Question 8pin CPU connector expected resistance?

[fiRe_p0weR]

I had some bent CPU socket pins and after i've done some twisting i measured the +/- of the 8pin CPU connector to check for short and i get 8k Ohms of resistance, knowing the CPU operates with 1-12V doing some calculations i get 18mW per + pin, 4 pins X 18mW = 72mW wich seems insufficient to me (but hey what do i know lol..). So im asking - what is the expected resistance ? I have a Z170I mobo with Intel I7-6700K if it matters, bare in mind - measurments taken WITH the CPU IN the socket. Anything im missing ? How much Ohms should i expect ? Thanks in advance! Great community, helped me atleast a thousend times! ^^

 

[vov4ik_il]

There is no constant resistance on the CPU Vcc pins (to Vss), it all depends on current instruction being executed... Vcc is much (MUCH MUCH) lower than 12v too and so there would be no direct connection between 12v PSU and the CPU socket except for Vdd should be common ground, otherwise there is a whole PWM Buck circuit in between (VRM). I am not quite sure what are you trying to achieve by measuring and how do you actually measure.... but here are some pinouts for LGA1151. If you shed some light on what is the purpose you might get some advice.

 

[fiRe_p0weR]

There is no constant resistance on the CPU Vcc pins (to Vss), it all depends on current instruction being executed... Vcc is much (MUCH MUCH) lower than 12v too and so there would be no direct connection between 12v PSU and the CPU socket except for Vdd should be common ground, otherwise there is a whole PWM Buck circuit in between (VRM). I am not quite sure what are you trying to achieve by measuring and how do you actually measure.... but here are some pinouts for LGA1151. If you shed some light on what is the purpose you might get some advice.

Thank you very much for the insight, i completely forgot the old times desoldering 6V/2500uF caps from CPU area (the Buck circuit ur talking about), anyways as i mentioned above i had an accident with some bent CPU socket pins (no idea how.. i've done this a thousend times, i even had a CPU explode {yes litteraly} once {it was way back when PSUs didnt have short protection lmfao}). So after i finished "UN"bending the bent pins i thought i'd check for near zero resistance (short circuit) and i thought the way to do it is using my multimeter sticking the probes to the negative/positive pins of the CPU 8 pin connector, isnt that the right way to do so ? :O

P.S. The point of this excersise is to check for two pins touching each other (short circuit), BEFORE turning the power on... obviously :> 😛

 

[vov4ik_il]

i'd check for near zero resistance (short circuit)

Did you measure the resistance value you are looking for on the CPU? What is near zero? 100 milli-Ohm? 10? 1? What about other components? Decoupling capacitor array? Did you factor those in? It is a moot point if you do not know the value you are after.
Otherwise, just give you an idea, a 65 watt cpu with Vcc of 0.8v should go as low as 0.009846 ohm (Ω) to achieve 80+ amps on average with 200 amp spikes, you must have a very sensitive ohm meter to get the readings you need 🙂

and i thought the way to do it is using my multimeter sticking the probes to the negative/positive pins of the CPU 8 pin connector, isnt that the right way to do so ? :O

No. It is not the right way. You have a whole complex multi-phase switching power supply with feedback (150+ components in VRM) between the 12v and the CPU Vcc/Vss that converts 12v to high-current low-voltage Vcc to feed the CPU during continuously changing load.
If you want to probe Vcc, you should be looking for VRM Vcc output instead, before and after inserting the CPU into the socket. Decoupling capacitors are sitting on Vcc bus too (those tiny caps in the center of the socket on your picture, and on the backside of the board in the same area), so they are good test points if even. But again, the values you need to check could be waaaaaay below error margin of a common multimeter.

P.S. The point of this excersise is to check for two pins touching each other (short circuit), BEFORE turning the power on... obviously :> 😛

Did you identify the CPU legs those damaged pins are supposed to connect to? Are they all power inputs? If not, it defeats your test purpose. It could be PCI Express lanes, Memory controller lanes, or anything else.
You do understand that your tinkering can (potentially) damage otherwise good components, such as PCIe slot cards, memory modules, and the CPU itself?