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AMD Phenom II x4 965 3.7ghz 18.5x multiplier

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May 5, 2010 3:28:00 AM

Running approximately 41C idle, approximately 57-59C 100% load via Prime 95.

I have only manipulated the multiplier; voltages are all auto, except for my Memory which I manully inputted to Manufactures specifications.

My Vcore was stock 3.4ghz at 1.393 - 1.396 via BIOS's "hardware monitor".

Now at 3.7ghz, I'm at 1.492-1.495...

Why Does the VCore increase as you increase the multiplier even though Vcore is set on "AUTO"?

Should I continue to push it, even though 100% load temp is 59C and max temp listed on AMD Phenom 965 is 62C?

CPU cooler is Xigmatek Dark Knight w/stock 120mm fan and artic silver 5 thermal compound.

Ram is 4GB G.Skill DDR3 at 1600Mhz (manually configured)

Thanks for any responses.
May 5, 2010 3:50:58 AM

my 955 b.e. does the same thing on my msi gd70 board. anything over stock clocks and the vcore bumps it's self up to safe max. i wouldn't go over 1.5 vcore since your temps are boarderline.if you move away from auto you could just manually lower your vcore and check stability. drop a little at a time,if you can pass an hour or two of prime at say 3.7ghz @1.45 you should be good. just remember to slow down your ram before o.c. to ensure your cpu is stable before asking too much from your ram. o.c. one thing at a time to ensure each are stable at a given setting.
May 5, 2010 4:10:38 AM

Ah, so your saying to bump down vcore........ interesting....


My 4GB DDR3 defaults to 1333Mhz on my board, but reading 4ryan6's guide on "Overclocking BE AMD processors", it states to manually adjust the RAM settings to manufactures settings, which in my case, are 1600Mhz.
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May 5, 2010 5:57:18 AM

Ok, since my mobo on AUTO raises my Vcore, I put it MANUALLY at 1.40, which was stock vcore at 3.7ghz and I'm stable.
a b À AMD
a b K Overclocking
May 5, 2010 8:01:46 AM

xxenergyxx said:
Running approximately 41C idle, approximately 57-59C 100% load via Prime 95.

I have only manipulated the multiplier; voltages are all auto, except for my Memory which I manully inputted to Manufactures specifications.

My Vcore was stock 3.4ghz at 1.393 - 1.396 via BIOS's "hardware monitor".

Now at 3.7ghz, I'm at 1.492-1.495...

Why Does the VCore increase as you increase the multiplier even though Vcore is set on "AUTO"?

Should I continue to push it, even though 100% load temp is 59C and max temp listed on AMD Phenom 965 is 62C?

CPU cooler is Xigmatek Dark Knight w/stock 120mm fan and artic silver 5 thermal compound.

Ram is 4GB G.Skill DDR3 at 1600Mhz (manually configured)

Thanks for any responses.


Anything above 55°C is critical frankly, you do not want to push it further. I suggest lowering the vCore down a bit. Also, vCore increases when you increase the CPU multiplier because the CPU is running at a higher speed and thus the vCore is automatically configured to provide the CPU a bit more power.

May 5, 2010 8:25:23 AM

K Thank you for your help.

I have 19x multiplier at 3.8ghz at the moment.

I lowered the vcore to 1.4750.

I tried everything lower than 1.47 but FAILED Prime95.

I'm testing for stability at the moment. 100% load Prime 95 at 55°C


What do you think?>
a b K Overclocking
May 5, 2010 5:46:50 PM

Is your 965 the IBOX or MBOX? If it's MBOX, it should run okay just slightly undervolted. I left the BIOS on auto voltage on my 955BE MBOX an at 3.8 Ghz, the vocre was 1.375 ~ 1.4, passed P95.

I went back down to 3.6 Ghz and manually set the vcore to 1.29 and guess what, idle temps dropped from 35 to 31 and on full load the vcore goes only 1.31 and passes Prime 95.

You could be overvolfing your CPU. How old is it and did you buy it used?
a b K Overclocking
May 5, 2010 6:07:55 PM

hundredislandsboy said:
Is your 965 the IBOX or MBOX? If it's MBOX, it should run okay just slightly undervolted. I left the BIOS on auto voltage on my 955BE MBOX an at 3.8 Ghz, the vocre was 1.375 ~ 1.4, passed P95.

I went back down to 3.6 Ghz and manually set the vcore to 1.29 and guess what, idle temps dropped from 35 to 31 and on full load the vcore goes only 1.31 and passes Prime 95.

You could be overvolfing your CPU. How old is it and did you buy it used?


CPUID can tell you if you have a C2 stepping CPU (original) or C3 stepping, which is lower power usage and OC's a bit nicer. This is what he meant by the IBOX/MBOX question. If you have a C2 stepping 965, you will use more volts for stability, and thus run higher temperatures when compared to a C3 at the same speed.

With my C3 965, I can also run 3.6ghz undervolted, though not as much (1.32v) but need to run 1.41v to stabilize 3.8ghz. 3.825 is my daily setting (the extra .7% from the motherboard) with a 212+ HSF, and have 30/49c temps, and your HSF is comparable. Just from looking at your results and temps, my guess is that you have a C2 stepping version of the 965.
May 5, 2010 6:15:08 PM

It's an MBOX which is C3 125watt.
May 5, 2010 6:17:14 PM

By anyway, I don't know, because the only way I could get 3.8ghz stable was at 1.4750 CPU volts manual set through BIOS.

