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Author Topic: Power Drain amout issues [Closed~]  (Read 1893 times)
Fiyasko
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June 09, 2011, 08:15:56 PM
 #21

It's probably not power that is causing the issue, likely its either a buggy card, or the motherboard needs a firmware upgrade.

Test over-clocking with each card individually, see if the freezes occur only with one card, or if they work separately just fine.

To make sure power is not the issue:
You can get a simple multimeter for 10-15 bucks from nearly any hardware store/walmart to test the 12v Rails when at full load, see if they drop amperage significantly, that could also be an issue. Setting the cards on different Rails is also a good idea.

Also check with the manufacturer of the motherboard for a bios update, sometimes that fixes issues. Also in the bios you can sometimes set "constant voltage" or "load spectrum" or similar, that should make over-clocking the GFX more stable.

Adjusting the PCI frequency/HT freq, can help on some AMD mobos.

You win!

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Goldenmaw
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June 09, 2011, 08:18:49 PM
 #22

Out of curiosity, what did your issue turn out to be?

Oh, and Legit strikes again!
gat3way
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June 09, 2011, 08:21:22 PM
 #23

You are kinda wrong on this. While typically the 2xsha256 kernel could require as few as 4 bytes of __global (video) memory to store kernel results, you are likely utilizing much more than that. The kernel code is initially placed in the video memory and most modern AMD GPUs have just 48KB worth of instruction cache (this might be different on Cayman as far as size is concerned, haven't checked). Any bitcoin kernel binary takes more than 100KB and naturally does not fit there and this leads to performance degradation the bigger kernel size is. This is also beyond what profilers like sprofile can show you.






LegitBit
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June 09, 2011, 08:33:48 PM
 #24

Thanks for the validation, it will be my first donation once it arrives.  Smiley

Out of curiosity, what did your issue turn out to be?
+1

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LegitBit
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June 09, 2011, 08:58:03 PM
 #25

To all: I received payment, all is good.

Just FYI.

Donate : 1EiAKUmTVtqXsaGLKQQVvLT9DDnHsT7jTZ (Block Explorer)
Fiyasko
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June 09, 2011, 09:11:47 PM
 #26

One card couldnt oc as much as the other

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Goldenmaw
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June 09, 2011, 09:22:58 PM
 #27

That's funny.  I definitely suggested that first.  I'll consider the payment to Legit compensation for advice he gave me in another thread. Wink
LegitBit
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June 09, 2011, 10:31:55 PM
 #28

That's funny.  I definitely suggested that first.  I'll consider the payment to Legit compensation for advice he gave me in another thread. Wink

Yep, sorry I didn't notice but you definitely did suggest that particular issue first. (Though not as eloquently, if I may be allowed stroke my own ego  Cool )

What is your donation address so I can send the 0.2 BTC he sent me your way?

http://blockexplorer.com/address/1MwsYzs11tUPbu2iqywSjvu5854H1FYABn

Donate : 1EiAKUmTVtqXsaGLKQQVvLT9DDnHsT7jTZ (Block Explorer)
Goldenmaw
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June 09, 2011, 10:54:36 PM
 #29

I insist you keep the BTC, Legit.  As I said, you've been quite helpful to me.
kiwiasian
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June 10, 2011, 12:11:49 AM
 #30

One card couldnt oc as much as the other

...That's what we've been telling you

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