965 C2 - 3.7 with stock NB

gcwebbyuk · Mar 23, 2010

I try and run my CPU with CnQ on to keep noise down when it is idling.

I have found that overclocking in the BIOS turns off CnQ, however using AOD in Win7 it keeps CnQ running - which is great.

However this means I am stuck with the stock NB frequency of 2000.

So far I have managed 3.7GHz with 1.475v and it completed an hour of OCCT PSU test with no errors.

I have it running Prime95 today while I am at work - so am hoping it is still running succesfully!

Does this seem like the maximum overclock with stock NB?

To be honest, the benchmarks I ran (CPC2007 suite) was very close between 3.7 with stock NB and 3.7 with 2.4 NB, so am happy to stick with it.

Just wondering if this is the limit for OC with stock NB?

howetechnical · Mar 23, 2010

Sounds like it is the limit to me. If it's more important for you to know that C&Q is on, then you're limited if your BIOS turns it off during OC.

You'll want to run Prime94 at least 4 hours (always recommended by others to go 8+ hours) to ensure it's as stable as can be. With that CPU-NB though, I don't know how it could be fully stable. I had to bump mine up to 2.6GHz @ 1.35v for 4GHz CPU OC. Even at 1.25v for the NB, it wasn't stable past 5 hours. Now it's stable for at least 12 hours (turned it off at that point).

gcwebbyuk · Mar 23, 2010

I tried for 3.8GHz but it failed after a few minutes in OCCT.

I noticed from your other thread you have 4GHz and your temps are similar to mine. Unfortunately I have the C2 chip with a higher TDW

gcwebbyuk · Mar 23, 2010

Prime ran for about 9 hours, and bombed out with a reboot 30 minutes before I got home.

I re-ran OCCT again which seemed fine, but then using the pc to import some music into iTunes it rebooted again.

Have dropped back to 3.6GHz. To be honest 3.4GHz is fine, but I just like to dabble!

howetechnical · Mar 23, 2010

Yeah, you need to up the CPU-NB frequency as well as voltage to get a stable OC on these chips.

Grosjambon · Mar 23, 2010

Well. U should check my thread also (on the second page). I have a 955 c2 at 3.8 here is spec.
Phenom II 955 3.8 ( 19*200)
Phenom II 955 @ 3.8 vcore at 1.45
Cpu-nb at 2400mhz 1.25vcore
Ht @ 1400mhz 1.20vcore
It wasnt stable Ht higher than 1400. It failed occt @ 1600-1800-2000-2200.
Im under water so temps are not a problems.

gcwebbyuk · Mar 23, 2010

Thanks for the info - point is I want to keep stock NB speed so that CnQ works - looks like 3.6GHz is they way to go

gcwebbyuk · Mar 26, 2010

I have just run some benchmarks using Custom PC Magazine Benchmark Suite and compared them to my results with the NB oc'd as well - not much in it strangely!

CPU @ 3.7GHz - NB @ 2.4GHz:
Image Editing: 1137
Video Encoding: 1852
Multitasking: 1100
Overall: 1368

CPU @ 3.7 GHz - NB Stock CnQ Enabled:
Image Editing: 1195
Video Encoding: 1790
Multitasking: 1119
Overall: 1368

CPU @ 3.6GHz - NB @ 2.4GHz:
Image Editing: 1118
Video Encoding: 1808
Multitasking: 1100
Overall: 1342

CPU @ 3.6 GHz - NB Stock CnQ Enabled:
Image Editing: 1166
Video Encoding: 1751
Multitasking: 1094
Overall: 1337

The CnQ benchmarks were started with the CPU in low multiplier/low voltage mode, so they include the lag to switch to full speed too.

I was able to push the CPU up to 3.8GHz to run the test, but it failed within a minute of running Prime95.

CPU @ 3.8 GHz - NB Stock CnQ Enabled:
Image Editing: 1226
Video Encoding: 1859
Multitasking: 1132
Overall: 1406

QuietIce · Mar 26, 2010

gcwebbyuk said:
I have just run some benchmarks using Custom PC Magazine Benchmark Suite and compared them to my results with the NB oc'd as well - not much in it strangely!

CPU @ 3.7GHz - NB @ 2.4GHz:
Image Editing: 1137
Video Encoding: 1852
Multitasking: 1100
Overall: 1368

CPU @ 3.7 GHz - NB Stock CnQ Enabled:
Image Editing: 1195
Video Encoding: 1790
Multitasking: 1119
Overall: 1368

CPU @ 3.6GHz - NB @ 2.4GHz:
Image Editing: 1118
Video Encoding: 1808
Multitasking: 1100
Overall: 1342

CPU @ 3.6 GHz - NB Stock CnQ Enabled:
Image Editing: 1166
Video Encoding: 1751
Multitasking: 1094
Overall: 1337

The CnQ benchmarks were started with the CPU in low multiplier/low voltage mode, so they include the lag to switch to full speed too.

I was able to push the CPU up to 3.8GHz to run the test, but it failed within a minute of running Prime95.

CPU @ 3.8 GHz - NB Stock CnQ Enabled:
Image Editing: 1226
Video Encoding: 1859
Multitasking: 1132
Overall: 1406

The editing and encoding numbers reflect about a 5% difference in performance, which is more than I expected, but high RAM and L3 use is where a higher NB speed really shines. I suspect SETI and Folding would see similar increases in performance if not better ...

gcwebbyuk · Mar 26, 2010

My main uses of the pc are Office applications, web surfing, watching films, listening to music and occasionally playing games. So I am pretty happy with the way it seems to work with AOD.

Will do some lightwave and cyberbench tests tomorrow and see how they compare.

Am hoping the PC will feel even quicker next week when I fit my SSD

965 C2 - 3.7 with stock NB

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