ATI 4850/4870 voltmod thread

[raibemunn]

who needs CCC anyway :P

srsly though, is my card really that bad or am i doing something wrong. vpgu 1.35 and only 770MHz stable (really stable).
(my mem chips are naked, but not vmodded/clocked too bad. gpu causes those yellow spots in fur, right?

[Krautmaster]

thanks 4 help. I loaded my orginal bios with RBR 1.17

Didn't change anything like hash ore something else, only frequencies and voltages. Card does well in Windows, 2d 160/500 - 3d 825/1120 - very stable.
Connect to HDMI crashes system.

Orginal:






and the modded - same but other frequency / voltage settings



so what shoud I change in my orginal bios to create a new bios with 825/1120 in 3D and a crashfree HDTV support?

Thanks for info with overdrive, installed 8.10 - overdrive disabled, overclocked with rivatuner to 850/1200 but after every benchmark in vantage - clock droppes to 625/1200 an stays there. Strange. So the first "level" benches with 850 up to 900 Mhz and the following were benched wth 625.

Never changed the Hash in RBE in the "Additional Features" tab.

I will try a new bios now, UVD Settings untouched. Perhaps card crashes caused by the UVD clocks...

[Barr3l Rid3r]

yes, u cant custom made your hash mod anymore...use the ready one: method 1... select change to these settings...


dont change any of the frequencies except one!, just change the lower setting avaible (clock 1) to 0.93 v and 400mhz gpu... all other (despites boot and UVD, leave them unchanged) change only the voltage to 1.158 (NOT the FREQUANCY), it will give you more precision in the pot...

use RBE 1.17...



Pros...

CCC working again on latest drivers, w/ lower voltage and frequency in 2D mode, but higher voltage on 3D mode, w/ CCC OC

Cons

limitted to 800/1300Mhz.


P.S. disable Overdrive and u can use latest Rivatuner 2.20 for benchs OC or if u need in a game... it will scale to 3D higher voltage since u change the clocks on it.

please read it againg carefully these time

[Krautmaster]

who needs CCC anyway :P

srsly though, is my card really that bad or am i doing something wrong. vpgu 1.35 and only 770MHz stable (really stable).
(my mem chips are naked, but not vmodded/clocked too bad. gpu causes those yellow spots in fur, right?

check your voltage converters temperature, they become really really hot.
I have big sinks on them, but also need an active fan to hold them on temperature...



@Barr3l Rid3r

sorry, will try that. Thanks man. Now i changed only clock 1 to 0.93 and 400 GPU, all others voltage to 1.158, UVD and Boot completely untouched. Shoud i change the clock info 07 to 0.93 and 400 too? Sorry 4 that silly questions.... perhaps you can open your bios with RBE and take a screenshot. Or host it and I will try it. Thanks again.

Edit: Works fine with 400/0.93 at clock info 01 / 07 - thanks a lot. So for OC my card, i have to take Rivatuner in 8.11 and other tools in 8.10 right?

[Krautmaster]

card does 910/1180 now vantage stable but I need 1,39 V to bench this.
24/7 @ 1,36V with 850/1150

http://img518.imageshack.us/my.php?image=9kqh3.jpg

VMem Mod makes no no difference. The OC result became worse with more voltage...

[Iarwa1N]

i have a Connect3D 4870 1gb and before voltmod i got 17400 from 3dmark06 @ 850/1000 with q6600@3.5ghz. But after voltmod i could only make it stabile @ 860/1100 1.36V and it wont go any higher than that. And the real strange thing is i can only get 16300 from 3dmark06 with 860/1100 (lower than the 850/1000 with stock voltages). What could be wrong ? I dont have any heatsinks on voltage regulators and i have twin turbo and heatsinks on rams.

[Caveman787]

I would think voltage regulators being to hot in that case.

He has active cooling but no sinks and is having issues, you have active cooling but sinks. I think both are required with how hot they can get.

[raibemunn]

but i have sinks on them, not under active cooling though. results are about the same as Iarwa1N's. 1.36 and 870mhz (hd4850).

[Iarwa1N]

I put sinks on my voltage regulators but the results did not change, i still can't bench above 860, i guess this is the top for me. But i find the reason of the low 3dmarks, it is Ati Tray Tools. I was keeping ATT open during the 3dmark06 to monitor temps. I got +1000 with the same settings without ATT running.

[RASTAVIPER]

Hey guys, I need some help here.
I have the Sapphire Radeon 4850 and yesterday I flashed my modded BIOS with RBE 1.17.
I changed the default clocks to 720/1200 and I changed the upper limits to CCC at 800/1300.
After tha flash went ok, I tested the system by playing 30 minutes Far Cry2.Everything was great and the temp was good as before the flashing.
Also I used the pc for 4 hours for watching TV or internet use.

Today, I wanted to see some emails and when it reached at windows desktop, I got 3 vertical columns full with artifacts and then my pc froze.I rebooted 3 times and everytime I got the same thing.
Sometime, I got a VPU recover message (even if I had it disabled) about that the graphics adapter was reset.The screen was ok for a few seconds, but again the pc froze.

What is your opinion?Can the bios cause all these troubles, when yesterday was working fine?Can the fan create problems?Or maybe the drivers, which were installed again after the flashing..

[Iarwa1N]

Heh, i think i just killed my card with furmark I was monitoring vrm temps and after 5 minutes the vrm temp was 127C even though i have sinks on vrms and than bum! black screen and now d601 led is on and there is nothing on screen. is there any way to fix this or my card is dead for sure ?

