Originally Posted by 99belle99
Mine was 200 bclk with 21 multi for 4.2GHz with 1.3volts. by 8 multi for memory to run at 1600MHz, Uncore 16 multi for 3200MHz. QPI speed was 7200. QPI/vtt 1.235volts. My RAM voltage was 1.64v due to being old RAM to run at 1600MHz with timings 7-8-7-20 1T tRFC=50. Power saves were all enabled with turbo turned off inside where you enable turbo. and everything else auto in other parts of bios.
Ran like that for a few years 100% stable.
You would benefit from higher uncore for more bandwidth. Running it at 3.7Ghz for years with no issues.
As for CPU, beyond 4Ghz it usually requires exponentially more voltage and you won't really notice a difference between 4 and say 4.4Ghz as it's only 10%.
Xeon X5650 @ 4.0Ghz | Gigabyte EX58-EXTREME | Tactical DDR3 TC 12GB @ 2200Mhz 10-10-10-26 1T | 3.74Ghz Uncore