what is your card ?
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what is your card ?
is there any more simple power mod for the 6800gt???
i understand that the vmem and vgpu mod on vr-zone should work with 6800gt's (256mb), but i'm also aware the power circuitry on the gt's isn't as complete as the ultras... i've seen the whole extra molex power thing - i'm incapable of making something like that...
but if there is something i can improve my gt with, ie... solder on a few capacitors, a mosfet maybe, i'd be willing to do that...
i've skimmed through this whole thread but can't exactly find the answers to my question... so can anyone direct me to a link somewhere? cheers
if you look closely to the schematics of the extra molex mod, you will see it's not a very difficult mod ;)
ok... i'll look into it...
OK well i just did the vddr mod, far out that resistor is tiny... but yeah, got it working... at 500kohm on the vr i get 2.22v for the memory already, and it didn't improve my OC's... so i dialed it up to 2.3, same deal, up to 2.35v...and now i've realised it has DECREASED my OC... :mad:
why has this happened? ram is samsung 2ns... this is a 256mb 6800gt...
damn... now i wanna try undervolting it ehehe...
curious if anyone else has found that using a multimeter measuring at TP11 (6800NU gigabyte) stock 1.2v bios gives 1.2v, mod it to 1.4v and the meter reads 1.3v and give it 1.5v and measured is 1.4v.
wondering if anyone could take a look :) ty
http://www.xtremesystems.org/forums/...ad.php?t=57645
Have heard that nibitor won't change bios so correctly if you change to 1.4 so it will be 1.3. On my geforce 6800LE the volt is 1.41-1.42 with a 1.5v bios and heard that the 1.6v bios should be 1.47v. They really undervolt :(Quote:
Originally Posted by Lesterp
that's fine with me, i only wanted 1.3v - 1.4v is what seems to be killing GTs and NU cards.
nbitor change nothing on my board:'(
but the capacitor mod for the mem worked great, 10mhz without an increase in voltage
hello,
i searching for a easy to solder Vmem Vmod for tha ASUS V9999GT 128MB AGP videocard. Anybody know a guide or Infos how it works ? I Only can found Vgpu Vmods
Here this card:
http://www.ocer.net/article/a_upload/1103796908_4-.jpg
http://www.web-upload.de/data/media/21/2.jpg
thanks for help
Is there a point on the back of the board where I can add an extra core cap? I can't add one to the front like in the guide as the Arctic Silencer covers that whole area..
poke around with ur multimeter on cap legs on the back of the mobo and find one that reads w/e ur core voltage is (not sure what card you have so I can't say). Then just solder the cap in parralell with that one.Quote:
Originally Posted by markiemrboo
So, I could use the core voltage measure point + ground?
6800NU, sorry :)
No, well.. it depends, but to be safe just find a capacitor on the front of the board, flip the board over and measure the + leg, if it measures the same as ur core it's more than likely a cap in that circuit, so then just solder ur cap in parralell with that one.
All the caps look to be just soldered to pads on the front of the board... they don't 'go through the board', so I can't really do that.Quote:
Originally Posted by kryptobs2000
I tried holding a probe to the + of the cap and then flipping it over and probing at random points. Lots of the points beeped at me, but when I measured the voltage of some of them later, none of them seemed to measure 1.2v (core voltage)
Anyway you can get a pick of the back and front of the board? Back should do but both would help.
Just serch for Tp11 on the back of your card. There you can add a capacitor. But don't think you need a extra capacitor for only 1.2vQuote:
Originally Posted by markiemrboo
Quote:
Originally Posted by ZeroHero
There IS a tiny resistor (resistance) between TP11 and core caps. I measured value ~ 1 ohm from GW6800le (see the 'Black screen quide)
http://www.xtremesystems.org/forums/...ad.php?t=59391
You may think that 1 ohm does not matter, but the series resistance of those caps might be ~ 0.05 ohms, and extra resistance to those nodes cancels the effect of added capacitor.
So, TP11 is NOT good point to solder extra cap and you must use capacitor leads for that purpose. However, I think also that extra cap for core is not required..
