i go mad, i'm thinking of trying your mod and adapt it on a GF 4 Ti 4200 for fun
but i will wait until we found a way to have better output over 1.5V
i go mad, i'm thinking of trying your mod and adapt it on a GF 4 Ti 4200 for fun
but i will wait until we found a way to have better output over 1.5V
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Last edited by OnLine; 01-19-2005 at 06:29 AM.
s754 PCIe; EPoX EP-8NPAJ // Claw 3700+ // 7800GTX // Cors BH-5 1GB // OCZ 520W // WinXP
Just remember, this isn't a core voltage mod, it's a power mod and should be used only if You got the feeling your cards on-board voltage regulators can't provide enough juice/power.Originally Posted by Del Gro Badeu
i go mad, i'm thinking of trying your mod and adapt it on a GF 4 Ti 4200 for fun
but i will wait until we found a way to have better output over 1.5V
But it's a good idea to try it first on a cheap spare VC, to see if the circuit actually works.
I's easy to make a mistake.
Very easy ...
s754 PCIe; EPoX EP-8NPAJ // Claw 3700+ // 7800GTX // Cors BH-5 1GB // OCZ 520W // WinXP
I don't know what your looking for but the vmods for the 6800u and GT are already done by Lardarse. The vgpu mod is in the vrzone article and works for both ultra and GT cards. I don't know about the vmem mod, but lard did one and it worked. If you ask him nicely I'm sure he'll help you out.
Lardarse we ask you to share with us
Winchester 3k+:MSI Neo2 Plat:HyperX 1GB TCCD:Leadtek 6800Ultra:LCD 19"
Hey, online, I'm going to do this mod whenever I get the supplies, but what is holding it back do you know? How can it be improved to be allowed over 1.5v. I'd like it to be capable of 1.9v or so, not that I plan to go that high, but it would just give me headroom. I will later put my card under a phase changer, and will certainly be volt modding it to get as much out of it as I can. Great work btw
E8400 @ 3600mhz
4870 @ 790/1100
2x2GB DDR2
I'm using the Asus 6800GT 128MB DDR1 bios and the nibitor does interpret the vcore tables 3rd value as 1.6v but when using rivatuner to monitor the GPU voltage it still remains at 1.5v.
Did you measure the voltage directly with a DM to verify the voltage?
Last edited by stealthbomber; 01-19-2005 at 07:54 AM.
You should check it with a dm, but rivatuner states my voltage as 5.0v so I wouldn't give it too much credit
Edit: Hey, this would work in place of the MJE2955 wouldn't it? http://www.fairchild-direct.com/ds/MT/MTP3055VL.pdf
Last edited by kryptobs2000; 01-19-2005 at 08:08 AM.
E8400 @ 3600mhz
4870 @ 790/1100
2x2GB DDR2
What do you mean Szymek?
They've been out for some time:
http://www.vr-zone.com.sg/?i=926&s=1
http://www.vr-zone.com.sg/?i=1622&s=1
LardArse: i forgot to mention that i was looking for Vddr mod
thanks for the links !!!!
Winchester 3k+:MSI Neo2 Plat:HyperX 1GB TCCD:Leadtek 6800Ultra:LCD 19"
That's cos you ain't configured it properly.You should check it with a dm, but rivatuner states my voltage as 5.0v so I wouldn't give it too much credit
How do I configure it then?
E8400 @ 3600mhz
4870 @ 790/1100
2x2GB DDR2
See attachment...
ok, well I configured it right, and it is displaying mine as 1.3v when it's set to 1.4v, so it's still wrong I think. I have a GT, and I have the 1.1v + 0.2v / 0.3v loop selected, which is what it should be right?
E8400 @ 3600mhz
4870 @ 790/1100
2x2GB DDR2
The VID interpretation can be different for each card brand and 6800LE/NU/GT/Ultra type, the way some utilities such as nibitor used to interpret these values were incorrect, although it has been updated recently (v1.9b?) to properly interpret what the VID table values really represent.
i wasn't aware that you've published the vmod for memory
i will link articles on the first post.
yeah i knowJust remember, this isn't a core voltage mod, it's a power mod and should be used only if You got the feeling your cards on-board voltage regulators can't provide enough juice/power.
But it's a good idea to try it first on a cheap spare VC, to see if the circuit actually works.
I's easy to make a mistake.
Very easy ...
Last edited by Del Gro Badeu; 01-19-2005 at 08:59 AM.
Well I took my card out to look at it, and these resistors are really small, the vddr will be especially hard since you must solder both ends on the same one. I'll give it a go Though I guess lol. Right now no need for the vgpu untill I get some better cooling.
OnLine what are the added caps for on your card, and what are the connected to?
edit: how high is it safe to take the vddr?
Last edited by kryptobs2000; 01-19-2005 at 09:54 AM.
E8400 @ 3600mhz
4870 @ 790/1100
2x2GB DDR2
I believe the load is unbalanced.Hey, online, I'm going to do this mod whenever I get the supplies, but what is holding it back do you know? How can it be improved to be allowed over 1.5v. I'd like it to be capable of 1.9v or so, not that I plan to go that high, but it would just give me headroom. I will later put my card under a phase changer, and will certainly be volt modding it to get as much out of it as I can. Great work btw
The boards voltage regulators / power supply are a different from mine, which makes the current supplied to the core a bit unstable. I'm working on it though.
It's good enough for up to ~ 1.47V [ that is for my card, others may react different ] but that requiers a Bios V-mod of 1.4V to balance the load.
