timings
was the key
but you did alot of work
still wished there couldve been two best answers :) 
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a b à CPUs
a b K Overclocking
January 2, 2012 10:41:44 PM

Don't feel bad! I didn't have the answer! Which means I don't deserve one! :) 
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a b à CPUs
January 3, 2012 12:48:16 AM

well thanks to everyone for their time and help
Peace to All in the New Year!
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!