Original GT bios @1.3V
http://service.futuremark.com/compare?2k3=3925517
Ak350 (Silver + nickel plated) + Delta 60mm
@452/1150Mhz
http://img192.echo.cx/img192/3609/gpu6800gt3ns.jpg
fotinhas da 6800Gt
http://img22.echo.cx/img22/7427/6800gt1l7hq.jpg
http://img229.echo.cx/img229/6301/6800gt2l9he.jpg
I added a cap for the core voltage and although I got me about a 10mhz gain on the 1.4 voltage (Got me up to where im able to go past 405 at a maximum of 415 in rthdribl) I dont think its worth it.Quote:
Originally Posted by SikaRippa
Given the awkwardness of how you have to place the cap cause of the NV5 cooler, Im more worried about it getting knocked off instead of how much extra mhz I can get out of the core. Im quite satisfied at keeping it at 390 infact.
Its the ram seems to make the major diffrence. I got that sitting at 830 right now although I can push it to 850 without artifacting still. I just wish I could get me some fetsinks.. Those lower fets on the back of the card get so hot they burn to the touch.
okay, good to hear the teoretical part of my idea. :DQuote:
Originally Posted by SikaRippa
I think the LE has very stable volt, my gw6800le at least just vary 0,01v with 1,41vcore. But if you hardmod to get really much volt perhaps.
With 1.3v I can get to 425MHz without seeing any artifacts in 3dmark03, so I use 420MHz for general gaming, 100MHz with 0.1v, on air, isn't too shabby :) I pushed it up to 440MHz, the ONLY place I saw artifacts there was on the turtle shell, white blinking patches :( Hesitant to try 1.4v though as I hear other components on the back of these NU's get very very hot running higher core volts??
As for my memory, well, that's on going. Trying to get that sorted out in SikaRippas thread. The extra cap isn't helping me on that one and for some reason even with higher memory voltage (2.8v) the nvidia driver overclock test STILL caps out at the same 835-840MHz as it did before, at 2.7v :(
Quote:
Originally Posted by Reznik Akime
I agree, one can achieve some extra MHz by adding an extra capacitor, but I think that main limiting factor in the most cases is the GPU itself: how good/fast chip you have !Quote:
Originally Posted by ZeroHero
As posted by ZeroHero the supply voltage varies only little 0.01 V, but the memory voltage can have VERY high ripple voltage. I mesured 0.1 V ripple with multimeter under heavy load !! Since multimeter bandwidth is very low the actual ripple can be much more higher. Why such high ripple voltage ? I have investigated it and one important factor is that core voltage capacitors (c139 and c140) are high quality componentents from Sanyo (very low ESR and high max ripple current). The memory capacitors are from 'unknown' -brand and nobody knows any specifications for them ESR= ? , max ripple current = ?
ZeroHero: could you measure the ripple voltage of memory and GPU supplies under the same (heavy load), in order to make some comparison between cards ? (I wonder you have added capacitor = filters the largest peaks ?)
I have before measured volts, my vmem is 2.71-2.72 under a 3dmark05 round with a added capacitor to the memory. Without the capcitor the volt was 2.71, but with the cap added it can go up to 2.72 under load(strange, but perhaps it's the multimeter, don't know if it's quality).Quote:
Originally Posted by SikaRippa
Vgpu 1.41 but can go up to 1,42 sometimes under a 3dmark05 round. No capacitor on gpu.
So to me either vgpu or vmem have more than 0,01v ripple.
Wat card have a vmem ripple of 0.1v?
markiemrboo: disable the clock test, if it dosen't artifact it's won't hurt your hardwere. You overclock with rivatuner or? If not try Rivatuner
I measured values once more gain to be 102 % sure :D :DQuote:
Originally Posted by ZeroHero
--
I am now measuring so called 'GW6800le version 1b' which has a stock 3.19 Vmemory voltage !!!!! (see 'Black screen guide for details), but about the same AC-values was measured with 'GW6800le version 2' (=has memory voltage of 2.72 V)
When measuring DC-voltage (!!) very stable values are obtained for both memory and core, max variation is at range of 0.02 V
BUT when measuring AC-voltage the case is totally different. Core voltage variation remains low ~ 0.02 V all the time e.g. when running 3dmark03. Memory voltage varies A LOT in respect of frame rate (=current consumption, see BS-guide again) and I got again the same maximum AC-voltage of 0.1 V !!!
--
ZeroHero: Could you verify that measurement yourself (multimeter in an AC-measurement position) ?