Quote Originally Posted by JumpingJack View Post
There is nothing weird or funny about this, pretty much expected. QPI in a single socket desktop is now simply servicing the chipset which acts as nothing more than a multiprotocol network switch, shuttling to different IO standards, USB, SATA, etc. there is not part of this that is critical in the computational equation to performance overall -- the QPI link will service higher BW than any periphrial will yield, hence ... 25.6 GB/sec or 12. GB/sec (lower QPI BW) will have little to no overall effect, considering SATA can do 300 MB/sec... QPI will neither speed up nor slow down a HD transfer, for example.... this is just intuitive.
USB, SATA, etc. are connected to the ICH10. The ICH10 is connected to X58 via a DMI link. So whatever you plug into any USB or SATA will have the limitation of the DMI link, which is much slower than the QPI. Raising the QPI speed won't make any differencies for pheripherals. You don't need more for that anyways.