Ok folks listen to me. Changing the VID DOES alter voltage, not just a label. This is a myth, and if you would like to try it out please do so. I am currently running the GTX BIOS, with unoptimized memory latencies and the 3D VID has been set to 1.05V. My clockspeeds are currently still at 600/800. I have tried a whole LOT of differing voltages myself, and 1.05V is about as low as I can go while maintaining a high degree of stability at 600Mhz. I have noticed that if I try to run at 1.00V while at 600Mhz, the system will crash within 3 seconds of loading ATITool. At 1.03V, the system crashes after about 4 minutes of ATITool. 1.05V is rock stable, even while running ATITool all night long. At 1.05V, while running with just the 3D window open (not scanning for artifacts), my temperatures peak out at 83C. At a voltage of 1.15V, my temperatures max out at 88C. While running at the stock GTX voltage of 1.24V, I have hit as high as 94C... Tell me again that changing the voltage in Nibitor does nothing...

The fact is that the STOCK GTX memory latencies are already at their optimum settings. I installed a STOCK ROM for the GTX and lo and behold, the memory timings are the same as Juan's 'optimized' rom. The GS is the only video card here that will benefit from this modded rom (as far as memory is concerned anyway... everyone will benefit from the unlocking of the BIOS) If you don't believe me, try it for yourselves. The difference between his 'modded' GS rom and the GSX mod that Yolda originally pointed out is completely superficial. The GSX mod already installed GTX timings onto a 7900GS. However with the GSX settings your NV Control Panel reported that you now had a GTX (even though it still correctly reports 256MB of RAM) Juan has simply modded the original GS BIOS with the GTX timings so that your computer thinks you still have a GS in it. Once again, this is more a superficial mod than anything. This is exactly why you guys are not seeing a benefit from flashing to his modded GS rom from your GSX rom you have been using. ITS EXACTLY THE SAME! Once again, if you don't believe what I am saying try it yourself!

Juan deserves a round of applause for bit-modding the BIOS lock for us. This has been a major inconvenience for everyone, especially you guys looking to hit that 'sweet spot'. However, the memory optimization mod is really just a reverse engineered GSX mod and will only benefit those who absolutely hate seeing the control panel tell them they have a GTX. I have nothing against Juan for his findings, as he did put a degree of work into getting this all figured out. He answered the burning question we all had about "why does the GTX BIOS let us hit 800Mhz plus memory clocks?" Now we can clearly see that the latency was the issue all along.

To say that Dell does this just to make money... well I think that is only half of the equation. The 7900GS uses tighter memory timings than the GTX. By tighter, I mean that the memory physically works faster per clock cycle. The concept is the same as with DDR2 RAM used for regular system memory. If you buy a memory module that is PC4300 for example, you may see that it has more than one timing set that it works with. If you run that RAM at 533Mhz, the SPD would perhaps set the timings to 4-4-4-12. Now if you use that same memory module in a system where the RAM would only run at 400Mhz, the SPD would instead use timings of 3-3-3-9. The latency values are able to be lower (better) at a lower clockspeed. However if you try to run the 3-3-3-9 latencies while also running at 533Mhz, you more than likely will get memory errors and/or freezes in Windows, or the system might just not boot. Of course you may get lucky and have a decent stick of RAM that was underrated at the factory and it may be perfectly stable... The same is true with GDDR3 in a video card. As the latency values get smaller, the potential to run the memory at a higher frequency decreases. You would have to slow the memory down by increasing the timings to allow a significant clockspeed increase. I remember there were many people who used the GSX mod and found very little real world performance increase from it. This is simply because the faster latencies of the GS BIOS outweighed the benefits of the major clockspeed boost and slower timings of the GTX BIOS. Example - GS clocked at 600Mhz memory could/would be comparitive to the GTX memory clocked at 700Mhz.

Dell wants you to buy the GTX because of the higher clockspeeds and more memory. Do they want to make money off of the consumer? Of course they do. The two offerings are there for the sole purpose of variety. Dell probably did lock the BIOS so that we wouldn't have an easy time figuring all of this out. You can be sure that they expected this to happen eventually though... With that in mind, I have a hard time believing Dell did this simply to rake the consumer over the coals. The E1705/9400 and the M1710 are nearing their respective EOL (end of life) periods. Soon Dell will release something bigger and better, and the process will start all over again. They have made their money on this lineup, and what we do with these systems now is in our hands.

