Originally Posted by Liighthead
So capacitors pretty much clean up the volts so its constant instead of spiking?
And yeh when do you know if u need them or not
Yes.. and no..
Caps hold current for quick discharge, so voltage and current stay constant.. YES. ...but they also filter noise out of the circuit..which can ultimately lead to supply issues and unstable voltage as well.
Heres my method for determining what caps to add..
Set GPU clocks at highest stable limit at said voltage.. proceed to test with AA and AF enabled.. I use 3D'06 with full Q features and 1920x1080 res.
While testing - measure and monitor the +12v inputs on the GPU..measure at the PCI-E plug.. measure again at the first set of +12v caps. Note your results.
Repeat the above step- for the GPU output phases now.. measuring first at the inductor coils [both sides of the inductor... very important to have these measurements], then at the first set of GPUv output caps..and again at the back of the GPU core [if a suitable read exists.. it usually does
When done.. do the same process and focus on the vMEM circuit... inputs and outputs.
Now look at your recorded results! Where is the biggest source of change? Where is voltage dipping or drooping the most? Consider a .2v drop through a circuit is "normal" ...anything beyond this needs improvement.
**The readings you take of the inductors are VERY important as this is often the best way to check for poor input supply.
ie- if voltage at the "input side" of the inductor coil reads 1.36v ... and the "output side" of the inductor coil reads 1.3... I will be adding +12v caps.
Changing inductors is probably the easiest way to prep a GPU for extreme use.. as it will help more than anything else, once you start approaching the limits of the power phases and capacitance on the PCB. Just examine the #'s on the inductor coil..and replace it with a larger value inductor. This step alone can bring +.5v to a GPU at the same GPUv setting..and push OCP up farther in the voltage range.