i go mad, i'm thinking of trying your mod and adapt it on a GF 4 Ti 4200 for fun :D
but i will wait until we found a way to have better output over 1.5V
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i go mad, i'm thinking of trying your mod and adapt it on a GF 4 Ti 4200 for fun :D
but i will wait until we found a way to have better output over 1.5V
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.Quote:
Originally Posted by Del Gro Badeu
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 ... :eek:
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 :)
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 :)
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.Quote:
Originally Posted by Jethro
Did you measure the voltage directly with a DM to verify the 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 :p:Quote:
Originally Posted by stealthbomber
Edit: Hey, this would work in place of the MJE2955 wouldn't it? http://www.fairchild-direct.com/ds/MT/MTP3055VL.pdf
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 !!!!
That's cos you ain't configured it properly. ;)Quote:
Originally Posted by kryptobs2000
How do I configure it then?
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?
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 :)Quote:
Originally Posted by LardArse
i will link articles on the first post.
yeah i know ;) but have a try on a cheap VC to know how react the mod can't be bad at all :DQuote:
Originally Posted by OnLine
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?
I believe the load is unbalanced.Quote:
Originally Posted by kryptobs2000
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.
:)
Nope, that's a n-Channel Power MOSFET, which is driven by voltage.Quote:
Originally Posted by kryptobs2000
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 ].
:)
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.Quote:
Originally Posted by kryptobs2000
:)
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?
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 ;)Quote:
Originally Posted by OnLine
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.Quote:
Originally Posted by kryptobs2000
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.
:D
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.
2 10 ohm resistors in parallel = 5 ohm [ 1/R = 1/R1 + 1/R2 ]Quote:
Originally Posted by kryptobs2000
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.
:)
Heres the bios INF to prove 1.6 is possible:
http://home.comcast.net/~dmpickard/16vscreen2.jpg
If anyone would like the modded bios to test i can upload it. Its modded via script to 16/6 and 1.6v gpu with stock clocks. 350/700 perf mode forced on.
The VID value of 00000011b represents 1.5v for pretty much all 6800LE/NU/GT/U bioses unless the Asus card's interpret them differently (in which case that still doesn't apply to your card), now if you had VID 00000111b or something similar then I'll take that as proof. :D
Just added another 4700uF cap for the GPU (look at the pic closely on page 2 you'll see there was actually none on the GPU line ;)), just ran one loop of both 3DMark2003/2005, glitch free so far, easily broke 12k's/5.2k's @438/936MHz... :banana: :banana: :banana: :banana:
Thanks again for the assist where credit is due. :toast:
the bit you refer to is actually my "performance mode" voltage and uses whatever voltage you set it to in modding ones bios. look again at my bios INF.
I could be wrong mind you. Either way it is at 1.6v. Do i need to take a picture of my multimeter?
Nice cap modding btw. Im gonna try the vmod + the cap ive installed before i add more. Have to get some more variable's.
I'm using that Asus 6800GT 128MB DDR1 bios as well remember, I'm >99.9% certain you are still running @1.5v... :D
Anyone here tried the 2x 12v molex mod where you simply hook up another 12v line from a separate molex cable to the card's 12v molex power cable?
Edit: to make it clear, nothing to do with the above 6800GT molex mod. :)
so are you saying that its not possible that im running 1.6v or that just because you have never seen it its not possible? via bios that is? And how do you know that the EVGA card does not support this plausable ASUS bios option? This EVGA card only differs from the asus in that it has 2.2ns ram instead of 2.8.
Im curious. Maybe ill learn something :)
LOL
AFAIK, the only way to go above 1.5v is to perform an actual volt mod, many have confirmed this, I HAVE tried modding that Asus 6800GT bios (both 128MB and 256MB version), voltage is the same, 1.5v max regardless of what the register says because the VID value is what dicates the voltage, not the label.
I need more GPU voltage, I'd love you to prove me wrong with an actual DM reading... :D
Its ON! now i have to figure out how to see TP11 past all the heatsinks i just installed lol. So you to have seen 1.6 in your BIOS INF? and in rivatuner? Can you tell im being really lazy and quite content with my card to even get up and measure the volts LOL.
