What does the red wire mean :confused:
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What does the red wire mean :confused:
Quote:
Originally Posted by Weee
The red wire was drawn to show what point the person actually soldered to in the photo Kazoo showedQuote:
Originally Posted by ViperJohn
I ended up soldering where my little red wire is shown, since I lost the first pad when my pot ripped off when I went to turn it =\, and then that leaves the one Kazoo showed floating, leaving only direct hit to the SMD
Hey i was thinking i should make a switch into my fan controller to turn the vmods on or off, but i doubt it's a good idea to put long leads and a switch between the resistor and ground.
Is there any good way to do this.. Opto coupler maybe? Never used them before but i think that might be what i'm looking for.. Any thoughts? Thanks
You are correct it is a bad idea.Quote:
Originally Posted by Gogar
Viper
There has to be a way though, does this look like it may be a decent solution?
http://www.gogar.com/vmodswitch.png
Some page about optocouplers says thishttp://homepages.which.net/~paul.hil...rol/Optos.htmlQuote:
However much electrical noise is on one side, it can never be transmitted over to the other side.
I'd say just take the few extra seconds to turn your pots all the way to the maximum resistance/lowest voltage values which are close enough to nominal that I'd say they are "safe" but that's just me
It really isn't needed especially on a 6800/7800 card. When you are in 2D mode the Vcore drops .200 volts without mods. If you were running modded with 1.650 Vcore in HP3D mode that would be about 1.410 or so in 2D mode with virtually no load on the GPU so very little heat rise. A stock 7800 runs 1.40 -1.410 Vcore in HP3D mode with a lot of GPU load and heat so wthat are you worried about lol.Quote:
Originally Posted by Gogar
Another issue with instantaneous large changes in Vcore, like when you switch, is in and of itself is hard on the core. You get momemtary current surges (only last a couple of milliseconds but they are still there). The regulator can also under/over shoot and ring with large instantaneous change as well.
Went the drivers switch the VID's to change voltages at mode changes the voltage ramps up and down over several milliseconds by design. When you make sudden changes in the voltage feedback the regulator(s) try to respond and correct immediately.
Never suddenly switch the memory voltages in any case.
Viper
I see.. the instant change thing sounds pretty dangerous indeed. And i dont really have the equipment to go any further. I guess i'll first just see how the vmod goes and what the heat output is in normal use, i just like my stuff to run quiet at night you know ;)
When a new VID is presented at the VID pins, does the voltage change immediately or is some kind of trigger required to initiate the ramp to a new voltage?
Thanks!
I Did the vmod, vcore, and also the vdd mod. But the vdd mod came off. With a tiny piece of pcb. I can't solder it back! The card works perfect, 580-590 core @ 1,58v.
Is there an other way to do the vdd mod?
edit: This one came off:
http://www.utforce.info/mod.jpg
try rosin to clean the surface first and resolder it
will the vgpu mod work on the 7800 GTX 512 MB "Ultra" ?
Generally when the voltages are changed using the VID's pin the voltage will ramp (Slew) up or down over time. The slew rate is just "X" volt change over "Y" amount of time. It can be designed into the regulator or set (programmed if you will) by the regulators supporting component values.Quote:
Originally Posted by Gogar
The regulation feedback ciruit on the other hand is designed to deal with small the changes in PS voltage output caused by load changes in load on the PS. These are dealt with instantaneously, within the response time of the regulator at it's operating sampling frequency, to hold the PS output voltage at a relatively fixed level. There will always be some slew due to the impedance of the PS's final filter circuit but it so minimal compared designed in slew rates for large deliberate changes in PS voltage output using the VID pins, that would could say there is none.
Viper
Probably but won't know until I see the cards PWA as my crystal ball broke a long time ago lol.Quote:
Originally Posted by albertwesker
Viper
Damn, my 7800GTX died when i removed the voltmod, the chip came off....
:( :( :( :shakes: :bsod:
that sucks, i destroyed a 7800gtx a few moths ago, so I know how you fell. sorry
If i do Vmod and then remove it my video will die ?
which chip? :shocked:Quote:
Originally Posted by DesertShooter
The Vgpu mod chip.Quote:
Originally Posted by Victorshen
Not if it is done correctly going both ways. It comes down to the tools you use and the skill you have using them.Quote:
Originally Posted by AC/DC
Viper
I did both mods, Vgpu works fine and Vmem did work fine =(
Was running it 2.4volt on ram yesterday, today when i started the computer and put checked with multimeter it was reading 3.0volt!!
So i killed psu and screwed the resistor down and rebooted.
It started at 2.4 and slowly raised to 2.8 so i killed psu again and cut the cable to voltmod.
It still starts at 2.4 and raise slow to 2.8.
Ram is not very hot but can be runned at insane speed but what can be wrong ?
Platoonsgtelias is happy with 1750mem but i beat him :D
So now i just sit and wait for card to :explode2:
I think you're supposed to buy yourself dinner before doing that. ;) Man - that sucks... is it dead, Jim?Quote:
Originally Posted by cronic
I know what you mean. Thanks budQuote:
Originally Posted by revenant
sorry - a joke in poor taste.. *sigh* anyways, did your card recover from that? I'd be very careful about messing with the pots settings while the card is on.. wow.
Anyways. I just picked up a pair of BFG OC GTXs (256) and am thinking about the vmod action for core and memory... trying to pick the best method for doing this... hrm...
Quote:
Originally Posted by revenant
NOPE I SOLD IT FOR PARTS
I had my iron too hot, took off one of those tiny SMD parts, but I just put it back where I took it from, and everything was okay. even if you lose a part as long as you have a pad to solder to you can usually find the part and replace it.Quote:
Originally Posted by DesertShooter