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Why can x6 processors OC the NB much more than x4

post #1 of 21
Thread Starter 
Isn't the NB located on the mobo? What does having a diff processor change that allows 3000mhz + NB oc's?
post #2 of 21
I think it's the CPU-NB that can be overclocked higher which is the memory controller thats integrated into the CPU.
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post #3 of 21
Yeah the CPU-NB is the memory controller in the CPU
post #4 of 21
Quote:
Originally Posted by toX0rz View Post
I think it's the CPU-NB that can be overclocked higher which is the memory controller thats integrated into the CPU.
What he said.
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post #5 of 21
Yes, the memory controller (IMC) on the processor is what you're overclocking. That's what the "NB" is on the AMD chips.

The ACTUAL Northbridge on the motherboard is just for the HT Bus.
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post #6 of 21
Thread Starter 
lol oop my bad
post #7 of 21
And the reason for that is the IMC is much better on the X6 CPUs

Even better the AMD cpus benefit more (IMO) from the CPU-NB being overclocked, with my processor at 4.5ghz and CPU-NB on 2000mhz there is much less of an improvement that with my CPU at standard and my CPU-NB at 3000mhz - Feels a lot more snappy.

    
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post #8 of 21
Quote:
Originally Posted by paulharrison123 View Post
And the reason for that is the IMC is much better on the X6 CPUs

Even better the AMD cpus benefit more (IMO) from the CPU-NB being overclocked, with my processor at 4.5ghz and CPU-NB on 2000mhz there is much less of an improvement that with my CPU at standard and my CPU-NB at 3000mhz - Feels a lot more snappy.

Overclocking the IMC does tend to give the most performance boost, yes. This is why the older K8 dual cores can sometimes beat out the Phenom II chips (with DDR2 boards). The NB was actually operating at the same speed as the CPU was on K8.

So yes, overclocking the NB is the best place to start. The higher, the better. Increasing CPU-NB voltage as needed (up to 1.45v).
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post #9 of 21
Quote:
Originally Posted by pioneerisloud View Post
Overclocking the IMC does tend to give the most performance boost, yes. This is why the older K8 dual cores can sometimes beat out the Phenom II chips (with DDR2 boards). The NB was actually operating at the same speed as the CPU was on K8.

So yes, overclocking the NB is the best place to start. The higher, the better. Increasing CPU-NB voltage as needed (up to 1.45v).
I thought 1.45v was okay until recently I found that it was kind of high. I'm using 1.3V for 2800MHz right now.
    
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post #10 of 21
Quote:
Originally Posted by listen to remix View Post
I thought 1.45v was okay until recently I found that it was kind of high. I'm using 1.3V for 2800MHz right now.
I agree and same voltage here: 1.3 for 2800 Mhz.
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