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post #171 of 205
Quote:
Originally Posted by wavetrex View Post

Hi !

I made an account here just to reply to this thread:

I have GV-R797OC-3GD rev 2.1

I followed the procedures described here on the GB 7970 OC card, everything went "fine" apparently.
GPU-Z indicated 1.219v, card started at 1100Mhz, 1500Mem ... but unfortunately it was crashy during some tests.

Actually, it supported the exact same clocks as before... this made me curious.

So I opened the computer, take my digital voltmeter and measured the card's VRM output.

SURPRISE ! (or maybe not)

The voltage was 1.178 (approximately), like the original bios voltage ( which said 1.175 ) ...

So, the voltage is electronically locked and it cannot be changed by any software or bios flash.

Kinda disappointing... but at least others who have tried flashing should know that the voltage doesn't actually change, even if the software says it does.
Oh well.

---
p.s.

I am now on the new F3 bios ( http://www.gigabyte.com/products/product-page.aspx?pid=4102#bios )
Seems to work well, and it's back to the original 1000/1375.

Max stable overclocks are around 1060/1450 on my card ( ASIC Quality 69% ), anything more and crashes some games.
This is what I'm trying to say: There's a resistor that blocks the voltage at 1.17... No bios can deal with it. You have to remove a resistor on the GPU. I have a tutorial from an other forum but i don't know if i can post it here. PM me if you want the link.
post #172 of 205
Hello guys.

I also own Gigabyte Windforce GV-7970-3g OC version, revision 2.1. Asic quality 63 percent

Vga Bios I used most time is version F72. 1050Mhz Stable, not overclocking memory.

I Also did some tests with Skyrim on 1095Mhz. If the game was running standalone it was artifacting. If I ran GPU accelerated video decoding in the background flickering was not visible. I belive that powersaving features included with card are limiting factor for this, because with the vga decoding in the background I managed to have stable GPU even on 1125Mhz.

Newly released bios version F3 is terrible. Not stable even on 1050Mhz.

I am going to revert to first bios which was delivered with GPU, and perform the tests again. Can someone post me a link to GHZ bios you mentioned there?

Edit:
I used this bios http://www.gigabyte.cz/products/page/vga/gv-r797to-3gd/download/bios

GPU clocked to 1100Mhz, Vram to 6000Mhz and voltage changed to 1,26v. High load and temperature caused card to decrease its performance... Sice I dont have here MSI afterburner I did not noticed if voltage was unlocked.

Since this mod require also change of cooling I reverted back to 797oc bios version F72.
Edited by Offler - 5/6/13 at 9:36am
post #173 of 205
BIOS gives false hope with this card...

It reports 1.27V when flashing GHZ bios to the OC, but it's not true, it's a falsified reading. Someone did a test on the card, and it showed that it was still only drawing 1.17V physically. I also noticed while trying the BIOS w/ bitcoin mining that even though the clocks were higher, and the voltage supposedly so, that the true power of the card was not changed. The GHZ bios would get lower hashrates at a much higher clock than w/ the stock OC bios at lower clocks -- that just shows that the proportion has changed and it's truely just flase hope tongue.gif

You'd have to do something like

... But it's dangerous without the proper hardware to replace that resistor.
post #174 of 205
Quote:
Originally Posted by lunchtime View Post

BIOS gives false hope with this card...

It reports 1.27V when flashing GHZ bios to the OC, but it's not true, it's a falsified reading. Someone did a test on the card, and it showed that it was still only drawing 1.17V physically. I also noticed while trying the BIOS w/ bitcoin mining that even though the clocks were higher, and the voltage supposedly so, that the true power of the card was not changed. The GHZ bios would get lower hashrates at a much higher clock than w/ the stock OC bios at lower clocks -- that just shows that the proportion has changed and it's truely just flase hope tongue.gif

You'd have to do something like

... But it's dangerous without the proper hardware to replace that resistor.


You can also achieve that by measuring the power draw while isolating the card with a second psu and measuring with a killawatt. I suspect the draw will be lower since the ghz bios with its high clocks would actually be throttled most of the time.
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post #175 of 205
What exactly would removing that resistor achieve? Unlocked software voltage control with the regular BIOS or just straight up increase the voltage the GPU gets?
post #176 of 205
I also bought a Gigabyte 7970 WindForce 3X GV-R797OC-3GD, after flashing multiple bios's from different vendors and ghz bios, i returned it and got a msi hd7970 oc.

Paying so much money for a card and not being able to overvolt is nasty,

on the gigabyte website they say it supports it, but that was only the earlier versions. Later revisions have locked voltage.
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post #177 of 205
Well, with the GHz bios OC potential of the card increased. I was able to run it on 1100MHz which was not possible before. But at a price - temperature and throttling under full load.

So in my case even when the voltage actually did not changed (in my case it was verified by GPU-z, not measured) potential of the card itself increased, but it required additional cooling.
post #178 of 205
I have one of these cards. It's a disappointment. Now I can only blame myself for not researching thoroughly, I was going to get MSI but I read ppl said giga OC better =_='
post #179 of 205
Quote:
Originally Posted by Bloodred217 View Post

What exactly would removing that resistor achieve?

Unlocked software voltage control with the regular BIOS or just straight up increase the voltage the GPU gets?
I haven't tried it, but I believe you'd have to replace it with another resistor or a pot. Without the resistor no current can flow to that path right? But maybe I'm wrong, since the op said he only removed it and used some rare custom software to change the oscillation to increase voltage
post #180 of 205
Quote:
Originally Posted by Offler View Post

Well, with the GHz bios OC potential of the card increased. I was able to run it on 1100MHz which was not possible before. But at a price - temperature and throttling under full load.

So in my case even when the voltage actually did not changed (in my case it was verified by GPU-z, not measured) potential of the card itself increased, but it required additional cooling.

Flashing bios allowed me to run at 1125/1550 and run benchmarks but crysis 3 shuts down on me and I usually get dxgi (I think) device removed error. I googled this and I think it meant some problems caused the mobo to think that the device has been removed.

I think I'll have to clock down again (I don't want to lol because it means back to square 1 again).

I have rev 2.1 (is there diff version of this around?). People claimed 1180mhz with new bios but it doesn't run for me.

I might have to deal with the resistor as now I have 1 card able to run at 1175mhz and gigacrap that doesn't even want to run at 1100 with new bios.
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