Less VDDC when overclocking 7970

[grandpatzer]

So I'm using Kombustor to test out clocks.

Without touching volts when I run 1125/1375 gpu-z reports VDDC 1.051 (starts 1.057 then goes to 1.051)

Without touching volts when I run 925/1375 gpu-z reports VDDC 1.057.

This is 21% core overclock.

This give 19% more fps in Kombustor.

Question:

 

[S_I_N]

just the power phases doing their thing bios is set to 1.057 for stock so most likely its reporting just that. While when you enable overclocking it handles it differently. but if you can get that kinsa oc on stock volts looks like ya won the lottery on that one

 

[KING_OF_SAND]

Before upping the volts, up the wattage through CCC.

 

[grandpatzer]

just the power phases doing their thing bios is set to 1.057 for stock so most likely its reporting just that. While when you enable overclocking it handles it differently. but if you can get that kinsa oc on stock volts looks like ya won the lottery on that one

Well during gaming I got loads of artifacts almost immediately so I guess I need to run kombustor longer or try something else like Unigine.

Wierd thing is after artifact I put back to stock everything and still artifacts, after restarting computer finally the artifacts disappeared.

Also seems like 20% powertune does nothing as far as I can see.

 

[KING_OF_SAND]

Well during gaming I got loads of artifacts almost immediately so I guess I need to run kombustor longer or try something else like Unigine.

Wierd thing is after artifact I put back to stock everything and still artifacts, after restarting computer finally the artifacts disappeared.

Also seems like 20% powertune does nothing as far as I can see.

once you artifact once you need to restart your computer.

 

[grandpatzer]

once you artifact once you need to restart your computer.

I really have to restart each time?

Ive heard Unigine is more demanding then OCCT/Kombusto/furmar as those are limited?

So I increase 25-50mhz on core or memory then run a loop of Unigine until artifacts, then put it down 25mhz and run 30min of Unigine, sound like a plan?

 

[KING_OF_SAND]

I really have to restart each time?

Ive heard Unigine is more demanding then OCCT/Kombusto/furmar as those are limited?

So I increase 25-50mhz on core or memory then run a loop of Unigine until artifacts, then put it down 25mhz and run 30min of Unigine, sound like a plan?

YUP. almost EVERY TIME after you get artifact, it means your driver is now unstable, it may not have fully crashed and recovered but it became unstable and partially crashed.