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MSI 6950 TFIII PE/OC- testing w/ CL3P20 - Page 2

post #11 of 98
Quote:
Originally Posted by CL3P20;13425268 
**off topic- the Ballistix I got for the mem comp are a total bust.. sozo.gif high density..single sided..and giving me issues in every way! frown.gif
Same boat here, the new t2rs+ I got is a complete dud, posts fine but can't get over 560 fsb through setfsb, boot at 500 max.. Not sure wth is up with it.
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post #12 of 98
Thread Starter 
continued post:


For starters, I want to draw some attention to the GPU VTT phases and supply area on the PCB. Please keep in mind, I am adjusting all voltages on the GPU..and monitoring them under idle and load. wink.gif

P1070741-Copy.jpg
P1070745-Copy.jpg
P1070753-Copy.jpg


VTT and vMEM have droop.. noticeable at high clock speeds. For the 12v input VTT phase, +1ghz core speeds will cause droop -.25v to -.29v. For memory, it took 1410mhz to see the same level of droop occur on the 12v input phase.

Now these figures are all using a TX650 PSU still..which I have already stated, is dipping to 11.81v under load with max clocks on air. I intend to revisit these findings once the GPU is fed with the TPQ1.2kW, to see if the droop issue goes with the PSU or not. smile.gif


Now.. for a quick temp check/comparison from stock air->my water loop wink.gif
P1070754.jpg
P1070757.jpg


More to come shortly...
post #13 of 98
how do you find vtt on card what values can I look for???
    
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post #14 of 98
Thread Starter 
measure points are here..

P1070741-Copy.jpg

Stock vmem is 1.6v idle
Stock vtt is 1.15v idle
post #15 of 98
You didn't post a vMEM mod in the OP, just the OCP pic. You able to change the vMEM via software?
    
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post #16 of 98
Thread Starter 
Quote:
Originally Posted by PizzaMan;13485364 
You didn't post a vMEM mod in the OP, just the OCP pic. You able to change the vMEM via software?

thumb.gif yessir.. You can set mem voltage in AfterBurner.. I havent found a need to go beyond the +4mv limit its giving me yet..may be needed for 1500> ..although cold may do it too.

I am still hitting voltage limitations on the TFIII, so I havent gotten around to seeing if this one will tolerate -0 or not yet. Looks like a Frequency Switching mod is in order..I think Im at some-sort of 'supply limit' with clock speeds +1070mhz. There are virtually no gains in 3d testing over this speed, even though the gpu finishes the benchmark, with no arties. headscratch.gif ...still working on this mod though, just located it and started testing recently.



Voltages on the GPU using TPQ1200 [using 1050mhz core/ 1370mhz mem]:

+12v input for GPUv- 12.02v idle, 11.99-12.00v load
+12v input for VTTv- 12.0v idle, 11.97v load
+12v input for vMEM- 12.02v idle, 11.97v load

GPUv= 1.32v idle, 1.33v load [fluctuation measured at the input to the inductors/mosfet output = -.2v under load] thumb.gif
VTTv= 1.17v idle, 1.17v load
vMEM= 1.62v idle, 1.61v load


Voltages on the GPU using TX650w [using 1050mhz core/ 1370mhz mem]:

+12v input for GPUv- 11.97v idle, 11.91-11.94v load
+12v input for VTTv- 11.94v idle, 11.89v load
+12v input for vMEM- 11.95v idle, 11.90v load

GPUv= 1.32v idle, 1.33v load [fluctuation measured at the input to the inductors/mosfet output = -.6v under load] eek.gif
VTTv= 1.17v idle, 1.17v load
vMEM= 1.62v idle, 1.61v load


The low +12v inputs from the overloaded TX650 caused a LOT of squeal on the GPU's power circuitry.. I was convinced I was going to blow something if I tried to push clock speeds further. On the TPQ1200 - there was NO noise from the power circuitry on the GPU at ALL! IT WAS DEAD QUIET AT FULL LOAD!

I would really like to see if I can get this GPU over 1100mhz now..im just around the corner now, and temps are still under 46c load on water..even at 1.38v and 1080mhz core ..so I am hopeful.


More to come
post #17 of 98
This is looking good. All these numbers are great. And people think a 650w or similar is more than enough for any single card solution.
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post #18 of 98
Thread Starter 
Yeah..from what I see..its enough to use the 650W, when OC'ing this card to ~900mhz core.. but amperage demands on the +12v rail are brutal above this point, and you really need a strong PSU to keep the GPU fed and quiet. wink.gif

* could game on the TX650 with this card at stock all year long.. but with heavy OC..its a different story altogether.
post #19 of 98
I wanted to get the 6950 DirectCUII because most people said it overclocks better than the Twin Frozr III.
But unlockprobability is lower.
And after I saw this I am back on TWFIII:D

Also a full unlock of the Twin Frozr III is interesting ...I will definately come back at you when I got mine^^
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post #20 of 98
Thread Starter 
Performing GPUv mod and experimenting with 'switching frequency' mod as well [penciling only for now wink.gif]. Updates to come as soon as I make some headway. I would like to bench +1100mhz core, which will not be possible without these mods from what I am seeing.

Unfortunately I cannot find any records/posts of a Switching Freq. mod for this uP controller..but I have located the pin/resistor for the mod with a datasheet. The datasheet does not detail if raising or lowering resistance is required to raise the switching frequency.. so looks like lots of testing is in order. redface.gif

->Still trying to locate a 6970 Lightning BIOS to try for a full unlock as well.. *hint*hint*


More to come soon-
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