A little help with Overclocking

[ooogz]

Hello,

I recently got an Asus Sabretooth r2 motherboard and currently have an AmD Phenom 965 C3
Just got my new board so im gonna start Ocing from stock again.

I understand the basics but
Can some one pls explain the difference between CPU/NB Voltage and NB Voltage?
Looking at my board and Cpu what should my Max safe voltage for every day use be on my CPU/NB voltage and NB voltage be?

Ive tried searching on other forums but they have so many posts it gets confusing.

 

[Xander8807]

NB Voltage control is for the NB that is on the motherboard - you don't need to change that, it will likely cause more problems than good.

CPUNB - the NB that is in the CPU (memory controller), the safe voltage is somewhere up to 1.3V but I run it around 1.25V for 2600MHz. Remember that on Phenom II CPU's in order to get maximum performance from overclocking you also need to overclock the CPUNB (most people only overclock the CPU but forget about the NB).
One thing you need to be careful with CPUNB is that it depends on the CPU clock, so for example:
If you have your CPU at 3.5-3.6GHz, you should have the CPU_NB at around 2600MHz, running it at 2800MHz could give you less performance.

 

[ooogz]

Thanks man.
so I got it to 3.8 with 5 hours prime95 stable. I got this on my old motherboard as well. I cant get 3.9 or 4.0 to run 5 mins prime95 even upping the voltage to 1.4625 doesnt help.

Any ways when I run prime 95 ,cpuz reports my vcore to be at 1.472v but its set to 1.45v in bios?
Also as u can see in the image cpu/nb voltage i leave on auto. Auto is at 1.350v. Is this safe?

 

[Xander8807]

You can also OC your Ram if you want to , i did it with test rig Mhz was 666 i took it to 997.5 Mhz and it was running stable Stable OC for Ram on average is about 200 - 350 Mhz, if it is low latency gaming ram you can go 400-800 Mhz more(depends on RAM make ofcourse as well as airflow).
And
What was the factory spped on the CPU? because you can still play with the CPU\NB to maximise the response from the CPU.
And vcore auto adjusts in most cases (Depending on BIOS settings) to suit the load, so pre-windows will be less than in windows.
The NB voltage you can work out on a scale (if you have good maths knowledge ) i.o.w. how i worked it out for safe OC'ing is that if you have a factory CPU running at 2.8Ghz with NB V of 1.35 and Vcore at 1.45 you can easily go 3.75Ghz as long as the NB is 1Ghz lower than the speed of the CPU.

tried it numerous times and it works well, my pc i have i will list quick to prove:

case: HAF 932
MOBO: Asrock Fatal1ty Z77 Performance LGA1155 DDR3 SLI / CrossFireX (Ivy Bridge)
CPU: Intel Core i5-3570K Quad-Core 3.4GHz LGA1155 Boxed Processor (Ivy Bridge)
Ram: Team Dark 4x4GB DDR3-1600 1.5v CL9
HDD: 4 x 2Tb WD Green Caviar
Screen: 51" Samsung HD Plasma series 5

CPU
Standard: i5 @ 3.42Ghz
OC: i5 @ 4.63Ghz

RAM
Standard: 4GB DDR3-1600 1.5v
OC: 4GB DDR3-1996 1.7v

Temp:
Idle: 24 C
Running: 34 C
Benchmark 1 Hour: 48 C
benchmark 8 Hour: 59.8 C
Benchmark 2 Days continous: 62.9 C

Cooling: 14 High airflow fans
Power: 2 x thermaltake 500W non-modular PSU

 

[Pada]

@Xander:
If you're pushing your RAM to almost 2GHz, what latencies are you using then?

Also, how are you using 2 PSU's simultaneously? Did you bridge them?

 

[Xander8807]

10-12-10-27 timings (mind you i replaced them 3 times to get the timings right for the speed)
yeah i bought a split to join the 2x24 pin adapters into one plug

 

[Rickster]

Thanks man.
so I got it to 3.8 with 5 hours prime95 stable. I got this on my old motherboard as well. I cant get 3.9 or 4.0 to run 5 mins prime95 even upping the voltage to 1.4625 doesnt help.

Any ways when I run prime 95 ,cpuz reports my vcore to be at 1.472v but its set to 1.45v in bios?
Also as u can see in the image cpu/nb voltage i leave on auto. Auto is at 1.350v. Is this safe?

If you went to the previous menu you should see three Asus settings...choose Asus Optimal and it will auto OC it to safe values...just make sure all OC settings are on Auto.

PS: It boosted my I5 2500k from stock 3.3 to 4.5ghz with no additional settings...but i had to revert back to normal because I have a stock cooler.

Like so:

 

[Xander8807]

that will be the "safe values" that has been allocated by the manufacturer for cpu, but keep in mind that no CPU,Mobo is the same and responds different to OC'ing.
Personally i do it manually and do it good the first time and test and if good i bump up more, still good i take it to the max.

But it is all about preferance