RD890/SB800 - Hydra Engine + independant clocks per core?

[Lightman]

As far as I know ACC is a novel way of clock skewing (it's not a degratory term unlike what shills like to term it), nothing to do with clockgen.


Rage3D had a 790GX article where they said SB700/750 addresses some issues concerning stability, while ACC skewing was added as a side project.

But I've read somewhere that SB750 had integrated clockgen and that's why you can get much more stable OC plus going below zero on SB750 boards is easier due to less coldbug. All that thanks to external clock from SB.

But I might be wrong and info I've heard was about SB800 ...

EDIT:
I found this bit of info:

Now its clock generator is fixed and AMD has bolted on RAID 5 into the mix, AMD now (finally) has a southbridge to match the competition. AMD's USB performance has also been notoriously weak and the company has maintained that this has been improved through SB700 and now SB750. We put this claim to the test very soon.

First Look: AMD 790GX IGP and SB750 AMD 790GX and SB750: What's New?The most interesting feature of the southbridge is its new Advanced Clock Calibration feature. Unfortunately we can only allude as to what this does technically because AMD hasn't yet told us specifics, although from the name we can obviously tell it's a new embedded controller that keeps the clock generators in sync as the clock speeds are changed out of spec when overclocking.

http://www.bit-tech.net/hardware/200...gp-and-sb750/2

It doesn't say what this clockgen is supposed to do. It can be to drive USB clocks, or PCIe, but I doubt it. It's more likely these are driven from motherboard quartz and NB part (maybe expect USB, SATA, IDE). Anyone with experience designing motherboards??