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ATI Hd 7950/7970 bios mod thread - Page 67

post #661 of 1284
Guys, I apologize for this barrage, I just have a number of misconceptions about TDP, and felt it'd be better to condense and put these mini questions into one post/place, rather than sprinkling them throughout pages of thread and creating clutter.

If you can only answer a couple, feel free to only answer what you can, and as short as you want:


  • Is TDP a voltage/amperage/wattage?

  • Is it possible to view a card's current TDP levels "live" (without opening BIOS)?

  • What's the "min" TDP for? How does it factor into things and why should you care what level to set the "min" at?

  • Is TDP a limit of how much can pushed through the card, or is TDP an actual rateof what will be pushed through the card?

    (i.e., is TDP like holding your hand a few feet above a kid's head and saying "Kid, this is as high as you'll be able to jump", or is it like picking the kid up and holding them up in the air at that height?)

  • Is it possible to set a TDP too high? What would happen (what would the effects be)?

Edited by Coldblackice - 3/10/14 at 5:58pm
post #662 of 1284
TDP is an estimation of watts/power (amps factor in to watt calcs)

Live? Dont know but run occt to see where you throttle, watch gpuz clocks.

Min, just arbitrary.. I set my min higher so theres finer adjustment of it. Default is +-20, 40 divisions.. more diff between min-max...each % does more change

TDP is where the load estimate will be capped(by dropping speed). but because amd didnt put actual current monitoring in, its an estimate.

Too high on my card, if I am at high 1100+ oc, I get overcurrent in occt, black screen have to power cycle pc.
post #663 of 1284
http://www.overclock.net/t/1473293/changing-xfx-7970-dd-ghz-voltage#post_21935845

Here is my thread I just started before I found yours. Seems that you mostly post up 7950 BIOS's here is some detailed information on the XFX 7970 GE DD BIOS flashed to a XFX 280X.
post #664 of 1284
Hello to all.

I have a XFX R7970 DD - GHZ Edition card. Unfortunately i cant modify voltages under any software like MSI Afterburner etc.
So i use VBE7 to adjust the GPU voltage via the bios. I want to undervolt my card to get lower temperatures on full load.
The "VRM" is marked as "unknown" in VBE. So i can only select voltages from a predefined list. But why is there such a big leap between
1100mv and 950mv ? My card runs stable at 1100mv so i want to go bit lower. Have someone any ideas ?

avhfnuge.png

rrkhwfrw.png


Is there perhaps an other possibility to get the voltages unlocked ? I have no Bios switch on the card so i dont want to flash a bios from different models if i am not 100% sure.

Thanks in advance for your help.
Edited by Tatwaffe - 3/19/14 at 1:58pm
post #665 of 1284
If you go on tech power up you can get an xfx 280x bios or a 7970 bios that don't have predetirmened values and you input the voltage manually.
post #666 of 1284
Has anyone heard of the "Stilt" bioses? There's a guy named Stilt who *was* custom-modding AMD card bioses, tweaking the cards' "memory-timings" for better performance. In the mining world, this elicited big jumps in performance, and the miners were going wild over this.

Stilt went dark and dropped off the radar. I've been wanting to use one of these bioses for my gaming (I don't mine), but unfortunately, Stilt disabled half of the cards' ROPs to reduce power draw. From what I've been told, this fact would cripple game play.

So I'm wondering if anyone knows how to re-enable ROP's within a bios? I've thought about doing a hex-compare of before-and-after bioses that Stilt's done, perhaps finding the precise bits/flags that enable or disable the ROP's. But it could be that Stilt altered the entire layout of a bios through his tweaking.
post #667 of 1284
Thread Starter 
I have edited my personal bios ram timings without disabling the rop units. Its a minimal gain but still a gain. The way it works is in bios there is a specific ram section for timings set between certain speeds. Ex. 150mhz, 400mhz, 800mhz 1000mhz, 1250mhz, 1375mhz, 1500mhz, 1600mhz, 1750mhz+. Some cards are different by a little, or even have two sections due to the different ram types so the speeds are a little different. How it works is say for 1250mhz up too 1374mhz ram timings are between this once you hit 1375 to 1499mhz its the next set of ram timings, and so on. Without entirely changing everything you simply edit the ram frequency by dropping in the faster or higher speed in the lower section. For instance I removed 1250 and put in 1500mhz for mine then spaced it out after that so it was more like 150, 400, 800, 1000, 1500, 1575, 1650, 1750mhz. Since my cards would have ram artifact's dropping into the 1000mhz range.
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post #668 of 1284
How sure are you guys that he disabled rops? I tried to find comment on it in his original thread but didn't.
I'm running his bios on my card purely for gaming so I should probably just test and see for differences between this and stock.
Thanks
post #669 of 1284
Quote:
Originally Posted by kahboom View Post

I have edited my personal bios ram timings without disabling the rop units. Its a minimal gain but still a gain. The way it works is in bios there is a specific ram section for timings set between certain speeds. Ex. 150mhz, 400mhz, 800mhz 1000mhz, 1250mhz, 1375mhz, 1500mhz, 1600mhz, 1750mhz+. Some cards are different by a little, or even have two sections due to the different ram types so the speeds are a little different. How it works is say for 1250mhz up too 1374mhz ram timings are between this once you hit 1375 to 1499mhz its the next set of ram timings, and so on. Without entirely changing everything you simply edit the ram frequency by dropping in the faster or higher speed in the lower section. For instance I removed 1250 and put in 1500mhz for mine then spaced it out after that so it was more like 150, 400, 800, 1000, 1500, 1575, 1650, 1750mhz. Since my cards would have ram artifact's dropping into the 1000mhz range.

So if I understand correctly, is the process of tweaking memory timings like tweaking a "fan profile", where you're mostly tweaking the "stages" between jumps? Or are you actually tweaking the specific memory timings like done on PC RAM timing, tweaking timings CL, tRCD, tRP, tRAS, CR, etc. in the BIOS?

In other words, is tweaking memory-timings a process of altering the "stages" of when certain timings are activated, or are you also tweaking the actual specific timings themselves (which are activated according to the current memory clock speed)?

(Thanks for the info, by the way! I've been looking for more info on tweaking GPU memory timings)

Also, you mentioned minimal gains -- what kind of gains have you seen (on average)? Do you have an example of how many FPS increase you'd get (in your tests)?
post #670 of 1284
Quote:
Originally Posted by Bkpizza View Post

How sure are you guys that he disabled rops? I tried to find comment on it in his original thread but didn't.
I'm running his bios on my card purely for gaming so I should probably just test and see for differences between this and stock.
Thanks

TheStilt mentioned somewhere disabling half the ROP's himself. I'm searching for the source again right now.

What kind of gains or losses have you gotten from using Stilt's bios? I'm curious to see a gamer's experience with Stilt's bios, because I've only found miners' experiences.
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