Originally Posted by Durquavian That's cause CPU/NB is the NB everyone is talking about.
I know that just mentioned since there was no selection to change the NB, not CPU-NB, then I would and did have to use FSB to get NB to 2600 to match HT and CPU-NB. Was just pointing that out is all.
Ok, I think we have a huge misunderstanding here.
The NorthBridge, as it works on AMD motherboards, does three things.
1) IOMMU support for virtual addressing of PCI-e devices, allowing PCI-e Passthrough. (all 900-series chipsets, and 890FX chipset)
2) Connect to HyperTransport.
3) Connect to the PCI-e devices/lanes/Southbridge.
That's it. It's a massive and insanely fast version of a Networking Switch. You can not change the speed of the NorthBridge itself using FSB, it is not on the CPU, and is not bound to the clock rates of the chip. The only speeds you can modify on it are PCI-e speed, and HT link speed.
CPU-NB on the other hand is the bridge that connects HyperTransport (Goes to NorthBridge), the IMC (goes to RAM), and Cache (Goes to lower cache/CPU) All of these components are on the chip itself, and thus all of these components are
affected by the FSB.