In nibitor yes, not in rivatuner, you probably have choosen the incorrect VID option.
well i guess ill have to pull card to see where tp11 is and measure. If its at 1.5 then great cuz ill feel better about leaving it there that if it was 1.6.
Don't kid yourself, if it's measured 1.5v then you know fine well you're gonna need a volt mod... :D
well duh :D, i am at 31~35c even with 1.5v depending if my direct cooling is on or not ;) its all about the voltage circuit now hehe. im gonna be lazy and check it tomorrow and just burn the card in some more at 1.? tonight lol.
me ram is ok with 950 in most apps but it will need some more to be 100%. Cooling is not a prob anyhow ;) Ill post how it does with more than its current 2.72v + cap. testing 866 for 100% stability now after cap mod.
If I were to take a fan and solder it just before the molex connector, it wouldn't cause any problems would it? This way it'd be alot easier since the fan wouldn't have to be plugged in otherwise, just the power molex and thats it.
What I Can Make In Order To Runs My Card ?Ι Have A Geforce 6800le (msi) And I Can Resolve Still The Problem Of Black Screen!i Tried With A Cap 3300mf / 16v For The Memory(tp1) But Did Not Become Nothing!now I Try A 2200mf / 1ov With That I Can Put Core 300 And The Memory In The 800, But Without Run The Games!please Helpppp!!!!
Are you saying it won't run stock? Use a flashed bios to up the vcore, try maybe 1.4v (stock is 1.2v right?)
I'm gonna go to radioshack and get what I need, and I'll write up a guide on the additional molex, and I SHOULD have it posted by tommarrow for anyone who's interested.
The only thing it will do is increase the power draw on the molex, so as long as you're not using some crazy 10amp fan you're gtg.Quote:
Originally Posted by kryptobs2000
Or, if you added it in series - shame on you, your momma taught you better! :slapass:
well I went to radioshack and I got everything except for the MJE2955 transistor. So thats all I need :(
What am I looking for to find a replacement? Does it have to be TO-220 (don't even know what that means). Or what? Could someone please explain this to me... in uh... laymen terms :p: so it'll be easy for me to understand
edit: figured out what the to-220 is, it's just the uh.. shape or w/e you'd call it. I dunno these terms.
edit2: will this work? http://www.radioshack.com/product.as...%5Fid=276-2027
Before connecting Vout to the board, make 100% sure your home made psu [ which this mod is ] works properly. Make sure You can adjust Vout from ~1.25V up to ~1.77V. The circuit should allow that. Use different loads like resistors/lamps etc to see if Vout is stable.Quote:
Originally Posted by kryptobs2000
*You can get even higher Vout but then You must use a 1K pot.
You don't need higher output voltage for this application, that's why I replaced the 1K ohm pot with a 100 ohm pot.
Great, I'll go back to radioshack and pic one of those up. I'm learning slowly how everything works :). And I got a 1k pot since thats the lowest radioshack caries, but I don't plan to go over 1.77, or for the time being, even over 1.4v
edit: I'm having trouble soldering on the caps to the card now :( Havn't done a vmod in a couple months and so I gotta catch up. Spent over an hour trying to just get one on. Can't get them to bond at all for some reason. :confused:
Quote:
Originally Posted by OnLine
There is one big problem with this mod on 6800le...and i dont recommend to use this :(
If you put this power supply in pareller with your 6800le, you are going to give extra stress to the cards own lower gate MOSFETS, because they are short Circuited!!!!! when using this mod.... and I think they are going to warm a lot.....
The problems is that card is using PWM regulator and that mod is using Linear regulator... and they dont work together... In PWM regulation Mosfets are switching on/off in high duty cycle and In linear regulation (LM317) transistor is on all the time.
