5870 memory speed without causing crashes - page 2.

DeathAndTaxes

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Gerald Davis

Quote from: ZodiacDragon84 on January 07, 2012, 10:58:29 PM

noob question, isn't higher memory a good thing?

No. Bitcoin requires negligible memory or bandwidth. Higher memory tends not to improve performance but uses power and produces heat. Sometimes lowering memory can actually slightly improve performance but the main reason is to reduce heat/power and alllow higher overclocking of core.

The best GPU for mining would be a quad 5870 on only a PCIe 1x slot w/ a couple MB of memory to reduce cost. I doubt AMD will build that one though.

ZodiacDragon84

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The king and the pawn go in the same box @ endgame

noob question, isn't higher memory a good thing?

chungenhung

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No dummy plugs, no extending desktop.
I am trying to install the latest driver now.

DeathAndTaxes

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Gerald Davis

Quote from: Eveofwar on January 07, 2012, 10:51:32 PM

Interesting that you would see artifacts on the 5830, if the 5870 is the "suspect"...I was under the impression that artifacts are supplied from the card that the monitor is attached to.

I didn't catch that in first reading of it. Yeah weird the 5830 would show distortion from the unused card. You aren't by any chance using dummy plugs or or expanding the desktop to the 5870 or other silliness are you?

Eveofwar

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Quote from: chungenhung on January 07, 2012, 10:38:49 PM

Quote from: Eveofwar on January 07, 2012, 10:27:32 PM

When you say "funny pictures"...do they look similar to little purple or green blocks ? If so...sounds like GPU artifacts :/

New or used card ? If used, sounds like it's been overworked.

http://www.lmgtfy.com/?q=gpu+artifacts

Comon, don't use that lmgtfy on me.
Yes, they are artifacts, but they only occur when the 5870's memory are lowered.
The monitor is connected to a 5830.
5830 and 5870 are working fine together if 5870's memory is at default, no artifacts.
It starts to artifact is if I lower the 5870 memory by flashing BIOS.
Artifacts don't appear if I use Sapphire Trixx to lower it.
I've read somewhere that it has to do with Windows trying to set the memory speed when it enters the desktop. That is why using Trixx to lower it AFTER it has entered the desktop would not cause artifacts.

Posted lmgtfy to give you google references...not to insult Wink

Interesting that you would see artifacts on the 5830, if the 5870 is the "suspect"...I was under the impression that artifacts are supplied from the card that the monitor is attached to.

DeathAndTaxes

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Gerald Davis

Don't try flashing bios. Just use cgminer. I run 5970s (almost the same card GPU wise) at 190 Mhz w/o issue.

Really no reason to use that Trixx garbage or deal w/ custom bioses. Just use cgminer and be done with it.

chungenhung

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Quote from: Eveofwar on January 07, 2012, 10:27:32 PM

When you say "funny pictures"...do they look similar to little purple or green blocks ? If so...sounds like GPU artifacts :/

New or used card ? If used, sounds like it's been overworked.

http://www.lmgtfy.com/?q=gpu+artifacts

Comon, don't use that lmgtfy on me.
Yes, they are artifacts, but they only occur when the 5870's memory are lowered.
The monitor is connected to a 5830.
5830 and 5870 are working fine together if 5870's memory is at default, no artifacts.
It starts to artifact is if I lower the 5870 memory by flashing BIOS.
Artifacts don't appear if I use Sapphire Trixx to lower it.
I've read somewhere that it has to do with Windows trying to set the memory speed when it enters the desktop. That is why using Trixx to lower it AFTER it has entered the desktop would not cause artifacts.

Eveofwar

sr. member

Activity: 406

Merit: 250

When you say "funny pictures"...do they look similar to little purple or green blocks ? If so...sounds like GPU artifacts :/

New or used card ? If used, sounds like it's been overworked.

http://www.lmgtfy.com/?q=gpu+artifacts

chungenhung

legendary

Activity: 1134

Merit: 1005

Lowered the 5870 memory to 300MHz. Windows is showing funny pictures. However, it is hashing just fine.
What are your experiences when it comes to 5870 memory speeds? What speed is stable, which version driver? OS?

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