Kamikaze127

When I first got my HD4850 - I couldn't Overclock the memory past 1100Mhz.
Well now I know how - and I will let you in on a secret that will add 10-12Gb/s to your memory

[Note- Apparently this works well for the HD4870 too.]


First things first - Open CCC [Right click on your desktop]




Once In Catalyst Control Center - Unlock your card's overdrive and proceed to Auto-Tune.




Select HD4850 and click "run" - You should see this:




Let Auto-Tune take its time making sure everything is stable. My resulting clock - 690/1180




With GPU.Z in the shot




Now let me show you how much you have gained -

STOCK


Auto-Tuned


63.6Gb/s to 75.5Gb/s.
Quite an improvement


Conclusion -
NCspecV81 and I have confirmed that CCC slightly bumps the voltage up on the memory when it autotunes. This works out well for us - as little effort leads to big gains. Note that your card may clock higher or lower than mine and If it is unstable at what CCC Auto-Tunes - Take it down by 10MHz increments until it is stable.

Happy overclocking

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.kami
Validations|AMD Phenom X4 9950+|3.2GHz|3.4GHz|AMD Athlon64 X2 5600+|3.2GHz
Build logs|Kamikaze127's Tempest|The Assassin
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NCspecV81

According to my DMM voltage is slightly bumped when using autotune on the memory. Mine finally settled at around 2.0v's up from 1.85v's.

TripleC

awsome, i shall let it autotune me card too

__________________

Kamikaze127

I hope to see some results
Let me know how it goes.

__________________
.kami
Validations|AMD Phenom X4 9950+|3.2GHz|3.4GHz|AMD Athlon64 X2 5600+|3.2GHz
Build logs|Kamikaze127's Tempest|The Assassin
Other communities|NZXT Tempest User Community|Last.fm|FlickR
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TripleC

yeah autotune works

http://www.techpowerup.com/gpuz/72hme/ (PROOF)

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criminal

I am guessing it does the same for the 4870 as well? I can't get my memory past 1050 with artifacting.

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Alabama Overclocker

**The Prolimatech Club**

5800 Ownerz Club

gamervivek

lol as if a 4870 needs the extra speed
nice find,repped

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gamervivek has left the building,goodbye overclock.net we love you.

A 60 ton angel falls to the earth

passive aggressive bull$hit

Ati Tray Tools vs CCC

adam144

This is mine...

GPU-Z Validation

690/1138

Something that interests me about the voltage is, when you change the fan speed in the xml file, there are voltage targets in there.. I wonder if changing those changes the voltage to your card, or if they're just there for the sake of being there

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[center][FONT="Verdana"]Upgrades
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Kamikaze127

I wonder that as well - but I don't feel comfortable touching them

__________________
.kami
Validations|AMD Phenom X4 9950+|3.2GHz|3.4GHz|AMD Athlon64 X2 5600+|3.2GHz
Build logs|Kamikaze127's Tempest|The Assassin
Other communities|NZXT Tempest User Community|Last.fm|FlickR
Pictures|Me|The Assassin|Both

adam144

Rofl, I artifact tested mine in ATI Tool and as soon as I clicked the button, kablam, dozens of artifacts on the cube Gonna have to step back a little

__________________
[center][FONT="Verdana"]Upgrades
- Team Elite 4GB PC-6400 - installed!
- Sapphire HD4850 512mb - installed!
- 500gb 7200.10 - installed!