If you want to make volt mod, you sholud replase cards mosfets to bigger ones or put similar MOSFETs paraller with the existing ones., I have tried this (because i have burnt UGATE MOSFET of my own 6800le)
What kind of mosfets can you put on the card in parralell? and I thought the mosfets were under the heatsink, meaning it would obstruct the heatsink if they were stacked right?
edit: Did the cap mod, used two 3300uF cause they only had 1 1000uF. Havn't tried it yet, but should work.
http://img159.exs.cx/img159/358/dscf07360jy.th.jpg
That Is To Say It Will Be Supposed Flash The Bios And In The Vcore I Put 1.4v From 1.2?will Be Supposed Set Other Volt And The Vmemory?ok When You Prepare Driver You Makes The One Attached In The Forum!your Cap's That You Used Sum Of M/f Be Also Sums Of Volts Of??
I'm sorry but I have no idea what you said lol
I understood that, but didn't understand if your asking a question. lol, I'm sorry, I'm not making fun of you. Maybe try writing it in your native tongue, and using a translator online, or getting someone on the forum to translate, unless someone else can understand what you mean.Quote:
Originally Posted by firada
Eek! I think I fried my 6800 GT with the vmem mod. :confused:
Aha, so don't use this mod whenever MOSFETs are used.Quote:
Originally Posted by zadah
6800LE's users, don't do this mod !
What about 6800NU's, do they use MOSFETs ?
:eek:
What mem mod ?Quote:
Originally Posted by kryptobs2000
This one ;
http://img55.exs.cx/img55/9984/6800memvmod3hp.jpg
And what happened ? :eek:
Most (if not all) 6800LE/NU PCB's and it's components are identical AFAIK, only the bios and pipeline bridge configurations (resistors found at the back of the PCB) are different.
yeah, that one lol. I made another thread, I'll post the link
http://www.xtremesystems.org/forums/...ad.php?t=50933
there ya go, hopefully it's fixable but I'm not getting a good feeling. Maybe it's rma-able :p:
Yeah I thought so,Quote:
Originally Posted by stealthbomber
6800LE's/NU's users don't do the power mod !
Instead, to boost the power supplyed to the core and/or mem You should probably do like zadah said; replace the MOSFETs "with bigger ones or put similar MOSFETs paraller with the existing ones".
:stick:
How could the mod have killed it if its just one end soldered, its totally not in affecting the circuit at all.Quote:
Originally Posted by kryptobs2000
Not sure, not trying to hi jack this thread, I made another. I think it might have been in contact with that metal er... dot, to the upper left of the resistor (see the pic in my thread).
I think all of the 6800 series cards are using PWM regulators!!! so using this mod is very risky.... you should use it only without cards own regulator running.Quote:
Originally Posted by OnLine
I have tested to run 6800 LE:s core voltage with only one 1,5V AA Battery, works fine :) , But you have to disable PWM regulation... (And the regular AA Battery doesnt last very long about 5-10 minutes , so this mod is not for gaming:) )
I tried this battery mod after i Fried UGATE MOSFET of the card.
Hi everyone,
I've read the vmem voltage mod guide for 6800GT/Ultra in VR-Zone, but i have some notes and I'd like to warn 6800 ultra's users - Don't make this mod because it will easily damage the memory! This guide is right for only 6800GT, but not for 6800Ulta, because its memory is made with different (from 6800GT) power distributions. Nvidia set for ultra 2x Voltera's VT223 PWM chips (in contrast to 6800GT where there is only one - the second is missing) but their outputs don't share power! Every PWM distrubute power for two pairs of memory chips - half of the memory. I don't know what's reason NVIDIA engineers to set separate power in pair, because one of Voltera's VT223 basic features is to connect two or more chips in shared outputs as master and slave to distribute more power.
For the right mod of ultra, it is necessary to change resistanse of two resistors (in contrast to GT where there is only one and its see in the VR-Zone guide) with the same value - 43KOhm for 6800U reference design. Each of this resistors determines the voltage for 2 pairs of mem chips, and for this reason there will be two check points - in contrast to the 6800GT where there is one checkpoint because only one PWM Voltera's VT223 is set and it distributes power for all memory chips.
