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Radeon HD 4850 Voltage?

post #1 of 5
Thread Starter 
Hi,

My HD 4850 runs at 1.05V when idling, and 1.08V at full load. 1.08 seems to loo low, and I have tons of problems (Killing Floor runs at 20fps, the motherboard does not recognise the card when cold-booting...).

BTW: THe card is a gainward golden sample, runs at 700MHz instead of 625.

Thanks!
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post #2 of 5
It's not "too low", graphics cards work a little over 1V. That said I used my 4850 @1.15V under load at 800MHz, so if you have good cooling you could try modding your BIOS to work at higher clock/voltage.

Still, if the card doesn't work at its stock settings it can have some problems. If you still have warranty you should try a RMA.
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post #3 of 5
Thread Starter 
The card is completely stable, once the computer boots. Most games run fine, except some old games and Killing Floor.

I voided the warranty, there was a sticker over one of the heatsink screws, I removed it to change TIM a while ago. In any case, they warranty has expired smile.gif
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post #4 of 5
The thing is the 4850 has 3 significant voltage/speed modes and a few more that aren't so important. The 3 main are: boot, idle and load. Using a soft such as RBE to open the BIOS (winflash to read/write it) you'll see all the speed/voltage pairs for your card. You can try to lower the BOOT clock speed or to increase BOOT voltage a little bit. The "boot" mode is selected only at startup until the windows driver takes over, but for some reason for my 4850 it was clocked the same as the 3D mode for no reason I can imagine, you're not likely to need that amount of speed to render the POST screen.

My advice: download Winflash and save the GFX BIOS. Use RBE to open it and lower boot clock speed by 50MHz and save the BIOS. Then if you're sure of what you've done use Winflash to put the modded BIOS back on the card and restart. If unsure post some screenshots here of the old and new BIOS settings.

cheers
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Centurion
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post #5 of 5
Thread Starter 
I see I have 4 powerplay states: boot, UVD and two others with the same name...

As you can see in the table, there's not voltage set for the boot clock (#00), and I can't find the voltage for load (1.08). Is this normal?
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