XFX HD 4890 Black Edition: OC-Lock over 1.066 MHz GPU-Clock??

[webwilli]

Hello

i have two XFX 4890 BE with 1.000 MHz GPU-Clock default.


But there is a little problem: i can´t go over 1066 MHz GPU

1066 is benchstable with 1.38 Volt
If i set 1067 and more the cards crash immediately. no 3D-Load.
I test 1.45 volt, but no chance.

I tested each card separate.
ATI Catalyst 9.5 and 9.6
Rivatuner and other programs.
Aircooling and water, but no chance.

Some other people with the XFX BE have this problem too.

Is it a hardware lock?
What can i do??

[SNiiPE_DoGG]

you tried more than 1067?

[webwilli]

yes.

1070
1075
1080

[SNiiPE_DoGG]

I think maybe it is an issue with AMD gpu clock tool (what you are using right?)

[webwilli]

i test Rivatuner and GPUTool.

[giraffen]

I got same problem. 1066Mhz without problems, 1067Mhz = Green screen

[Sgt.McRuff]

Try contacting xfx see if they have a bios update.

[dinos22]

who says you are actually giving it 1.45vcore
check your DMM

[webwilli]

Try contacting xfx see if they have a bios update.

done. But no new bios

who says you are actually giving it 1.45vcore
check your DMM

good idea. i will check it later.

[giraffen]

who says you are actually giving it 1.45vcore
check your DMM

I dont think it is the problem. It also make green screen in 2D