ive been overclocking for a while, about 5-6 years and read a lot and a lot of information on overclocking, voltages, theories and ive only ever once tryed to find my base clock, its just not that important and its also pretty rare that you will get your processor to run that fast anyway. the Base Clock on my EVGA X58 Classy (sig rig and only time ive wanted to know my base clock) is 260 give or take depending on ambient temps. But i also know that since i dont overclock with L2N, and water cooling is extreme as im comfortable with i wont make use of the 260 base clock.
What i do believe is important is finding the lowest voltage your processor will run at and work up from there.
but a few tips would be that all i7's prefer to run on a odd multiplier (19, 21, 23 ect) were as your i7 950 runs on a even multiplier and will need far far more voltage to keep stable. so you have two options, either back down from 22 to 21, or if your board has turbo mode that locks all cores into 23x then use that. then from there i would start lowering your voltage one bump at a time ( so say your at 1.1750v CPU Vcore you would lower it one option down which would most likely be 1.1525v or something close) and test for stability with Intel Burn Test running Max stress, 8 Theads (make sure you set the threads, auto can cause errors) and 5 laps. if you pass then lower the voltage again and test. continue this until you fail then bump voltage back up one to be stable. then i would use Intel Burn Test at max stress, 8 threads and set the laps to something crazy like 800 and let it run for 24 hours (you could use prime 95 if you wish, but Intel Burn Test makes more heat). This is called burning in, some people swear by it, some people think its bs, personally ive done it with every processor ive had and ive seen some impressive results.
if your like me, and when you lower your Vcore you get to the lowest voltage your bios offers and your still stable start increasing your BCLK untill you are unstable, back down to last stable setting then do the burn in.
after that your ready to overclock. start increasing your BCLK by 2 points, each time running 5 laps of Intel Burn Test, do this until you become unstable then increase Vcore one bump at a time untill you become stable again then continue increasing BCLK. do this until your processor cores are at 74*C and you have found your max 24/7 overclock. you can continue to go higher if you wish but doing so may cause damage, 74*C core is intels specified safe temp for i7's.
this is my method for overclocking, it takes a fair amount of time, and you may want to just rush through, but this method is full proof and will allow you to find a stable overclock without guessing voltages.
a few pointers, the max voltage for your board and cpu areas are:
CPU Vcore: 1.3750v (you can however go to 1.4250v and not really be worried, 1.3750v is intels specified max voltage)
CPU VTT: 1.4000v (or +250mv depending on your board)
CPU PLL: 1.8800v (you dont really need to touch this, and is really a fine tuning voltage, some times like my board lowering the voltage actually improves overclock, so for most users leave at 1.8000v)
IOH PLL: 1.8800v (same as CPU PLL, most users leave at 1.8000v)
QPI PLL: 1.3500v (this is your "Northbridge" voltage, normally the stock voltage is fine, but as a rule you would increase to 1.2500v at BCLK 180, 1.2750v at BCLK 200, 1.3000v at BCLK 220 and so on)
DRAM V: 1.6500v (no more than this, going over 1.6500v can damage or kill the IMC or Internal Memory Controller, meaning bye bye i7)
All other voltages can be left on auto, they dont affect overclocking.
Also there is a DRAM Multiplier and Uncore Multiplier.
DRAM Multi: This sets the ram multiplier and changes the speed in which your ram runs at in respect to BCLK
Uncore Multi: This is your QPI multiplier and much like your CPU multiplier it increases the speed of your QPI (Northbridge)
AT ALL TIMES YOUR UNCORE MULTIPLIER MUST BE 2 TIMES GREATER THAN YOUR DRAM MULTIPLIER! THIS IS VITAL OR IT WILL KILL YOUR I7!
For Example at stock settings your DRAM Multiplier is 8x, there for your Uncore Multiplier is 16x.