5870 running at 421 mHash/sec! - page 5.

eleuthria

legendary

Activity: 1750

Merit: 1007

Quote from: trentzb on April 19, 2011, 10:12:53 PM

I am interested in all the details you care to share. If you can measure actual power consumption that would be interesting to know. Is this a standalone miner/card? What driver/sdk are you using?

The whole computer is consuming 272 watts right now with the card at 1000 mhz. I'll be able to give an "isolated" card power consumption this weekend when I get the 2nd 5870, by taking the total PC consumption less the 272 I already know it consumes.

It's running Ubuntu 10.10 desktop install. ATI Stream SDK 2.1. The ATI driver is Catalyst 11.3.

trentzb

sr. member

Activity: 406

Merit: 251

Quote from: rezin777 on April 19, 2011, 10:24:13 PM

What I really wish I could do is reduce memory voltage with a soft mod. It's possible to play with VTT registers via BIOS but from what I've read that isn't exactly memory voltage.

I am not sure about memory voltage control via AMD's ADL but core voltage, mem/core clock, fan control is there. I would assume ADL is what AMDOverdriveCtrl is using.

I hacked up a tweak program using ADL (before I ran across AMDOverdriveCtrl) but found BIOS mods somewhat easier.

rezin777

full member

Activity: 154

Merit: 100

Quote from: AmpEater on April 19, 2011, 10:21:11 PM

How do you manage 1000MHz, my many 5870 in ubuntu wont accept any clock setting over 900MHz, at which they are perfectly stable.

Possible BIOS limitation.

rezin777

full member

Activity: 154

Merit: 100

Quote from: eleuthria on April 19, 2011, 09:57:37 PM

Has anyone else been pulling these numbers (or better) on a 5870 with just stock cooling? I'm curious why the wiki numbers are quite a bit less.

Yes, on multiple cards jammed next to each other with stock cooling and stock voltage. My temps average 60 degrees. Core 950 / Memory 300.

I considered adding voltage to the reference boards to go further with the o/c, but that will just increase temperatures and electricity use for what I would guess to be minor gains.

What I really wish I could do is reduce memory voltage with a soft mod. It's possible to play with VTT registers via BIOS but from what I've read that isn't exactly memory voltage.

Zamicol

newbie

Activity: 56

Merit: 0

No, and I wish I knew how you did that. Whenever I underclock my 5870's any lower than 900 it affects the hashrates. I get about 350,000 running @ 940 @ ~70 degrees C.

I'm running Ubuntu, and I have Gigabyte 5870's.

And thanks for mentioning AMDOverdriveCtrl. That so much better than what I was using before!

AmpEater

full member

Activity: 232

Merit: 250

How do you manage 1000MHz, my many 5870 in ubuntu wont accept any clock setting over 900MHz, at which they are perfectly stable.

trentzb

sr. member

Activity: 406

Merit: 251

I am interested in all the details you care to share. If you can measure actual power consumption that would be interesting to know. Is this a standalone miner/card? What driver/sdk are you using?

eleuthria

legendary

Activity: 1750

Merit: 1007

Just wanted to share the results of my new mining rig. Original plan was a 6990, but TigerDirect FUBAR'd that order. I ended up getting a 5870 delivered before fixing the 6990 order issue, and I'm amazed at how well its performing.

GPU Overclocked to 950 (stock voltage).
Memory underclocked to 600 (haven't been able to go under that inside linux?).
Fans running at ~50% (2400-2500 RPM out of 5100 according to AMDOverdriveCtrl).
Runs at a steady 65-67C.

That's producing a 362-364 mhash/sec rate of mining (m0mchil's poclbm), which is higher than any of the wiki entries for a 5870. I'm going to slowly drive up the GPU clock rate every few hours to find the sweet spot for power consumption, temperature, and mining rate. So far the 950 clock rate is a better mhash/watt ratio than 850, 900, and 925.

Has anyone else been pulling these numbers (or better) on a 5870 with just stock cooling? I'm curious why the wiki numbers are quite a bit less.

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Update 4/25/11: I switched over to the Phoenix miner 1.1, and now run at 421-423 mHash/sec on all of my 5870s. Clock settings are 975/300, using 0.950 voltage. They're running cooler, sucking less power, and running significantly faster with Phoenix!

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