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Overclocking a 6870

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April 23, 2011 10:46:48 AM

Hello,

Alright, so I recently purchased a Sapphire HD 6870 GPU and I was contemplating on overclocking the card. I've never overclocked or tampered with any settings like this before, so it's a relatively new process to me. I want to see how far I can overclock my GPU using the Sapphire TRIXX overclocking tool (without causing excessive heat). Right now my core clock is running at 900MHz/1050 with the GPU voltage at 1175. I know there isn't a 'safe overclock speed' but what increments should I move the clock speed up, 5MHz, 10MHz? Before testing it using Heaven 2.5/Vantage. I know tampering with the voltage could cause serious problems, so for now, I'm going to leave that at the factory setting. Is there any point in overclocking the 6870? The main reason why I am doing this, is because I get relatively low FPS in games such as Black Ops and mainly Crysis 2.

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a b U Graphics card
a b K Overclocking
April 23, 2011 12:30:46 PM

OC'ing a GPU in general won't lead to dramatic improvements. Just look at the numbers; 900Mhz core clock. Let's say you are able to hit 1000Mhz, that's 11%. So, if Crysis 2 is playing at 40FPS, you'll now hit 44FPS.


What's the MAX you could hope for : 47% (we'll if your LN2 cooled to -180 Degrees...)

MSI's new HAWK series of graphics cards has received universal acclaim from both the media and overclocking aficionados. The HAWK series not only has top-notch specifications but also comes with a number of MSI-exclusive performance-enhancing features. Using the latest MSI R6870 HAWK, overclocking guru THC from the Danish ODOC team achieved a jaw-dropping GPU frequency of 1325MHz last week with the help of LN2 cooling at -180 degrees.

Read more: http://vr-zone.com/articles/msi-r6870-hawk-breaks-world...


That said I increase 20Mhz at a time using stock voltages till it crashes running FurMark or Heaven/Vantage... then back off 10Mhz and play for a while, a couple days, to see if it's truely stable. If it crashes, back off another 5Mhz.

Once you happy with the stock voltage OC, you can bump up the voltage to 50% of the max the tool allows. Then bump you clocks up 20Mhz at a time till crashes, same process as above. Keep an eye on your temps. I like to say under 85C in a FurMark run myself.
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April 25, 2011 2:29:09 AM

jb6684 said:
OC'ing a GPU in general won't lead to dramatic improvements. Just look at the numbers; 900Mhz core clock. Let's say you are able to hit 1000Mhz, that's 11%. So, if Crysis 2 is playing at 40FPS, you'll now hit 44FPS.


What's the MAX you could hope for : 47% (we'll if your LN2 cooled to -180 Degrees...)

MSI's new HAWK series of graphics cards has received universal acclaim from both the media and overclocking aficionados. The HAWK series not only has top-notch specifications but also comes with a number of MSI-exclusive performance-enhancing features. Using the latest MSI R6870 HAWK, overclocking guru THC from the Danish ODOC team achieved a jaw-dropping GPU frequency of 1325MHz last week with the help of LN2 cooling at -180 degrees.

Read more: http://vr-zone.com/articles/msi-r6870-hawk-breaks-world...


That said I increase 20Mhz at a time using stock voltages till it crashes running FurMark or Heaven/Vantage... then back off 10Mhz and play for a while, a couple days, to see if it's truely stable. If it crashes, back off another 5Mhz.

Once you happy with the stock voltage OC, you can bump up the voltage to 50% of the max the tool allows. Then bump you clocks up 20Mhz at a time till crashes, same process as above. Keep an eye on your temps. I like to say under 85C in a FurMark run myself.


Thanks for the response.

Just say I decided to go up in 10MHz increments should I move both core clock and memory clock? Or just the core clock?
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a b U Graphics card
a b K Overclocking
April 25, 2011 2:52:48 AM

Just the Core Clock, memory specs are usually really tight. So, there isn't much room for OC'ing the RAM. Stick with the Core CLock for now....

You can fine tune the RAM once you have your best stable Core setting....

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April 26, 2011 12:53:02 AM

Best answer selected by MikeyJ.
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April 26, 2011 12:53:52 AM

Thanks for your help jb6684, I have a better understanding of what to do now.

Once I finish with my OC I will post back with my results.
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July 27, 2011 11:58:26 AM

so what's the results? jus got dual-fan XFX 6870 but havent installed yet, wondering what other's have found with these Radeons.
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August 1, 2011 1:37:59 PM

XFX Dual-Fan 6870
Running Metro 2033 for last 2 hrs @ core: 950MHz \ mem: 1140MHz.
DX11 on, settings Very High. slightly more consistent frame rates.
Fans @ 77% never passed 65°C.
gonna try a few more games and then up it a little more...
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August 1, 2011 2:59:12 PM

GObonzo said:
XFX Dual-Fan 6870
Running Metro 2033 for last 2 hrs @ core: 950MHz \ mem: 1140MHz.
DX11 on, settings Very High. slightly more consistent frame rates.
Fans @ 77% never passed 65°C.
gonna try a few more games and then up it a little more...


Did you increase your fan speed and how much?
Thanks the noob
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August 1, 2011 3:01:42 PM

GObonzo said:
XFX Dual-Fan 6870
Running Metro 2033 for last 2 hrs @ core: 950MHz \ mem: 1140MHz.
DX11 on, settings Very High. slightly more consistent frame rates.
Fans @ 77% never passed 65°C.
gonna try a few more games and then up it a little more...


P.S. Did you purchase the duel fan aftermarket cooler?
thanks the noob
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September 17, 2011 12:52:26 PM

Have upped it to 975MHz / 1160MHz and still havent had any crashes. Dude's crazy sayin core @ 1000MHz would only give 10% increase in fps. I believe the results are slightly more exponential than that. I'm getting 10-20 more fps in Metro 2033 and Crysis 2 than I do at stock speeds (from around 40fps to around 60fps). Using MSIAfterburner I have the fan speed curve 30°-30% to 60°-100%, hasn't got above 61° since.
Does it really take you this long to overclock your card? We're still waiting for your results MikeyJ.
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March 8, 2012 2:01:24 AM

GObonzo said:
Have upped it to 975MHz / 1160MHz and still havent had any crashes. Dude's crazy sayin core @ 1000MHz would only give 10% increase in fps. I believe the results are slightly more exponential than that. I'm getting 10-20 more fps in Metro 2033 and Crysis 2 than I do at stock speeds (from around 40fps to around 60fps). Using MSIAfterburner I have the fan speed curve 30°-30% to 60°-100%, hasn't got above 61° since.
Does it really take you this long to overclock your card? We're still waiting for your results MikeyJ.


For posterity sake:

using an MCW-60, my reference release week MSI card does 1130 @ 1.3 volts and 1160 mem.
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March 8, 2012 2:49:54 AM

tcclaviger said:
For posterity sake:

using an MCW-60, my reference release week MSI card does 1130 @ 1.3 volts and 1160 mem.
been keepin it @ 950MHz/1200MHz 1.17v
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