Overclock.net › Forums › Graphics Cards › AMD/ATI › ATI Drivers and Overclocking Software › 7970 Crossfire (REferance) and overclocking, Any tips?
New Posts  All Forums:Forum Nav:

7970 Crossfire (REferance) and overclocking, Any tips?

post #1 of 3
Thread Starter 
So i am about to get my second 7970 its infact on it's way here, Should get here relativly soon, but i won't be able to water cool it for sometime, purely because i couldn't afford a second waterblock, Besides the card runs cool and my case still has PLENTY of positive air flow for the second card to breathe on (Since it will be on the bottom it will have full access to plenty of air) the top one will have water cooling so thats meh.


Any tips on overclocking them(aswelll as what software to use)? when i used GTX 460's, I had gotten them both 100% stable at 920mhz, but found that i required additional voltage for stability when using SLi, will i need additional voltage for crossfire, any specific programs to use, My current 7970 hits 1200 with a very tiny, bump in Core voltage, but it refuses to do above 1200 without artifacts (I need to get around to using the asus bios)
Edited by Rayleyne - 4/16/12 at 11:04pm
MEGATRON
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core i7 4710MQ P170-SM-A Nvidia GTX 980M @ 1470mhz 32GB DDR3L 1600mhz 
Hard DriveHard DriveHard DriveOptical Drive
Samsung SSD 840 EVO Msata 250GB SanDisk SDSSDX120GG25 HGST 1TB Blu-Ray 
CoolingOSMonitorKeyboard
OverCharged Cage fans Windows 8.1 + Virtual Machines Modified 1080P glossy IPS 60hz Stock 
Power
240 Watt Brick 
  hide details  
Reply
MEGATRON
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core i7 4710MQ P170-SM-A Nvidia GTX 980M @ 1470mhz 32GB DDR3L 1600mhz 
Hard DriveHard DriveHard DriveOptical Drive
Samsung SSD 840 EVO Msata 250GB SanDisk SDSSDX120GG25 HGST 1TB Blu-Ray 
CoolingOSMonitorKeyboard
OverCharged Cage fans Windows 8.1 + Virtual Machines Modified 1080P glossy IPS 60hz Stock 
Power
240 Watt Brick 
  hide details  
Reply
post #2 of 3
Just use the latest afterburner and unlock the clocks with the -xcl command.

  • First right click your afterburner shortcut and go to properties.
  • Then at the end of the target field put -xcl (make sure there is a space before the -).
  • Apply and then start the program. You should get a message saying the clocks have been altered.
  • Restart PC and then remove the -xcl from the shortcut.
  • Start program.

In Settings:

  • Tick box's in settings to unlock voltage (don't force constant voltage).
  • You will also want to set your cards default voltage (graphic processor type). The best way to do this is to use GPUz and right click on the top left hand corner then select "read ASIC quality". Then use this chart to see what your default voltage is:

    up to 2F90 (up to 75% quality) - 1.1750V
    up to 34D0 (up to 80% quality) - 1.1125V
    up to 3820 (up to 85% quality) - 1.0500V
    up to 3A90 (up to 90% quality) - 1.0250V

  • Increase the power limit slide at the bottom to +20%.

All this may sound long winded but it really is quite straight forward.

I have tried every program available, more than once, in search of the highest and most stable overclock. Afterburner, using this method, wins hands down!

Some people may say to enable unofficial overclocking in the Afterburner config file but I would avoid this method. I used to do it this way and was sceptical when I was told the -xcl method was better. After now using the -xcl method I will never go back to unofficial overclocking. -xcl is much more stable and I can achieve higher clocks. Not by much mind but it is an improvement.

Depending what driver you are using you may encounter certain issues. All issues can be resolved though so if you have any, post back here and we should be able to rectify.

One more thing. I intially flashed to the ASUS BIOS when these cards first came out to get the higher clocks. As far as I am aware the -xcl method removes the need to flash to the ASUS BIOS. Not 100% on that but worth giving a try before unnecessarily flashing your BIOS.
Tevatron K
(15 items)
 
 
CPUMotherboardGraphicsRAM
2600K @ 4.8ghz Z77 Sabertooth R9 290 8GB Samsung 30nm @ 1866mhz 
Hard DriveHard DriveOptical DriveCooling
M500 240GB SSD 3x 3TB HDD's Sony DRU-V200S Custom water cooling 
OSMonitorKeyboardPower
Windows 7 64bit QNIX 27" 1440p @ 96Hz Ducky 1008 BeQuiet 1200w 
CaseMouseMouse Pad
HAF 932 Logitec G5 Table top 
  hide details  
Reply
Tevatron K
(15 items)
 
 
CPUMotherboardGraphicsRAM
2600K @ 4.8ghz Z77 Sabertooth R9 290 8GB Samsung 30nm @ 1866mhz 
Hard DriveHard DriveOptical DriveCooling
M500 240GB SSD 3x 3TB HDD's Sony DRU-V200S Custom water cooling 
OSMonitorKeyboardPower
Windows 7 64bit QNIX 27" 1440p @ 96Hz Ducky 1008 BeQuiet 1200w 
CaseMouseMouse Pad
HAF 932 Logitec G5 Table top 
  hide details  
Reply
post #3 of 3
Thread Starter 
Well i've got my second 7970 on the way, Little bummed i couldn't afford to waterblock it straight away unlike my first 7970, But eh, We shall see how things go, the 7970 ran pretty cool on the ref cooler
MEGATRON
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core i7 4710MQ P170-SM-A Nvidia GTX 980M @ 1470mhz 32GB DDR3L 1600mhz 
Hard DriveHard DriveHard DriveOptical Drive
Samsung SSD 840 EVO Msata 250GB SanDisk SDSSDX120GG25 HGST 1TB Blu-Ray 
CoolingOSMonitorKeyboard
OverCharged Cage fans Windows 8.1 + Virtual Machines Modified 1080P glossy IPS 60hz Stock 
Power
240 Watt Brick 
  hide details  
Reply
MEGATRON
(13 items)
 
  
CPUMotherboardGraphicsRAM
Core i7 4710MQ P170-SM-A Nvidia GTX 980M @ 1470mhz 32GB DDR3L 1600mhz 
Hard DriveHard DriveHard DriveOptical Drive
Samsung SSD 840 EVO Msata 250GB SanDisk SDSSDX120GG25 HGST 1TB Blu-Ray 
CoolingOSMonitorKeyboard
OverCharged Cage fans Windows 8.1 + Virtual Machines Modified 1080P glossy IPS 60hz Stock 
Power
240 Watt Brick 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
Overclock.net › Forums › Graphics Cards › AMD/ATI › ATI Drivers and Overclocking Software › 7970 Crossfire (REferance) and overclocking, Any tips?