Recommended Voltage for HD4850 (2D-mode)

[Hamlet]

Hello guys.
I've written a German tutorial on how to fix the nasty overheating problem on standard HD4850 cards: http://www.winfuture-forum.de/index.php?showtopic=147726
It includes: making the fan spin more (30% for less heat), lower 2D GPU frequencies (160/500) and undervolting (2D = 0.930V).

Here is my question:
Can you recommend 2D undervolting?
If you do so, I have found out, that 0.89V is not enough to boot Windows, but 0.93V works fine. Would you do the same or would you just skip undervolting and just go for the other 2 modifications?

Please share your mind.
Hamlet

 

[Deleted member 24505]

Just put an accelero s1 on it,you dont need to mess around with the fan speeds then,and it will run cooler.The stock 4850 cooler is a bit cack imho.

I have a xspc full cover water block on mine though,which runs at 28c idle and 37/8c max

 

[Hamlet]

Thanks! But I don't want to mess with my guarantee. Otherwise I'd have bought the Powercolor PCS, but that's too late now - it wasn't yet on the market when I bought my MSI 4850.

Soo... anyone with experience on flashing the standard HD4850 and undervolting it?
Should I do it or leave it be?

 

[Deleted member 24505]

I've had the accelero and a waterblock on mine,but if it fooks up,i will still put the stock cooler back on and rma it.As long as you dont do no hard mods to it you can do the same.

 

[Hamlet]

I'm just not the type for hardmods. I like to have my graphics card working out of the box. If I can improve it by flashing better fan settings + lower 2D frequencies, great, but I won't remove that fan.

Edit: Can this thread be moved to graphics cards?
Sry, first post here... wrong category...

 

[0584]

0.930V is insanely low.

If I set 0.968V with ati tray tools while in windows, the computer crashes in a few seconds.

The lowest I can do is 1.006V. Did you try setting 0.930V with ATT while in windows?

 

[Hamlet]

0.93V works; no problems attached.
BIOS modified with RBE and flashed with winflash.

The only problem I encountered lateley was playing a x264-coded video.
I saw big blocks in the picture.
But this could as well be because of my low-power CPU (X²-3800)

 

[TRIPTEX_CAN]

Can't be the CPU. All ATI HD cards will offload 100% of the decoding work for HD content. Try flashing the 2D clock lower. Mine are @ 300Mhz in 2D... your 2D clock might be too high for the voltage you chose.