QPI PLL a lot of boards do not have... when they do have it and it is not called QPI PLL it is called IOH VCCA 1.1v
IOH/ICH IO voltage is PCIE voltage. Some baords like EVGA link them. Some split it up as IOH PCIE and ICH pcie and some only offer IOH PCIE.
Sucks not everyone uses the QPI PLL because for me that had the greatest impact on BCLKing in my n00bish experience. (Then again the R3F didnt really need it, it would run up to 220BCLK on all auto settings :S) Higher it probably was needed.. I managed to hit an unstable 237 on it. But really anything past 222ish was unbenchable.
QPI slow link mode is only a good idea for CPUZ or if it allows you to jump to 5GHz. It seemed to have about a 7-8% impact on performance when I was trying the superpi 8M challenge a while back. (went from 1'30" to 1'35" IIRC). Try it I keep seeing people recommending it, but there must be something else to it then just enabling it.
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