I have eVGA 6800 Limited Edition (The same PCB and components that Ultra), but for me this mod makes the memory unstable. I don't know why it happens, but i think it is due to a problem in the distribution of the proper Vref (Vref=0.7Vddq) that DDR3 requires.
In the pictures below you can see the second resistor marked in violet, and the check points are in the same colors as the resistors.
6800gt/u is very different from le/nu and doesn't have any MOSFETs.Quote:
Originally Posted by zadah
Using this mod on my GT is no problem, the thing is when this mod is connected to the board the heatsink [ see pic ] which cools a part [ 3 BGA styled chips, 2 fore core 1 for mem ] of the power regulator gets cooler. :)
Edit: 3 Voltera's PWM chips [ ty acdc ], that's what the heatsinks cool AFAIK.
The card doesn't behave or anything and no part of the board is hot.
The core voltage is close to rock stable.
http://img142.exs.cx/img142/3152/200...45500014aq.jpg
Ha ha, 1,5V AA Battery that's awesome but good to know if You lose the electricity to the house. :D
Edit: how can I disable the cards own regulator ?
Edit: and do You have an idea where or if I should add more caps in order to make the power supplyed to the board/core more stable.
Good info there, but it does help on the 6800U we tried it on, just penciling that resistor. It was an Inno3D.Quote:
Originally Posted by acdc
hum, i've a lot of difficulty to get a clean HQ photography of my unmodded GF 6800
if someone could do this for me it will be really nice.
post it here and i will add it to the quick how to i'm currently writing for the firs post ;)
Is it a GT or a regular 6800?
Can't do it, my cheap 4 year old Fuji 2.1MP digicam is useless in closeup macro mode, although I'm sure a decent pro photographer will manage something a bit more acceptable in macro mode... :D
I think the chips under the heatsink are the MOSFETS, because PWM control chip doesnt need any heatsink. If the heatsink is really getting colder, the extra mod can be used without any risk. In this case, PWM control is driving cards own MOSFETs down, beacause of over voltage in sensing line of the PWM control chip ( I am still sure, that every 6800 series card has PWM controlled MOSFETS, because other way is linear regulation, like LM317 in your mod.)Quote:
Originally Posted by OnLine
And Reason for Ultra cards distributing power to two different Memory lines is the fact that you cant use two PWM power supplies in the same power line.
You seem to have disabled it allready :), atleast it is not running in 100% power, if the heatsink is cooler. If you want to completely disable regultors you should ground the gate pins of all MOSFETS or remove them completely...Quote:
Originally Posted by OnLine
but i think there is no need for that in your case.
But if you want to make HEAVY DUTY supply replace MOSFETS with biggers ones like 30V/100A. Currently cards are using values like 20V/15-20 A...
I dont know if there is any help to use extra caps on GT/Ultra cards, because they seem to have power supplies, which deliver stable voltage on "stock" settings.
Thank You !Quote:
Originally Posted by zadah
http://img76.exs.cx/img76/216/clipboard021pa.jpg
Doesn't MOSFETs always look like that or similar ?
3 legs, black and big.
Under the heatsink, there are 3 tiny BGA styled chips [ grey IIRC and many legs ].
I'm confused now ? :confused:
Has anyone come up with a pencil mod for the ram on 6800NU?> I just dont want to take my card out with the waterblock making such good contact.
also I have a naked dead 6800GT i can take pics of and post if needed.
it's a regular 6800Quote:
Originally Posted by kryptobs2000
one of my friend's father is journalist and photographer and have a really good digicam ( a lot of MP :D ) i can ask for him to take some photography but it will take some extra daysQuote:
Originally Posted by stealthbomber
It's a unnecessary risky mod to perform, things such as fixed resistance dependant on lead type used, quality of signal path (correct me if I'm wrong here) etc.. mods for the lazy people... :stick:Quote:
Originally Posted by Jethro
Dang dood your anal! Some of the best clockers in the world dabble with pencil mods. Who the hell made you clocking GURu elite? Its not rocket science lol.
If i want to be "lazy" and Carefully raise my DDR voltage with a pencil mod to test it out and then if it amounts to anything install a POT later than so be it. what the hell is wrong with you?
