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Overclocking HD7970 - First timer questions

#1XxTwisted26xXPosted 11/10/2013 8:06:26 PM
Hey guys, this is my first time overclocking. I heard you can gian a increase in performance by 40% on the HD7970 and have looked up some used speeds input into the CCC.

Are these reliable speeds with my current set up and power supply (in signature):

GPU Clock: 1125 MHz

Memory Clock: 1575 MHz

Manua Fan Control: TO max

Power control setting: 20%


Currently, my settings are at:

GPU Clock: 950 MHz

Memory Clock: 1425 MHz

Manua Fan Control: Automatic

Power control setting: 0%
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Steam: xxtwisted26xx
Not the best but it's my first: i5-3350P (CPU) Memory 8GB (RAM) Radeon HD 7970 (GPU) Rosewell 650 (PSU) 120GB King (SSD) Asus VN247HP 1ms
#2XxTwisted26xX(Topic Creator)Posted 11/10/2013 8:26:09 PM
People are saying that putting fan control to 100% will destroy the fans? And that you should leave fan contorl on automatic in CCC?

Set my settings to

GPU: 1125 MHz

1575 MHz

Power: 20%

Hopefully my GPU doesnt implode
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Steam: xxtwisted26xx
Not the best but it's my first: i5-3350P (CPU) Memory 8GB (RAM) Radeon HD 7970 (GPU) Rosewell 650 (PSU) 120GB King (SSD) Asus VN247HP 1ms
#3urtvPosted 11/10/2013 8:44:40 PM
download heaven or valley and run them a few times.raise power to max.keep raising speed/memory till it crashes
#4XxTwisted26xX(Topic Creator)Posted 11/10/2013 9:12:11 PM
urtv posted...
download heaven or valley and run them a few times.raise power to max.keep raising speed/memory till it crashes


A good temperature to keep the GPU is 60 to 80C right?
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Steam: xxtwisted26xx
Not the best but it's my first: i5-3350P (CPU) Memory 8GB (RAM) Radeon HD 7970 (GPU) Rosewell 650 (PSU) 120GB King (SSD) Asus VN247HP 1ms
#5XxTwisted26xX(Topic Creator)Posted 11/10/2013 9:21:05 PM
XxTwisted26xX posted...
People are saying that putting fan control to 100% will destroy the fans? And that you should leave fan contorl on automatic in CCC?

Set my settings to

GPU: 1125 MHz

1575 MHz

Power: 20%

Hopefully my GPU doesnt implode


I set it to those settings and I played Bioshock 2 maxed at 60 fps with some stutterign to 50 fps. I exited and then my screen just became a wish wash of hundreds of different colored lines... had to restart computer.
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Steam: xxtwisted26xx
Not the best but it's my first: i5-3350P (CPU) Memory 8GB (RAM) Radeon HD 7970 (GPU) Rosewell 650 (PSU) 120GB King (SSD) Asus VN247HP 1ms
#6XxTwisted26xX(Topic Creator)Posted 11/10/2013 9:40:13 PM
Says AMD Driver has stopped working :O

Lowered everything by 100 MHz
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Steam: xxtwisted26xx
Not the best but it's my first: i5-3350P (CPU) Memory 8GB (RAM) Radeon HD 7970 (GPU) Rosewell 650 (PSU) 120GB King (SSD) Asus VN247HP 1ms
#7XxTwisted26xX(Topic Creator)Posted 11/10/2013 11:02:42 PM
Anyone have suggested clockspeeds to set it to?
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Steam: xxtwisted26xx
Not the best but it's my first: i5-3350P (CPU) Memory 8GB (RAM) Radeon HD 7970 (GPU) Rosewell 650 (PSU) 120GB King (SSD) Asus VN247HP 1ms
#8SnadadosPosted 11/10/2013 11:57:27 PM
Linus Tech Tips has a doc showing what overclocks they were able to get with the various cards they test.

https://docs.google.com/spreadsheet/ccc?key=0AmLKAgEko3SAdHFtby1jNTFvaTF2UHhaMzdMQ0FNM2c&usp=sharing#gid=0

Each card can be different and your card may handle a higher overclock or it is possible it can't be overclocked as high.
The only way to know for sure is trial and error.

Their card they have on the google doc looks to be a reference card and you are usually able to get better overclocks from the various manufacturers' card as they usually have better coolers on them
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Have you accepted Raspberyl as your loli and savior?
#9Auron_59261Posted 11/11/2013 12:34:55 AM(edited)
Make sure you're using Afterburner for overclocking and not CCC. Once you download it, go into the settings and allow voltage control. You may need to knock the juice up a bit to get stable at those higher core clocks. For example, my 7970 is at 1.25V @ 1200 MHz Core and 1600 MHz Memory. Fan speed is around 50% and usually stays around 60C under full load, but I use my own dynamic fan preferences so that it idles at around 10% when not gaming.
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i7 3770k @ 4.5GHz [] HIS IceQ X^2 7970 |1200|1600|3GB| [] 16GB Ripjaws Z 1866 [] ASRock Z77 Extreme4 [] 250GB Samsung 840 [] 2TB Barracuda [] CX 600 PSU [] H110
#10Auron_59261Posted 11/11/2013 12:10:02 AM
urtv posted...
download heaven or valley and run them a few times.raise power to max.keep raising speed/memory till it crashes


Terrible idea IMO. Those benchmarking programs have been known to remain stable under higher clocks that would normally crash. I have run at 1350 MHz and 1800 MHz in Haven, but crash almost immediately with any game. I run stable in everything else at 1200/1600.

I usually use a demanding game to test my overclock out. Crysis 3, Far Cry 3, Metro, or Battlefield 3/4 are good for testing.
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i7 3770k @ 4.5GHz [] HIS IceQ X^2 7970 |1200|1600|3GB| [] 16GB Ripjaws Z 1866 [] ASRock Z77 Extreme4 [] 250GB Samsung 840 [] 2TB Barracuda [] CX 600 PSU [] H110