700mhz wall on HD4850 is smashed.

[Rattle]

these cards are fun, i went from not being able to go over 660/1050 ish on stock volts and bios, to being able to do 685/1075 with an msi bios that was stock but gave more volts than the visiontek bios. So i pencil modded and played with 750/1150 a while, then out of curiosity i reversed everything, at 1.14 loaded on both gpu i can now do 700 stable and 2.06-2.1 on the mem gets me 1100 also. I think those are all almost stock voltages now. maybe a wee bit of burn in happened? I am new to volt modding of any kind and couldnt get my cards to get more than 1.25 ish volts and I couldnt do 750 completely stable. when i went back to stock everything they semm to clock higher than before. maybe I need a softer #2 lol the pencil I mean.

[zaraza]

well im at 825 and 1150 on the ram. I think ill stop there. dont need to push it farther. Dunno if i can. I am going to sit back and play games for next week and see how it responds

[D749]

Using stock cooling with a custom BIOS (voltage @ 2.1, fan bumped up) the best I can do is 700/993 with my two VT 4850s in CF. Anything higher, especially in the memory department and I start to notice minor artifacting in 3DMark Vantage. I seem to have horrible luck when it comes to getting video memory to overclock. Granted, I haven't had enough time to test the second card by itself so that could be the sole culprit.

[gurusan]

good stuff ehh

[WiZARD_hun]

I can take care of the checksum error for you.

<- e-mail your BIOS to me if you'd like it fixed

thanks, now I'm running it at 725/1150, it looks fine.
maybe the GPU could do more than that, but 750 was too much...

now I'm waiting for rivatuner, and I want to find the max stable, and than flash it. Now I'm tired of flashing and rebooting...

[laragirl83]

Hm, if I save my BIOS to file, and open it, the default BIOS I can see the voltages!
Also downloaded gurusan's ROM, if I open it with RBE, i can also see the voltages.
But if I try to set the voltages, and save the ROM file, next time If i open it with RBE there are only "---" signs where the specific voltages numbers should be... why?

This is how it should be:


This is what I got...

[WiZARD_hun]

Hm, if I save my BIOS to file, and open it, the default BIOS I can see the voltages!
Also downloaded gurusan's ROM, if I open it with RBE, i can also see the voltages.
But if I try to set the voltages, and save the ROM file, next time If i open it with RBE there are only "---" signs where the specific voltages numbers should be... why?

control panel/regional settings >> English (UK)

BTW does somebody know, if I flash a bios with "---" voltage, how much will the card get? (I was in a hurry and flashed "---" but it worked perfectly, even 3dmark was okay at 725/1150)

[alexio]

If all profiles read --- it shouldn't work at all, or maybe the driver will default to 3D vGPU. If only the 3D vGPU are read --- this means these values are controlled by the driver.

[WiZARD_hun]

If all profiles read --- it shouldn't work at all, or maybe the driver will default to 3D vGPU. If only the 3D vGPU are read --- this means these values are controlled by the driver.

interesting.
every profile was ---

[alexio]

interesting.
every profile was ---

English (UK) was set? If not this may be the reason for the ---. Without vGPU edits at least the cards should work fine even when the regional settings is not English(UK). In other words: nothing changed by the user = nothing changes.

[WiZARD_hun]

it was hungarian, I forgot to set to english(UK).

[Alex-Ro]

So anyone can confirm that changing voltage in bios result in real improvements?

[laragirl83]

So anyone can confirm that changing voltage in bios result in real improvements?

For me, it didnt work out well.
I did the 1.263V vGPU change, but no gain in MHz...
By default, it gets 1.084V, and I can run the card @ 660/2100MHz. Fair enough.
So I was like, 1.2V should allow me at least 700MHz GPU speed. But it didnt. Running Vantage, VPU recover...
I dunno why, probably a anti-oc card, for my bad luck.

[weirkved]

why change voltage destroing warranty, when you can do it via bios edition with RBE_111?

[GAR]

Anyone notice the screen flickering when scrolling up fast on a web page??? or is this from crossfire?????

[tvdang7]

Anyone notice the screen flickering when scrolling up fast on a web page??? or is this from crossfire?????

i had that problem but i just downclocked my ram and it stopped.
the flickering didnt affect any performance or anything in games. it was stable.
WIERD

[DemonEyez]

I noticed another thing when scrolling up and down fast on a webpage. I was monitoring the clockspeeds with GPU-Z and noticed that when I scroll up and down fast, the card switches between low 2D (160MHz) and High 3D (830MHz) al lot! Why does it need to be in high 3D mode for just simple webpage browsing?
I noticed the same thing with uTorrent. when this app is openend in a windows the card constantly switches between high and low. (on default, uTorrent shows some realtime graph for download speed and file completion) Does anybody else noticed this? I get the feeling that constant switching about every 1 second causes instability, although the maximum clockspeeds are completely stable.
I can do 830MHz stable with Crysis, 3DMark and Atitool (10 minutes artefact tester) but my system will hang after two or three hours when it was doing nothing but only downloading. (during that time it was switching contantly) the reason of the hang was a BSOD caused by a file named atidag.dll
This happend to me three nights in a row.
Last night I left my rig downloading ( as in previous nights) but this time i minimized the uTorrent window to the system tray, so there was no window active and hence there was no constant switching. Lo and behold, it ran flawlessly the whole night.
Any idea's or comments in this?

[hayat]

Is it posible to change the size of the video memory of a videocard bios

[jimmyz]

Is it posible to change the size of the video memory of a videocard bios

no


if you use a 256 mb card with a 512mb card it will only use the smaller amt automatically.as far as having a bios change the sizee no, it can't do it.

[hayat]

no


if you use a 256 mb card with a 512mb card it will only use the smaller amt automatically.as far as having a bios change the sizee no, it can't do it.

and if i use a 512mb video mem bios on a 256mb card what will happen?

[jimmyz]

and if i use a 512mb video mem bios on a 256mb card what will happen?

the memory is of different types so probably a black screen, I don't really know, I wouldn't want to find out. Just use the bios from the same model as you have. You can modify the bios using RBE 1.1.0 much easier.

[Brother Esau]

and if i use a 512mb video mem bios on a 256mb card what will happen?

You will distinctively Hear.....Snap....Crackle....F**CK You

[AliG]

jimmy you know when that gpu tool will finally come out? It's kinda getting tyring waiting on a way to overclock above 700mhz without the risks of bios flashing or hard modding

[jimmyz]

jimmy you know when that gpu tool will finally come out? It's kinda getting tyring waiting on a way to overclock above 700mhz without the risks of bios flashing or hard modding

A hard mod will most likely be required anyway. the 1165MF (4870)does support voltage increases, but most other chips used don't (from software at least). bios and hardmods for now, so better get good with the iron.

[jzteam]

Hello thi is my first post in this forum, I am writing from Barcelona ( Spain ), I have been following the thread with the help of the google translator, I try to follow your advice
but I do not work for my 2 Asus HD4850, gurusan you can help me, I'm trying to change the bios by yours and i said winflash = do not match the id of the subsystems.
I tried to edit with RBE operating at 160/710 Vgpu 1.2, only this paramewters but not works fine,
nothing else fails start 3dmark06.

Sorry for my grammar and thanks to meet me.