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Stubborn Phenom 9950

Last response: in Overclocking
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June 8, 2010 6:11:36 PM

Hi people,
I've a 140w Phenom 9950. First with the crappy MSI K9A2 motherboard the max stable speed I got was 2700 using stock voltage. Later as the motherboard came defective, I changed it for a ASUS M4A79 Deluxe. This motherboard is newer, so it includes extras like AMD ACC, a six pin CPU connector (that I'm using), etc. Again the same problem, the only speed I can get is 2700 with the difference that in this mobo I need extra voltage! 1,35v to get it stable, anything higher is BSOD.
To be conservative I raised the multiplier to x14 to achieve 2800. As it was unstable, I enabled ACC to auto and Prime95 lasted a little more. With ACC set to +4 it lasted a little more again. I raised the voltage to 1,4v and it looked more stable, but not 100%, and 1,4v to achieve 2800 is ridiculous.
I noted that core 3 is the culprit of instability as in Windows event log I saw MCE errors reporting core 3 as the culprit of BSOD.
Temperatures are OK.

What can I do?

More about : stubborn phenom 9950

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a c 297 V Motherboard
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June 8, 2010 6:52:08 PM

Hi.

The problem here isn't the mobo is the CPU. The 1st Phenom generation aren't good overclockers CPUs.

I will assume that ur old mobo was the K9A2 Platinum, so, for probe my theory take a look of the following picture.

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June 8, 2010 7:35:10 PM

Hi SAINT19,
Thanks for your reply. I said that K9A2 Platinum board is crappy not due to limited OC of 9950, but the K9A2 I received was defective (CMOS batteries not lasting more than 1 month or less if I unplugged the mobo from the wall), so it was short circuited somewhere from factory.
Returning to main topic. Am I one of these unlucky people that received a limited Phenom 9950 processor? I know that first Phenom generation sucks in terms of OC but I saw many times that people are ocing their Phenom 9950 until 3 GHz. What's the max voltage you recommend to oc a 9950 considering that temperatures are OK?

Thanks.
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June 8, 2010 7:48:17 PM

Well the new board that you linked maxes out at 140w which is the stock for your cpu so you wont be getting much of any additional overclock out of your cpu. You might as well buy a Phenom 2 quad and part with your 9950 on the second hand market.
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a b À AMD
a c 297 V Motherboard
a c 293 K Overclocking
June 8, 2010 8:07:10 PM

This are the specifications of ur RAM.

The max that AMD recommend is 1.30V and 61C max. For the voltage i would stay @1.30V or below but for temps I think that ur CPU is safe with 65C or less.
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June 8, 2010 9:46:06 PM

Not a good cpu to overclock, I am running the Phenom 9950 125W

I have always had it running at 2730Mhz, this is simply by jumping the speed from 200 to 210

I managed to get it at 3ghz at 1.45V but honestly for the little performance gains, it's rather pointless to stress out the cpu to that point.

At 2.73 I run Bad company 2 full graphics away at 1920x1080 so I would recommend milking it an extra year and then jumping to an X6.

Its a pretty decent quad and honestly, most people don't need more unless you run very demanding software.
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June 9, 2010 12:04:09 AM

Hi,
Yes, that's true. I've an ASUS 5770 CuCore GPU and I noticed no bottleneck from the CPU.

C00lIT said:
Not a good cpu to overclock, I am running the Phenom 9950 125W

I have always had it running at 2730Mhz, this is simply by jumping the speed from 200 to 210

I managed to get it at 3ghz at 1.45V but honestly for the little performance gains, it's rather pointless to stress out the cpu to that point.

At 2.73 I run Bad company 2 full graphics away at 1920x1080 so I would recommend milking it an extra year and then jumping to an X6.

Its a pretty decent quad and honestly, most people don't need more unless you run very demanding software.

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a b V Motherboard
a c 235 K Overclocking
June 12, 2010 8:01:22 PM

andregoujon said:
I noted that core 3 is the culprit of instability as in Windows event log I saw MCE errors reporting core 3 as the culprit of BSOD.


I would say you have a bad CPU, have you told AMD support about this problem?

Even with a 140w 9950 BE you should be able to easily get to 3G, I had my 125w 9950 OC'd to 3.4G.



Get in touch with AMD and RMA that CPU it has a 3 yr warranty if it was a boxed retail version, you should be getting way more than your are out of it, and you shouldn't be getting individual core errors or individual cores dropping out, its not like an Intel 775 Core2 Quad, where you had to be a master settings juggler to keep all 4 cores running, its AMD and the memory controller is on the die itself.

OOPs Sorry missed it wasn't a Black Edition.
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