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vMOD Gallery: if its mod'd...it belongs here - Page 44

post #431 of 553
Thread Starter 
Quote:
Originally Posted by mAlkAv!An View Post
Have you tried to add caps very close to GPU or VRAM to existing MLCCs?
From my experience doubleing the big solid caps gives less profit.
I did.. so long as I have caps on the output phases.. I can run +1200mhz core. Without them, gpu is not stable beyond 1140mhz or so. My issue with moving the caps, is that I need space for mounting and bolt-down for the my pot.

I may try adding some 2.5v solid caps on the MLC's behind the core, so long as i can still figure out a way to mount the GPU to a pot.

*At this point Im just trying to stabilize the GPUv a bit more.. this PCB is too tight for me to add 2ndary inductors, or swap the stock ones .. ...I feel thats what it really needs.


@ bass- the 4890 layout is similar tot he 5870.. the 1x I did for Patch was really good.. pics below of added caps. Both SMD/MLCC & solid caps used.



post #432 of 553
Only needed four caps? Are there some on the back?
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post #433 of 553
Thread Starter 
vdd & vddq = orange and yellow
gpuv = red
+12v input = purple




*backside looks great for input caps.. you can do GPUv on the backside as well.. mem caps need to be on the front though.. little tight.
post #434 of 553
These are the caps I have to work with... any of them stand out?

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post #435 of 553
Thread Starter 
CER = ceramic... very fast discharge
TAN = tantalum... fast discharge, lots of uF in a small package

..thats about all I can tell off the listed numbers. I dont know if Cer/Tan caps are going to be nice to land where you need to though.. you most likely just want some standard 'can' type caps.. solid or non-solid shouldnt matter, as your far enough away from the core, that you shouldnt have to worry about the caps freezing.

*see if you can find something in the +800uf range, in a electrolytic cap.. 16v of course.
post #436 of 553
That's all we have... maybe I can pull something off a boneyard PC.

Would the caps off an old HP/Dell be decent enough or this there some sort of hierarchy of capacitor quality?
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post #437 of 553
Thread Starter 
There is definitely a difference between quality caps and the cheapos used in OEM mobo's.. mostly in the quality of the ripple or ESR rating [which is the "filtering" ability of the capacitor, for smoothing current fluctuations].

*Only thing is- your GPU may only need additional voltage supply for stability..and not additional filtering for current ripple. Unfortunately unless you have an Oscope and are a freakin elect. major.. the only way to tell is by testing different caps and their ratings/impact on the voltage and circuit.

I can tell you from my own experience, that just going from 4x 2.5v, 820uf caps -> 2x 2.5's and 2x 6.3v, 1800uf caps.. I gained ~40mhz of stable bench speed, and was able to lower voltage from 1.38 to 1.35v. The larger voltage cap, helped in smoothing ripple in the voltage supply a lot more is seems..even though the smaller 2.5v solid caps have a much better ESR rating than the 6.3v electrolytic caps I changed to.

^^^For this GPU.. more capacitance was all that was needed for higher clocks.
post #438 of 553
2.5V caps instead of 16V?
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post #439 of 553
Thread Starter 
Quote:
Originally Posted by xxbassplayerxx View Post
2.5V caps instead of 16V?
No.. that was an example.. I was talking about caps on the GPUv phases there.. for input phases you always need more than 12v.. so 16v is usually what is used.

GPUv and mem caps for output = 2.5, 4, 6.3v ..i look for +600uf as a min.
+12v input caps = 16v ..i look for +800uf as a min.
post #440 of 553
8800GTX, vGPU, Vmem and read wires.

gotta love that eraser!

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