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Old September 16, 2010, 07:47 PM
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Join Date: Sep 2010
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Exclamation ati 5870 overclocking

I own a sapphire radeon 5870 reference spec.
I got it to 1.05ghz on the core and 1325mhz memory just fine but i quit 3d mark 06 before i could get the scores doh!
then i pushed it to 1.061 without touching voltage and my baby froze :(
going to run 3d mark all the way thru to see if i get a higher score :)
on stock settings i get 22000-23000 score.

anyone else out there doing 5870 overclocking? whats your results?
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Old September 21, 2010, 05:34 PM
Avid6eek's Avatar
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What utility are you using for the overclocks? If you use MSI Afterburner you'll be able to adjust your GPU voltage (assuming you are using a reference design 5870). That should help with your core overclocking.
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Old September 21, 2010, 07:14 PM
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2 options, back down the OC a bit to finish the bench or give it some more voltage.

if you want an advice, start with overclocking core only then when this is done, OC the mem. Doing both at the same time can be confusing a bit sometimes on which one is causing problems.

i usually do it this way:

CORE
1.start stock volt stock voltage, run bench and not score
2.OC +50mhz and rerun bench everytime and note score(rinse and repeat)
3.When you get a crash don't touch frequency, give 50mv more and retry
IF PASS: go back to no 2
IF FAIL: add another 50mv and retry

NOTE:
check temps when adding voltage, if temps get too uncomfortable stop adding voltage.

MEM
1.bring back core to default speed and voltage to default value
2. +50mhz and run bench note score (rinse and repeat)
3. sometimes GPU mem will start displaying wierd texture/lines/polygon that means you have pretty muhc find you max ram OC.

once you have a rough picture of what your card can do, you proceed with fine tuning, using 10mhz increment instead of 50mhz between the last stable frequency and the one where it started crashing.

i always take note of the score because with a GPU when you're coming close to absolute max OC with the cooling you're using, score can/will go down instead of rising, that means you found the max OC within 50mhz.

crash = slighty too much OC
froze = way too much OC
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Last edited by mkultra; September 21, 2010 at 07:26 PM.
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Old September 21, 2010, 09:42 PM
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thats great, i was easily getting 1050 on the core but when i pushed the memory it was crashing then i gave up a couple days ago. but video memory is a huge bottle neck! i budged it up to 5.4ghz and my fps went up considerably. it didnt do that when i pushed the core.
i use afterburner for fan and voltage control and the amd gpu tool for frequencies and blackbox to confirm the speeds and temps.

so if i'm correct i went to 1050 on the core and 5.4ghz on the mem and ran mark06 fine i pushed the mem a tad more and it crashed :(
i need to find time to redo that setup and record the final scores :D
that's considerably faster than a stock 5870 :)
i must have a good chip no?
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Old September 21, 2010, 10:01 PM
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Running the ASUS firmware on an HIS reference card

1050 / 1350 @ 1.3v underwater = 20288 in 3dmark vantage. I haven't run 3dmark06 yet. Peak temp = 42.5 *C

The weird thing is though, that it can run kombustor, atitools artifact checker, 3dmark vantage, games @ 1920x1200 just fine. BUT, when doing 3D modeling in autocad or google sketchup, it will sometimes freeze up when orbiting around a complex part..... So I ended up scaling it back to 1000 / 1250 to keep the CAD software happy.

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