LOL :DQuote:
Originally Posted by Jethro
Just an opinion, it's an easy mod to perform but a "clean" permanent contact is preferred, take a chill pill would you! :rotf:
Ill take a chill pill if you stop being such an opinionated geek ok? :D
QUOTE:
It's a unnecessary risky mod to perform, things such as fixed resistance dependant on lead type used, quality of signal path (correct me if I'm wrong here) etc.. mods for the lazy people...
ALL the mods were doing are RISKY and unecessary and thats really besides the point. Pencil mods are no more risky than taking a soldiering iron to a $300 dollar board IMO. If you can measure resistance before and after than its really not very risky at all...
:rolleyes:
That depends on your soldering skills and the way the mod is suppose to work, I'd take the advice of the EE's (with far more confidence) over any overclocking guru around (who usually has a fair bit of money to replace any fried hardware), any day. :)Quote:
Originally Posted by Jethro
Im sorry maybe its a communication gap but i dont see the point of your last post to be honest dood.
Anyways back on topic, for thos who wish to know the GPU measuring point of the 6800NU
http://home.comcast.net/~dmpickard/CAPmod.bmp
There are someone to explain me how to do a success capmod at my card?I have msi nx6800le and i tried did the mod with 3300mf/16v but didn't worked!If are you can explain exactly(with photo it's fine)please post a reply to forum!Plss hellpp!Thnx :(
If you cant figure out cap mod from my pic then yah just dont need to be performing the mod :D
Ram would like some more juice im sure but the cap has helped stability probs @ higher ram speeds for sure. :toast:
http://www.kolumbus.fi/ap.salmela/CAPmod.bmpQuote:
Originally Posted by OnLine
Sorry, Jethro i Had to borrow your good bicture...was it copyrighted ;)
Here picture of all 6800 LE's MOSFETS and their functions.
There is image which explain how VGPU is made in MOSFETS.
Here is simplified diagram of 6800 LEs PWM control + MOSFETS, principle is same in all 6800 series cards, only PWM controlling iC varies... AND i Have Added CAP mod to VGPU in picture.
http://www.kolumbus.fi/ap.salmela/ISL.JPG
You said "Ram would like some more juice" what do you mean with this?I did the cap mod like with your pic but with other capacitor!Only with cap,no mosfets or other,but i can't fix the black screen yet.I set the vcore from 1.4v to 1.5v(3d) and 1.1v to 1.5v(2d) the thrl it's default 1.2v!I must to do something else??Thnx!!Quote:
Originally Posted by Jethro
More power to the ram.Quote:
Originally Posted by firada
The mosfet and vgpu controler cooling is my main concern. What are the maximum temps that these can operate at before failing? I'm talking about the ugate and lgate mosfets of the gpu and the ISL6534.
This could help you, it is VGPU LGATE MOSFET temperature Vs Drain Current graph :Quote:
Originally Posted by vortex240
http://www.kolumbus.fi/ap.salmela/temp.JPG
It can work in very hight Temps, but Effiency is falling dramatically....
if it is for these components then this is good news also I imagine ugate will have a similar max temp if not higher btw how do you know this graph is for these components?
also its the ic that worries me the most
Here is the complete datasheet for VGPU LGATE Mosfet, it can allso be found at www.irf.com:Quote:
Originally Posted by vortex240
7832.pdf
And Here is DS for UGATE and LGATE for DDR:
7821.pdf
I dont know type of UGATE VGPU MOSFET , if anyone can help please reply...
I think ISL PWM controller will newer warm too much, because it is just controlling IC.
i've searched for the ugate vgpu mosfet and was unable to find something intereting on google : /
More power from vbios mod or with a cap???With 1.5v(3d) from bios the temperature is under from 70c!And default volt mod the temp was it 47c!!Quote:
Originally Posted by jumanji969
vcore = voltage for the coreQuote:
Originally Posted by firada
stock 6800 Ultra - 1.4v
stock 6800 GT - 1.3v
stock 6800/le - 1.2?
vddr/vdimm/vmem = voltage for the memory.
stock 6800 ultra/gt - 2.05 (I think)
stock 6800/le - don't know
That capacitor mod helps stabalize the memory voltage, vddr. It has nothing to do with the core voltage. You cannot change the vddr voltage within the bios. Only the vcore voltage. Do you understand what I'm saying?