I failed PRIME 95 with any volts lower than that.

I don't know how the hell you ran 1.375 ~ 1.4 at 3.8ghz
a b K Overclocking
May 5, 2010 6:59:12 PM

xxenergyxx said:
By anyway, I don't know, because the only way I could get 3.8ghz stable was at 1.4750 CPU volts manual set through BIOS.

I failed PRIME 95 with any volts lower than that.

I don't know how the hell you ran 1.375 ~ 1.4 at 3.8ghz



I still say you're overvolting the CPU.

here's a screenshot 20 minutes into editing an HD video...


http://yfrog.com/3ofullload955bej

3.6 Ghz @ 1.28v full load.

I will go back and set it to 3.8 Ghz and do a test with lower voltages.

a b K Overclocking
May 5, 2010 7:06:52 PM

Lets not forget that every chip is different, and variances like these are bound to occur.
May 5, 2010 7:14:12 PM

Damn. What do I do? If you say I'm overvolting at 3.8ghz with 1.4750, but I fail 3.8ghz with any less voltage, what can I do....


Should I go and re-install my thermal compound? I really wanted to hit 3.8ghz for a 24/7 overclock....

I really didn't want to go over 1.4500 vcore either (according to 4ryan6's guide also)....

So, is there a STRICT verdict as to the MAX. CPU voltage for these C3 125watt 965 CHIPS?

I hear 1.40max and then I hear 1.55max???

Thanks for your help though guys, I really appreciate it.
a b K Overclocking
May 5, 2010 8:08:08 PM

Set your RAM to auto. How many sticks? If 4, try 2 stiks only in dual channel

Multiplier to 19. vcore to 1.41

everything else on auto

I have a feeling your manual RAM settings are the source of instability

who cares about 8 or 9 timings (with no performance difference)?

http://yfrog.com/86fullload955be38ghzalmosj








May 6, 2010 1:37:49 AM

K. Let me try that. I had my RAM manually set to 1600Mhz and manufacturers SPECS, but my RAM actually DEFAULTS on my motherboard to 1333Mhz.
a b K Overclocking
May 6, 2010 4:07:49 AM

Once you get stable @ 3.8 Ghz, you can start tweaking your RAM. They'll probably need a bump in voltage (.05 past manufacture specs) ) to go 1600 Mhz.
May 6, 2010 5:59:41 AM

K thanks for your help, I really appreciate it. Helpful answers are hard to come by nowadays, I appreciate you taking time out of your day to help me.
a b K Overclocking
May 6, 2010 1:48:58 PM

xxenergyxx said:
K thanks for your help, I really appreciate it. Helpful answers are hard to come by nowadays, I appreciate you taking time out of your day to help me.


No worries. I also received a lot of help (and still do) from THG. Let us know how it goes.
a c 239 K Overclocking
May 12, 2010 12:06:14 PM

xxenergyxx said:
Running approximately 41C idle, approximately 57-59C 100% load via Prime 95.

I have only manipulated the multiplier; voltages are all auto, except for my Memory which I manully inputted to Manufactures specifications.

My Vcore was stock 3.4ghz at 1.393 - 1.396 via BIOS's "hardware monitor".

Now at 3.7ghz, I'm at 1.492-1.495...

Why Does the VCore increase as you increase the multiplier even though Vcore is set on "AUTO"?

Should I continue to push it, even though 100% load temp is 59C and max temp listed on AMD Phenom 965 is 62C?

CPU cooler is Xigmatek Dark Knight w/stock 120mm fan and artic silver 5 thermal compound.

Ram is 4GB G.Skill DDR3 at 1600Mhz (manually configured)

Thanks for any responses.



Quote:
Why Does the VCore increase as you increase the multiplier even though Vcore is set on "AUTO"?


Because it takes more voltage to stably run a higher multiplier, most motherboards that have automatic overclocking features already set the voltage higher to try to achieve stability even though it may actually be too much applied voltage, that is why its best to disable any automatic overclocking features and any AMD CPU features that could cause problems.

Some motherboards like ASUS for instance will require you manipulating your manually set voltage, to attain your OP/SYS running target voltage you're after, juggling that can get frustrating but is achievable.

Quote:
Ram is 4GB G.Skill DDR3 at 1600Mhz (manually configured)


What settings are you using?, and would you supply the exact model #s of the modules you have, I have seen G Skill post different timings at the website than whats stickered on the modules, that could very well be your problem.

And is your motherboard actually delivering the voltage you're manually setting on the output side?

Sometimes you have to manipulate the memory manually set voltage to achieve the output voltage you're actually after, if your motherboard increases or decreases it itself.

GTGTW will check back later.
September 16, 2010 1:36:08 AM

xxenergyxx said:
By anyway, I don't know, because the only way I could get 3.8ghz stable was at 1.4750 CPU volts manual set through BIOS.

I failed PRIME 95 with any volts lower than that.

I don't know how the hell you ran 1.375 ~ 1.4 at 3.8ghz



I'm running 4.08GHz at 1.4v. Should I be volted higher?
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