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965BE @ 4ghz Need help with next step!

post #1 of 4
Thread Starter 
Hello Overclock community first time poster here and looking for some pointers and help with finishing the OC for a AMD 965 Black Ed C3 processor.

My current rig set up is as follows;

MOBO - Asus m48A7td Evo - Latest bios flashed Ver 2001
CPU - AMD 965BE C3
CPU/COOLER- Coolermaster 212 / Artic thermal compound
RAM - Corsair Vengeance 16g 1600 DDR3 (2X8gig)
VCARD - R9 270x
CASE - CM 922 HAF case with 3 Fans
POWER - Corsair TX 650W

Current OC Profile is
CPU Multi = 16.0 ( 4-16) @ 4.013.10Mhz
VCORE = 1.4879
Bus Speed = 250.82
HT Link = 2000 AUTO
CPU / NB = 2000 AUTO
NB Volt - AUTO
HT Link Volt = AUTO
RAM = 668 X 2
10/10/10/27/26/2T Timings.

I have multiple guides in regards to OC the 965BE and all of them have certain topics that just dont agree with each other

Example is LLC, tons of people swear by it, some dont, some say it disabled helps to get the OC stable. From what Ive gathered with this chipset, is the asus m48a7td has a huge VDROP issue, I literally cant even boot into OS without the LLC enabled. Ive tried, everything. One of my main concerns is that the little hot head bastard needs that 1.487 volts added to complete a stable Small FFT test in prime95, temps stay under 57c with full load blown at it and theres no crash, the voltage does reach 1.512 tho, which I am not very enthused about. Always monitor your Temps and they are still under 57 with 43 Prime95 Iddle.

Second concern would be that my CPU/NB is still not touched, I have read ALL the guides and they all DO agree that this does play an important roll in the Deneb 965BE Oc. I have tried raising slowly and adding small volt bumps but NADA, all crashes. Wich take me to my 3rd concern, MEMORY.

Regardless of test on PRIME and completing Small FFT tests, the Blend test that incorporates RAM testing, crashes fairly quickly. Currently I downed my ram speed to 1033 from 1600 and loosen the timings to help achieve the OC of 4ghz. One thing I have noticed is that my cpu does enjoy the FSB and Multi combo OC more than just upping the multiplier by itself, also it loves VCORE volt like crack addict, dont worry temps are still under 57c!!!!

Well thank you for listening to the ramblings of a new OCer and would greatly appreciate any feedback and help biggrin.gif Thank you!
post #2 of 4
You got it right about the V-core. It's not un-common for Phenom II to be running 1.55v or even more. I had quite a few chips that just simply loved 1.6-1.65v and would nicely run 4.2-4.4ghz daily.

I'd say you are about at the limit for cooling and voltage mix. I was running a decent custom loop to achieve 4.4ghz.

A good go at this now since you have just about top CPU speed, is to back down the CPU multiplier and start a little reference clocking. You'll get decent RAM dividers at 225, 250, 275 and 300 bus clocks.

The NB and HT you can leave linked. I've seen quite a few system run up to 3ghz NB/HT speeds for a daily. Will require some CPU/NB voltage increase, 1.35v is a good starting point once you get up to that 2500mhz mark and faster. The HT you can probably use up to 1.3v. All this you should increase in small increments and do some stability testing along the way.

memory you should aim between 1600 and 1866 (800-933mhz). With all these added tweaks, you'll have a more responsive system with a CPU clock speed between 3.8 and 4.0ghz.

The best way to approach overclocking, is to concentrate one one thing at a time. If you are working on Memory for example, you leave the CPU, NB and HT at lower stable speeds to find the memory cap. If you can't get much past 1600mhz with stock voltage, you gotta bump that Memory voltage up some. If stock is 1.55, you can safely run 1.65v.

Also, for safe measure, actively cool the VRMs, Memory and NB with fans. It'll help keep system temps down while over-volting and clocking up.

NB Volt - AUTO

By the way, this voltage is NB core or Chipset voltage. This needs to be increased with CPU/NB to achieve NB overclock.
Corsair Vengeance 16g 1600 DDR3 (2X8gig)

Would like to see full specs for this ram too please.
Edited by ShrimpBrime - 2/29/16 at 9:37pm
post #3 of 4
Thread Starter 
Hello Shrimp Brime! Thanks for the quick response, By NB VOLT I meant to say CPU/NB Voltage, since I did not touch any of those speeds I left it on AUTO.

Also here at the RAM Specs

16GB (2 x 8GB)
240-Pin DDR3 SDRAM
DDR3 1600 (PC3 12800)
Cas Latency
Multi-channel Kit
Dual Channel Kit
16GB (2 x 8GB) DDR3 for AMD and Intel Dual Channel processors
9-9-9-24 latency
Intel XMP 1.3 (Extreme Memory Profile) Support

My goal with this thread is to successfully get the rest of the board and components up to par with the cpu running at the 4ghz. I understand CPU/NB needs to be addressed, also my RAM , See you say a higher clock of RAM would go better? Everywhere Ive read they recommend a lower setting 1333, and tighter timings go way better with the 965BE.
post #4 of 4
You are correct. Let's say you lower the RAM divider (1600 to 1333) and lower the CPU multiplier. Then you overclock the bus frequency and get the ram running back at 1600 again. It's true you want tighter timings.

So just for a heads up, any decent overclocking RAM will do 1600 (800mhz effective) with timings of 8-8-8-24-32. While tweaking memory timings, you may need to add RAM voltage to do this.

To explain CPU/NB voltage, this is the on die memory controller voltage. This should help with overclocking your Memory.

Any how, back when I was overclocking Phenom II, I had a nice set of Mushkin RedLine memory. Would do 1600mhz at 8-8-8-24-32 / 933mhz at 9-10-9-27-36 and with the 9-10-9 timing set would easily do 1000mhz stable with 1.65v it's stock volt rating.

So there's a couple of ways to tackle this. One is to over-volt the memory you have to 1.65v and use the bus clocks to try and get closer to 933mhz with the 9-9-9 timing set you have. OR you can try tightening the timings at 1333 and see if it'll boot 8-8-8 timings and run 1.65v, use the bus clocks to try and reach 1600mhz.

If you have trouble at CAS 8, you could try something like Cas 9-8-7-24-36 with 2T Command Rate.

In a nut shell, it takes quite a bit of trial and error to figure out how to tweak your particular memory as it differs from any memory I've overclocked. Typically for Phenom II and FX processors, 1866 memory fairs pretty well for overclocking and tweaking. Some Phenom Processors such as the 1090T, 1100T, 960T have a somewhat better memory controller than the Phenom II 955, 965BE for example. I've overclocked every one of these listed with the Mushkin RedLine I mentioned above and was able to run 800mhz daily 8-8-8-24-32. It seemed to be a sweet spot. Also had them running at Cas 5 between 500-600mhz too.

If you are trying to run daily clocks, I'd try for that 800mhz at Cas 8. NB/HT linked around 2600mhz, more than this will be not so noticeable. You do have some tweaking work ahead of you. And remember if you run into trouble, clear the CMOS and start over. Another note is while overclocking Memory, you can ruin your operating system. So I suggest you set up a partition to practice overclocking with so you don't loose important data.
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