Your talking about vcore.
I know that,but i readed in other forum that the vcore it's must to be 1.5v(3d&2d)!And i know what is do the capacitor.I don't want to do my card rocket,only to do play's games normal,without black screen!I didn't this yet,but i hope to solve!!!Quote:
Originally Posted by kryptobs2000
good information here! I suppose one should install heatsinks on these mosfets for better voltage stability?
Yes, the copper heatsinks helped in my case but I needed active cooling, the area where all the caps/mosfets are located at the back got rather hot after looping the card for several hours (>7hrs) until eventually it produced small visual glitches due to heat build up.
I adjusted the position of the 92mm fan to make more space and tied a 80mm fan right at the back of the card, passed 10hrs worth of loops before I stopped it.
I'm tempted to add another fan at the back of the card but the hard disk IDE cable hangs over the cards back blocking some of the airflow...
Yeah, just just what I thought ! :DQuote:
Originally Posted by zadah
Nah, actually I'm even more confused now but it seems to me le/nu has far more controller chips than gt/u. My gt doesn't have any of those U/Lgate mosfets showned in your picture, but it does have a big fat chip [ ~40 legs reads VT1103M, probably instead of ISL6534 ] on the backside of the board and 3 bga styled chips [ possibly 100 legs ] underneath that heatsink.
Hm, 117s adj441 [ 3 legs and 2 of them ] ~ don't know, perhaps these are mosfets although it doesn't look like that.
:)
I measured the temp of the ISL6534 and it gets quite hot. At 1.2 stock nu voltage it peaks at close to 50 C after some hardcore 3d. At 1.4 v its near 85 C. I didnt even wanna try 1.5v seeing how the trend was progressing.
For GT/Ultra it's not clean MOSFETs.Quote:
Originally Posted by zadah
Volterra's VT1xxx series is Multi-Phase (up to six) Synchronous Buck Voltage Regulator Chipset. It's contains master controler chip (VT1103M) and up to six secondary VT1103S - power MOSFETs with integrated drivers.
That's right for more PWM, but for Voltera VT2xx series (Single-PhaseQuote:
Originally Posted by zadah
Integrated Synchronous Buck Voltage
Regulator Chipset) it's possible - see picture above ;)
Ok, i havent measured those temps personally... but sounds bad beacuse max operating temperature is rated 85 C !! I cant realize warming of that controlling IC...Quote:
Originally Posted by vortex240
Quote:
Originally Posted by acdc
OK, i tought GT / Ultras are using regular MOSFETS....
i felt the IC after some heavy gaming and noticed it gets really hot! ive since backed down to 1.31vgpu and for some reason after burning the GPU in its perfectly fine @ 410 now with much less volts. Now if i can just figure out what the ram wants/needs!
the rams wants/needs to be really hard overclocked :D
i've starting to mod my card yesterday, but i need to wait for my new wateblock and water pump to test it :/
went and bought a new 15/30 watt iron, extra tips, tips for my 60watt and a 10k pot.
They didnt have but one of the good 10k pots left! anyways gonna do the mod tonight ill post results.
ok i soldiered 10k pot to one of the red points and nothing? all i get is black screen when lowering resist? The pot reads voltage fine 2.73. Can someone show me exactly where the ddr vmod is on my card please? im using the lowest red dot and ground so i dunno whats up.
>>>
well the front page is wrong then cus the lowest red dot doesnt work! thanks stealth ill have to do it again. Is a 10k pot to little? i would like up to 2.9v. According to first page 10 = 2.95! so i read it wrong for shopping today.. what are you using? figures i go thru all the trouble and the one spot i pick to soldier is wrong lol.
At least i didnt FRY the card DOH! :toast: