where can i get the data sheet? I've tried google, but it has been no help.
BTW i did the vram mod from vr-zone, I'm running my ram at 2.37V. I can bench easily without arifacts at 1350, NFSU2 at anything much above 1200.
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where can i get the data sheet? I've tried google, but it has been no help.
BTW i did the vram mod from vr-zone, I'm running my ram at 2.37V. I can bench easily without arifacts at 1350, NFSU2 at anything much above 1200.
#301 What could you do before the mod?
And what type of cooling do You have?
BTW how mush is standard Vcore?
Would bee nice to do the VDDt mod ha ?? ;)
LOL at his username :D
Has anyone managed to further enhance their cards with additional mods or has managed higher clocks with a few cooling/voltage tweaks?
I've managed to verify glitch free clocks of 430/956 running 24/7 via bios mod, anything higher on the GPU core results in significantly lower memory clocks and vice versa, I could only run the memory @~936MHz if GPU is @438MHz...
standard vcore is 1.3V, kinda low considering it's a 110nm chip.
what's vddt?
i cool my card with a big chunky s939 HSF.
before i did vddr i could do 1120 fully stable. my core does 465
I put an slk900 and a really low cfm fan on my 6800 GT and it dropped my temp by about 20c. I only did the bios vmod to 1.4v and actually no improvement on my overclock than before with the stock cooler, but I can now overclock my memory stable to 1250mhz. I got a crap core tho :(
how have you fix your SLK900 on the board ?
zipties as suggested to me by another member (HaLDoL)
20C drop in temps LOL!!!!! :D
You need to up the GPU core @1.5v to go higher.
I was thinking something small and lighter in weight like this: http://www.overclockers.co.uk/acatalog/Others.html
bios modded to 1.5v didn't help at all, if anything it made my overclock worse I think. Hardmod might work better, but I don't know why. Maybe if I did some cap mods, and I'm interested in adding additional mosfets if someone would tell me how to do that, I know I just gotta solder them on top of the existing ones, but I don't know what type of mosfets are needed for this.
Last GT I had, I tried the vmem mod and fried it, not sure why though, it looked fine to me, but that makes me scared to try vmem or vcore yunno.
edit: would cap mods help a GT at all? either on top of the smd caps on the back, or in parralell with the 2 caps which gain power from the molex? I have added some on the smd caps before (in preperation for the second molex mod) but it didn't help. That however was on my old GT and my load temps were reaching the low 70's so that could have been limiting me. What about the other 2 caps?
edit2: One quick question, in doing the 2nd molex mod, I'm using a disc capacitor, how can you tell which side is negative and which is positive?
i tried the bios mod. it didn't help at all. I think only some cards support the bios mod.
Hey, I got an idea, not sure if it would work tho, but I don't see why not, and it would only benefit people that draw their vdimm from the 5v line, but I was trying to mod my dfi 250gb to do that, and thats how I came up with this idea. Would it work with the added molex connector, to make it draw from the 3.3v line? I mean, all you need is 1.4v+/- .1 so thats enough, but the 3.3v line has plenty of amperage, and it would be a completely different line (and if ur memory draws from 5v, it's pretty clean too). What about this idea?
I was thinking exactly the same actually, that would be really nice.
just, bumping this thread back up. I did the additional molex mod, and it gained me nothing. I'm quite sure it's working too, I measure 1.45v from it, and my card is running at 1.4v in the bios. Before I would artifact at 410mhz, now I still artifact at 410mhz. What a rip :( it's drawing from the 5v line btw, didn't mod the dfi, and I'm going 939 soon, so I doubt I will try and mod it.
here's pics, just testing it out. The mosfets don't even get hot, but testing with a dmm I do read 1.45v :confused:
http://img85.exs.cx/img85/7599/mod1fi.jpg
http://img85.exs.cx/img85/9476/card0jo.jpg
http://img85.exs.cx/img85/6498/running4uh.jpg
update: the mods not working. Am I supposed to ground the - side of the cap or something?
yes, the - side of the cap should be grounded.
-CaT
Ok I want do do the Vddr and Vgpu on my 6800nu and maybe the cap mods. What are the yellow markings in the pic for? Ground? Whats the max safe Vddr? Where can I get some 100k pots and the caps online?
So You did the power mod but "the mosfets don't even get hot" ?!Quote:
Originally Posted by kryptobs2000
One of the mosfets - they aren't mosfets btw, but PNP power transistor should get hot and the mod should be used in conjunction with 1.4V/1.5V Bios V-mod for best result.