[raibemunn]

hmm good to know lol. imma change my small heatsinks to something bigger today :P

[leoy]

Hey guys, I need some help here.
I have the Sapphire Radeon 4850 and yesterday I flashed my modded BIOS with RBE 1.17.
I changed the default clocks to 720/1200 and I changed the upper limits to CCC at 800/1300.
After tha flash went ok, I tested the system by playing 30 minutes Far Cry2.Everything was great and the temp was good as before the flashing.
Also I used the pc for 4 hours for watching TV or internet use.

Today, I wanted to see some emails and when it reached at windows desktop, I got 3 vertical columns full with artifacts and then my pc froze.I rebooted 3 times and everytime I got the same thing.
Sometime, I got a VPU recover message (even if I had it disabled) about that the graphics adapter was reset.The screen was ok for a few seconds, but again the pc froze.

What is your opinion?Can the bios cause all these troubles, when yesterday was working fine?Can the fan create problems?Or maybe the drivers, which were installed again after the flashing..

When u give 1.158 in that sapphire card the vrm's can't handle it and die. My sapphire card was making squealing noises,then weird artifacts, took it back to default,and realized all games crash.... rma...

[cowie]

guys i'm sry i'v read like over 30 pages(atleast)
i just picked up a sappire 4850 so far me and my trusty mm and pencil have only found a way to lower volts lol.
it does not seem to be as"stought" as referance in design but can i get help on volt mod.or anyone have one done they could share?

http://www.newegg.com/Product/ShowIm...d%20-%20Retail
you can zoom pic but you cant see traces that well

[Krautmaster]

Heh, i think i just killed my card with furmark I was monitoring vrm temps and after 5 minutes the vrm temp was 127C even though i have sinks on vrms and than bum! black screen and now d601 led is on and there is nothing on screen. is there any way to fix this or my card is dead for sure ?

damn, think one or more of your regulators are damaged. In your case, i'd clean the card carfully, perhaps you'll find a damaged brick. First i put heatsinks on my card, card doesn't boot, same problem as you have. After cleaning and mounting orginal sink card works fine again. But a freeze while card was in action seems like something died on the card.
Furmark espacially needs a geat cooling performance, my voltage regulators become about 10-20°C hotter (with big sinks) than in Crysis. I think thats the reason why i can bench Vantage with 910 and Furmark has problems with 850mhz. The voltage is not stable enough for Furmark >850. The VR are designed for 625MHz @ 1,16V , 850 @ 1,4V needs nearly twice or more power than standard configuration.

Clean your card carefully but decent and send in for warranty. If you try to fix anything on card, warranty will be lost for sure.

I have active cooling with big sinks (look at pic above) - the sinks are getting very very hot if take off my fan. I think without these sinks, regulatos will die in seconds.

[andL64]

Gainward and Palit 1024mb is good up to 1,6V vgpu @ air (cold air from outside)
take care on pwm area, but really improved power delivery here...

didnt gain much mhz @ 1,5V+ (4 sure just better cooling needed)

maybe it can reach with about 0°C 1ghz core 3dstable

never tried vmem mod, just searching for vdroop ^^

she's @ 1,6V (load) ready for about 960-970 3dmark stable




(screeny is with ambient temps @ 15C 1,5V (load) but still in nature card is running pretty hot but doesnt stop working )

[DJSUB]

what do you think about this voltage @ full load? do you think it's possible?
my 4850 is volt modded & i use 1.4v for vgpu.
i set 0.89v idle & 1.044v full load in RBE together with 800/1150 core & memclock.
i'm wondering if the hardware monitor's detecting the real voltage required to run 800/1150 stable on atitool artifact test and furmark.
or it's only detecting the voltage set in the bios by RBE? i thought 800mhz core required 1.3v and above?

[Krautmaster]

it detects the bios voltage settings. Use a voltmeter to messaure the exact value. You can try every possivle voltage setting, up to 1,158V in 3D and <0,9 V in 2D. But be carefull, some of the non reference layout cards may become damaged by to high bios voltage settings. Ive read somewhere about that. My Powercolor card didn't have any problems with possible voltage settings.

But maybe you will have problems when adding a second display, read some posts ago an search for what the right RBE settings to prevent bluescreens in dual display mode.

[GamerBR]

If anyone has a broken hd4850 and is interested in selling it please PM me,as long as the voltage controller is working.I'm interested in buying any reference design card or the sapphire dual slot for parts.

[Jimbo Mahoney]

What is the best software to use for overclocking these cards?

I've been using ATI Tool for my 3850 without installing the ATI CC. Is this still the case?

Many thanks!

EDIT - I saw a post indicating that if using Cat 8.11, you must use RivaTuner to clock?

[andL64]

What is the best software to use for overclocking these cards?

I've been using ATI Tool for my 3850 without installing the ATI CC. Is this still the case?

Many thanks!

EDIT - I saw a post indicating that if using Cat 8.11, you must use RivaTuner to clock?

yes latest version of rivatuner will do the job fine! (download @ guru)

[drizzt5]

Hey what programs do you guys use to test the stability of the cards?

Well actually I'm guessing you guys use ATItool and furmark for the most part. But how long do you run them for? I just want to have an idea how I should test this card to make sure it is close to 100% stable.

[@lex]

Hello!
Does anyone know something about Vmodding ASUS 4850/HTDI/512M/A
(it has non-reference Glaciator cooler, non-reference board design but standart clocks).
Thanks.

[ceemic]

@lex, macro closeups from PWM and IC please.

[regenade]

Here is the new Powercolor PCS+ HD 4870 1GB. They have changed from the AMD reference PCB to some other LF R77F PCB. Here is some pics. It will be great if some one has any idea abt VGPU mod or the measure points at least