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Friend asked a question that I actually don't know.

post #1 of 4
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Hello OCN

So basically Friend asked a question that I actually don't know. He asked if you overclock the CPU/NB, is that just the CPU or does it overclocking something on the motherboard aswell?

other question is the Ref clock (the 200 one) is only affected by the CPU right? it's basically not a thing you overclock on the mb?

Thanks
Edited by Speced - 2/19/12 at 9:53pm
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post #2 of 4

Overclocking the cpu/nb overclocks the IMC which is in the cpu. The gains are quite substantial so it's advised that as much as you can while your overclocking.

 

Now when you change the baseclock (the 200) it also increases the cpu/nb, hyperlink, dram and cpu freq (so a little of everything) so make sure you adjust things accordingly.

 

Edited..


Edited by Yumyums - 2/19/12 at 10:45pm
post #3 of 4
Quote:
Originally Posted by Speced View Post

Hello OCN
So basically Friend asked a question that I actually don't know. He asked if you overclock the CPU/NB, is that just the CPU or does it overclocking something on the motherboard aswell?
Thanks

The CPU/NB is NOT on the motherboard, as most people think, in fact it is the memory controller on the CPU die, the IMC (integrated memory controller). It is known as the CPU/NB because this memory controller function used to be delegated to the northbridge chipset on the motherboard. Not exactly sure when, but this function was moved onto the CPU die a while ago. The name just stuck I guess. Now the northbridge on the motherboard controls things such as USB ports etc I believe. You get a performance boost from overclocking the CPU/NB because it lowers memory access times, making the system feel faster. The fact that it is on the die is also the reason you can raise the voltage up to that of the processor voltage. The ACTUAL northbridge (on the mobo) can only go up to like 1.2 volts. An example, on my Gigabyte 990FXA-UD3 motherboard, the official memory supported is 1866, however if you dont have a bulldozer proc,and say, a phenom II instead, then the maximum default speed is only 1333 mhz. This is due to the fact that the default/supported speeds are based on the IMC on the CPU die, and therefore change based on the CPU that is in the socket. Moving things onto the CPu die is the way the industry is going. Ivy bridge procs have the PCIE controller built into the die as well. This is why you see motherboards with PCIE 3.0 support, but they dont have the capability yet, as there are no ivy bridge procs to allow them to test it out. Soon, almost all of the motherboards functions will be right on the CPU die. Hell, even graphics chips are on the CPU die nowadays. Anyway, little off track there but I hope i answered you question! thumb.gif

EDIT: the ref clock is not anything you are overclocking really, it is just a setting that tells your components how fast to run. Kind of like changing your CPU multiplier to overclock. Think of it as setting the cruise control on your car, you are just simply telling the car the speed you want it to go. As above said, the ref clock affects many of speeds in the system as well.
Edited by Shadow_Foxx - 2/19/12 at 10:42pm
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POLARIS
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Red Alert SR-1
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CPUMotherboardGraphicsRAM
Intel 3570k 4.5Ghz 1.25v AsRock z77E-ITX XFX Reference 2GB 6950 1015/1500 1.255v 8gb Gskill Trident X 2400 C10 
Hard DriveCoolingOSMonitor
Samsung 830 128GB Ek Supreme HF White Acetal/EK FC 6970 Windows 7 Dell U2913WM 2560x1080 
PowerCaseMouseAudio
Cooler Master Silent Pro Hybrid 1050w Caselabs Mercury S3 Logitech G500 Fiio E10k USB DAC 
Audio
Creative Aurvana Live! 
CPUMotherboardGraphicsRAM
Phenom II 955 BE (4.4Ghz @1.52v) NB @ 2870 Gigabyte 990FXA-UD3 Rev. 1.1 [F4] Dual Reference XFX 2GB 6950s (950/1437) 1.25v 8GB Gskill DDR3 1333 CL7 @1412 
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post #4 of 4

The motherboard/chipset NB contains the bus clock generator, HyperTransport Links, and PCiE lanes primarily.  Overclocking what is termed as the "CPU-NB" (which is the IMC) increases the throughput capability and the speed of processing/distributing data from the RAM back into the CPU.  Intel has had PCIE on the CPU die (through DMI) since LGA1156 Clarkdale and AMD since the Llano APU.  AMD was actually pushing towards an x86 SoC (system-on-a-chip) as planned with the Krishna and Wichita low end APUs (to compete with Intel Atom, ARM) but those have been delayed for now.  The CPU-NB voltage value actually controls the voltage value for both the IMC and the L3 cache.

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