This mod has helped me to clock my GT up to 505/1180 !
http://service.futuremark.com/compare?2k1=8455111 http://www.xtremesystems.org/forums/...es/rockout.gif
:confused:
Edit: Going through your image and the circuit/mod ... seems correct - just like mine ! :D
Here's the deal, unconnect the mod from the board and adjust Vout to at least 1.55V-1.6V instead of 1.4V-1.45V [ use 1.4V in VC-Bios ].
Once the mod is connected to the board the voltage will drop back to 1.42-1.45V for the core. The thing is, You must overvolt the circuit in order to take load off VC onboard/own power supply.
Now PNP power transistor should start to get warm/hot.
Exactly what PNP Power transistor did You used ?
ah, that makes sense. I had it running at the same (1.45v) as my board. I'll give that a try. Thanks OnLine.
Yeah and don't be scared if the screen becomes like a big mess when You post with the mod already connected to the card.Quote:
Originally Posted by kryptobs2000
It won't kill your card, but it may confuse it ! http://www.xtremesystems.org/forums/...milies/lol.gif
I recommend You to connect the mod after You've booted in to Windows and nVidia display drivers has been fully loaded and changed Vcore from 1.1V to 1.4V.
1.1V is the boot up voltage for a GT and supplying 1.55V in parallel may confuse the card a bit !
It has given me this screen of mess a couple of times.
1.4V, adding 1.55V-1.60V in parallel wouldn't [ shouldn't ] cause You any problem though.
If someone can find a fix and make a GT to work at 1.4V before Windows/nVidia display drivers loads, then great ...
Btw, how is your DFI NF3 250GB Vdimm hardware mod going ?
I'm very interested doing such a mod myself ! :stick:
Well it's working, and no problems when booting up and only having 1.1v, at least yet anyways.
And about the dfi mod, I havn't done it, and I don't think I am going to because I'm thinking about selling the board and if I do, I don't want to mess it up. Going 939, just waiting for newegg to ship my k8ns ultra.
edit: Well it is working I'm pretty sure. I think I've gained about 5-10mhz with it. I was hoping for more but I'm only using 1.4v anyways. I'll vmod later and see how it does, hoping for at least 450mhz on the core (410mhz now).
Just did the vgpu mod, it's now set at 1.6v however I get no additional overclock, if anything, it is now worse. Whats the problem? Temps are fine, 48c idle, not sure load, havn't checked yet.
http://img82.exs.cx/img82/411/gtvmod8vw.th.jpg
edit: I havn't tested it with the missing molex mod yet, my fan connector broke off so I need to fix that. My only guess is that maybe I am not recieving enough current from the single molex, I'll try setting the additional molex mod at 1.7v and see how it works.
edit2: Forgot to followup. With the additional molex, I still get no increase in overclock at all. I find this very wierd that i gain 20mhz+ going from 1.3-1.4v but I gain nothing but occasional throttling from 1.6v :confused:
Yeah it's working alright.Quote:
Originally Posted by kryptobs2000
1.6V on the core is high, You should try 1.5V instead and set the mod to work at 1.60V [ and slowly increasing the voltage up to 1.70V if necessary ].
This mod isn't perfect for higher voltage than 1.5V ~ the load between the the additional power and the boards own power supply becomes very unbalanced at 1.5V[+].
Try to disable FW. Perhaps You'll need better cooling like water cooling for higher voltage and speeds ! http://www.xtremesystems.org/forums/...lies/crash.gif
You don't think this is keeping it cool enough lol?
http://img129.exs.cx/img129/8094/gtcooling4th.th.jpg
It's not making the best contact but it should be doing it's job fine. I can't get 1.5v core unless I take off the mod. The lowest I can go with the mod is 1.6v by flashing to the 1.3v bios. This mod raises my vgpu by .3v, turning the pot(10k) does nothing. Not sure why lardarse didn't say to use a higher rated pot. I will try adding a 22k resistor tommarrow and hopefully that'll allow me to use 1.5v.
On another note, I tried the 1.5v through bios flash, no hardmods done at the time, I gained nothing from it. Also, doing all the mods, bios flash aside, this includes cooling mod, missing molex mod, vgpu mod, I have gained absolutly nothing on the core, how dissapointing. :(. I think my card just sucks.
edit:
Just for reference here's my experience so far:
Stock, 1.3v bios I would get 385mhz before artifacts.
Flashed to 1.4v (1.43 measure from multimeter) I would get 405mhz
All mods done 1.59v actual, 415 gets artifacts, 400mhz freezes up (throttles, power problem?)
Right now with all mods done, 1.4 actual (1.1v bios + .3 hardmod) 398mhz
I'd really like to get at least 450mhz at least out of this card. It's really a shame the core just really sucks or something on this. Any way you can see to improve this molex mod to allow 1.6v+ maybe?
Is there any way of modding the bios in my GFX card to go higher than 1.4V?
Or does anyone know which points to do a pencil mod on it?