Aznboy1993

What is the maximum safe voltage you can increase on the 4890? I've gotten to 975MHz core and 1050MHz memory on 1.35V. I want to try to hit 1000MHz but I can't do it on 1.35V, I can do a BIOS edit to increase the voltage but I was just wondering what is the max safe voltage I can increase to. I've heard 1.4V is good but is that true?

BradleyW

Edit the bios to 1.4volts for the vcore. That will give you 1GHz. As far the memory, i don't have a clue how to edit the video memory within the bios editing tool. Do you know how to do it?

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Aznboy1993

Nah I don't think it's possible to edit the VRAM voltage (at least with RBE). I'll go ahead and edit it to 1.4V, but one question. When you go and edit the voltage do you only change the voltage for the optimal performance clock info (ie. for mine it is clock info 03 and 09) or all of them? Screenshot below...

Aznboy1993

bump?

rico2001

@OP
1.45v on the core

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Aznboy1993

OK I just set edited the BIOS using RBE and set the voltage for Clock info 03 and 09 to 1.4 but when I flash it and reboot into Windows it doesn't show 1.4v (instead it shows 1.35v) and the clocks are stuck at 900mhz core, 975mhz mem and I cannot move them up or down. What did I do wrong here?

tweakboy

Depends on your cooling. If you have super cooling then it will be kept cool. If you have stock or weak cooling then you will get high temps. One of the gurus here can tell u the safe voltage,, gl

BradleyW

In RBE, click the view/change voltage registers or something like that. A small box will come up with 4 different values. On the end right value, change it to 1.4125 and save/flash the bios. Hey, can you try and give me a hand and find out how to get my vram at 1.3volts perminant by flashing or software. PERMINANT?

Flash to your origional bios, set ccc to default clocks and do the above. Then you can OC.

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Ladiesman101

personally i wouldnt go higher then 1,4V
but if u do
id recommend maybe getting an aftermarket cooler

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BradleyW

The cooler will be fine and 1.37 will run 1ghz easy. 1.4v is a safe voltage.

can anyone help me know?

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