150em - 7970m vbios voltage issues

Hi,

So now that I can not only read and flash new vbios - but am also armed with the information of how to edit a vbios via binary editor to create my own, I've run into something that has me stumped.

When running a "stock" vbios with a programmed 3d voltage of 1.05/1.00 it maxes out at 0.975. But if I run/have it programmed at 1.075 it runs at 1.075.

Why can I not run at 1.05??? I have throttling issues at 1.075 due to power supply issues so I'm wanting to play with voltages in the 1.00-1.07 range to see what I can get for results. But when its programmed for 1.05 - it runs at 0.975.

Also - I've read there is a way to modify the vbios to enable overdrive in CCC - if anyone has any information on that or can lead this horse to water, I'd sure love to edu-ma-cate myself!

Thanks in advance!!!!!

 

Have you tried 1.025V as that would seem like the next step.

 

If I am at 1.05 stock, how is 1.025 the next step? Or do you mean to make both settings 1.025/1.025??? Obviously I'm not understanding something your saying because I know your no idiot!

 

Next step to try to see if it works, maybe you are calculating the value slightly wrong.

 

??? calculating what? The stock bios is programmed at 1.05/1.00 and it wont run any higher then 0.975. I didn't touch that vbios.

 

Have you testing the clocking to check if its just reading the voltage wrong?

 

Yeah - like i said when it switch to a 1.075 programmed voltage vbios - it reads the 1.075. That's what I dont get.

 

So what kind of clock speeds are you hitting as you set the voltages then?

 

Voltage changes depend on how many steps voltage regulator has programed. On some desktop motherboards and graphics steps you have are steep. Regardles of what changes you make. So that is an issue you could be facing. Try downclocking your card and selecting 0.95 just to check if that is an issue in your case.

Also it could be an issue of software misreading information from sensors.

Sent from my HUAWEI Y300-0100 using Tapatalk

 

At a stock vbios of "1.05" - aka 0.975 the max I have been able to run on 3DMark11 is 955/1450 I believe it was. However with the newer driver I am running it will only run at 945/1425.

1.075 I have been as high as 1050/1500 but I'm running out of juice from the PSU when the CPU kicks in for the full load physics gpu/cpu test.

 

Have you tried a newer revision of the Vbios?

 

I haven't been able to put my hands on to many vbios, but I did try another "stock" one but I can't confirm the date it is from.

It gave me the very same results. Its like there is a limitation put on it somehow in the vbios based n something. Totally bland sentence but I hope you get my drift. I"m honestly just learning the technical side of vbios tweaking so I'm not really sure how to put it in technical words. ie - if I look at my "asic quality" (yes, I know - not the greatest reading in the world) it shows 80.2%. Perhaps my chip was binned at a lower quality and thus has a voltage limitation put on it? The only thing that doesn't make sense about that is the fact she runs rock solid at 1.075 v and 1050 on the core. Its still stable at that clock and I know I still have room to go.

I know there is the r1/r2 voltages, but it almost seems like there is a third somewhere in the vbios? I really dont know - I'm just kind of talking out loud here.

 

80% is pretty standard actually, you will have different voltages for different power levels.

 

I just found a vbios that allows me to run at 1.05 v finally. However I've figured out there really must be something wrong with my PSU because I get throttling even at this voltage and it definitely isn't from heat considering that the hottest my GPU got was 70 deg C during the run. But as soon as I get to the combined cpu/gpu run in 3DMark11 - it throttles.

I guess I'm pretty much stuck at any more tweaking and tinkering until I get a replacement PSU. Probably going to go with the 240 unless I cant resist the urge of buying the 330. lol

Thanks for chiming in while I figured things out. I'm curious to compare the vbios's when I get bored to see if I can find the difference that allows it to run at 1.05.