If You set Vout to 1.3V to 1.4V, your Bios must first be modified to use 1.3V core voltage.
If You set Vout to 1.25V [ lowest possible ] to 1.3V [ possibly 1.35V ], your Bios must first be modified to use 1.2V core voltage.
Last edited by OnLine; 01-19-2005 at 10:59 AM.
s754 PCIe; EPoX EP-8NPAJ // Claw 3700+ // 7800GTX // Cors BH-5 1GB // OCZ 520W // WinXP
Nope, that's a n-Channel Power MOSFET, which is driven by voltage.You should check it with a dm, but rivatuner states my voltage as 5.0v so I wouldn't give it too much credit
Edit: Hey, this would work in place of the MJE2955 wouldn't it? http://www.fairchild-direct.com/ds/MT/MTP3055VL.pdf
Power transistors are driven by current.
See if You can find 2N2955 ~ they look different but are the same.
Look in the data-cheat for pin layout [ B C E ].
s754 PCIe; EPoX EP-8NPAJ // Claw 3700+ // 7800GTX // Cors BH-5 1GB // OCZ 520W // WinXP
That's C2, the load caps [ look at the circuit picture ]. It's best to have them soldered on the board because one want Vout(+) stable at that end of the wire. They are connected over existing caps on the board, and one end of those existing caps reads +1.3V [ for GT ] = core voltage, the other reads 0V = ground.
s754 PCIe; EPoX EP-8NPAJ // Claw 3700+ // 7800GTX // Cors BH-5 1GB // OCZ 520W // WinXP
http://www.radioshack.com/product.as...%5Fid=276-1778
Found one at radioshack
edit: Ok, I'm gonna go up to radioshack when I get a chance and pic everything up. Here's what I need, if you don't mind making sure I have everything.
2 MJ2955 Transistor's
1 LM317T Voltage Regulator
1 1k Variable Resistor
1 240 ohm fixed resistor
1 3-5ohm fixed resistor (would an 8ohm work?)
1 0.01uF Capacitor
2 0.1 ohm fixed resistors
edit2: and the capacitor can be rated higher right? so a 1uF 50v would work?
Last edited by kryptobs2000; 01-19-2005 at 02:59 PM.
E8400 @ 3600mhz
4870 @ 790/1100
2x2GB DDR2
Where are these soldered onto at? Same place that the green wire goes, and I could use 3 2200uF 50v and it would work too right? And sorry for asking so many questions, I don't understand how everything works yet, I just kinda do what it says, so I can't interpret things too good, but I'm on my wayThat's C2, the load caps [ look at the circuit picture ]. It's best to have them soldered on the board because one want Vout(+) stable at that end of the wire. They are connected over existing caps on the board, and one end of those existing caps reads +1.3V [ for GT ] = core voltage, the other reads 0V = ground.
E8400 @ 3600mhz
4870 @ 790/1100
2x2GB DDR2
They are connected over [ on top of ] existing caps on the board. Look at the backside of your GT and You'll find 20 small caps in 2 rows.Where are these soldered onto at? Same place that the green wire goes, and I could use 3 2200uF 50v and it would work too right? And sorry for asking so many questions, I don't understand how everything works yet, I just kinda do what it says, so I can't interpret things too good, but I'm on my way
One side of those caps reads +1.3V = core voltage, the other side reads 0V = ground.
You solder C2 on top of those caps.
My green caps are C2.
And Yes green wire goes to caps too, the +1.3V side.
1uF is different from 0.01uF, but I'm pretty sure that will work just as fine.
3 2200uF 50v is fine, although You don't need 50V lol.
Use max 5 ohm as R1, if You can't find one, use 2 10 ohm in parallel or 2 8 ohm in parallel.
Oh, and You need 3 heatsinks too. Those power trans / voltage regs can get hot.
But wait 1 more day before actually buying this stuff, I'm about to test a new revised circuit ! Perhaps it's more stable at higher voltage.
Last edited by OnLine; 01-19-2005 at 12:44 PM.
s754 PCIe; EPoX EP-8NPAJ // Claw 3700+ // 7800GTX // Cors BH-5 1GB // OCZ 520W // WinXP
Ok, I'll wait till tommarrow. Why would 2 10ohm, or 2 8ohm work, but a single 8ohm not? Wouldn't that just doulbe the resistance or am I wrong?
edit: and for the heatsink I was planning to use the stock 6800gt al heatsink, but I'm gonna put a fan on it, so that should work I would think.
Last edited by kryptobs2000; 01-19-2005 at 02:55 PM.
E8400 @ 3600mhz
4870 @ 790/1100
2x2GB DDR2
2 10 ohm resistors in parallel = 5 ohm [ 1/R = 1/R1 + 1/R2 ]
2 8 ohm resistors in parallel = 4 ohm
Like I said if You can't find a 5 ohm resistor, You can use 2 10 ohm resistors in parallel.
but ...
2 10 ohm resistors in serie = 20 ohm [ R = R1 + R2 ]
You don't want that.
Power trans and voltage regs needs to be mounted on separate heatsinks if You don't have non-conductive thermal pads to stick in between heatsink and the power trans / voltage regs.
The base, the backside on a power trans / voltage reg is conductive and leads directly to the mid leg/pin.
s754 PCIe; EPoX EP-8NPAJ // Claw 3700+ // 7800GTX // Cors BH-5 1GB // OCZ 520W // WinXP
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