In closing, I still will commend Juan for his efforts here. He has done what nobody else here has managed to figure out. I do hope he decides to hang around for a while and hack with the rest of us. Thanks bro, we appreciate the work you have done.

@Krayziepop
Sorry for my stupid question, but I dont want to waste my card.
If I want to use your 1.05V Bios from your previous post, what have I to do ?
I will copy it to the other Roms of juanloos CD, boot with it and then type "nvflash. yourromsname.rom" and thats it - right ?
And in your rom the clocks are free too ?
And what is, if my card can`t handle the 0.92V in 2D mode ? Will I have a black screen then, or am I still able to flash to annother Bios.
I hope you `ll find the time for an answer. thank you.

*falls asleep* so much reading lol

In order to do exactly what I have done, you must download a program called Nibitor. This is the NVidia BIOS editing program that has brought us to the point we are at right now. It's an advanced procedure that seems to be difficult for some people. I have already laid out guides along with several other members in the 7900GSX overclocking guide. The only thing you have to do is use the hacked BIOS of your choice off of Juan's ISO, and follow the below image to make the changes I have made.



You can feel free to try any voltages you desire, but these are the ones I am comfortable with. Once you do the above, you can save the file to your computer, then add it to Juan's ISO and reburn it. If you are going to be flashing a 7900GS with the GTX BIOS you will need the -4 -5 -6 flags added to the NVFlash command. Example would be NVFlash.exe -4 -5 -6 xxxxxx.rom

so with my 7900GS im running the 7900GSX bios on 600/800 is that my best option performance wise?

Wake up d00d, there's a hackin ta be dunn!

That depends on whether or not you want the ability to change the clockspeeds via software. If you flash your card with his unlocked and unoptimized GTX BIOS, then use coolbits to set the clocks to 600/800 there will be no performance difference between the GSX and the new settings. (other than you can change speeds on the fly...)

And if you would choose a too low voltage in 2D-mode... what happens then ?
Well I think I`ll stay with 1V in 2D-mode

The lowest voltage option you will have is .8 volts. I have seen a couple guys on here that are successfully using that voltage with no issues. Try it out, you can always flash back if it doesnt work out. As long as you don't try and tamper with the boot clocks, then it will be a reversible fix for you. If you boot into windows and it locks up at the desktop, you know its time to try a little more voltage.

question, is there any benefit/need to change the voltage of the 7900 GTX?

Being that the GTX uses the same exact core as the GS, then yes. The real benefit would be cooler running temperatures at full load, which I think is a big bonus. The 2D settings can be voltmodded down a bit also, to perhaps acheive a bit more battery time, and even cooler idle temps.

please, help, am i doing right.

im following this steps, and on step 4 i type 790GSUOV.ROM. (and the laptop runs at 1.24 volt, ? )

then everything should work ?

is the 1.24 volt flash BEST ? does it got highest temp with that also ?

He's right, when on battery my card stays in full power 3d mode so if I play a game on battery (which I do occasionally) I get at least 45 minutes less battery life If it is possible juanlu, could you (or anyone else who has the version without this issue) host it somewhere so people here that use their laptops on battery can use this wonderful mod without losing their battery life.

EDIT:
Never mind, he only unlocked the max performance setting for powermizer on battery if you set it to "balanced" it will work like it should.

The rom unlocks the clocks so you can change themin windoews, tHTAS great, but then agin the original ver 1 was perfect.
Now Noobs will get less battry life.

About Krayziepop posts over voltages, i found no evidnce in power drain or WATS using my programs so i cant says its true, but then again i cant say its false.. regarding the timmings, you wont get to 800mhz with the gs bios on a gs card, try it, and you will se it fries or locks up, i would recommend the battery life thing back and maybe some REAL optimiced memory settings. I AM Glad he send me this link now my card runs even better thant before now that i can select profiles and even get higher clocks with some tunning, THNKS AGAIN!

you guys rock!