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Author Topic: Hardware Question: 5850 has lower M/hash now, what gives??  (Read 787 times)
Winst0n
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June 25, 2011, 06:55:43 AM
 #1


Hello all and thanks for reading;

ASUS 5850 DirectCU cards
ASUS mobo
Windows 7


I have a 4x 5850 system that runs quite cool.  I had three cards running at 333M/hash each while waiting for the fourth to arrive in the mail (with some PCIe extenders as they were running hot).

I managed to get everything working, running cool and back together, but can now only overclock to 865Mhz.
Before I had it rock solid at 900Mhz, with no problems. When I go over 865Mhz now the screen blinks black one card stops hashing and then I get a message that the driver, 'has recovered'. Embarrassed

If I go to 900Mhz it freezes.  But runs without issues at 865Mhz.

The only thing I can think of is that my neighbor Shocked accidently Shocked put his (sweaty?) thumb on the gold contacts of the 5850 GPU during the reconfig of the hardware while handling the card. 

Has anyone seen anything like that before, what effects the amount you can overclock??

Is there a solution?  Huh  Clean it with a micro-fiber cloth and rubbing alcohol?

Your ideas, contributions of experience greatly appreciated.

Thank you all,

(PS.  don't let neighbors help, they mean well but don't have skin in the game if things go bad.  Roll Eyes )

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goxed
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June 25, 2011, 06:58:04 AM
 #2

Can you share what PSU you are using? A link would be ideal.

Looking to review Bitcoin / Crypto mining Hardware.
Wuked
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June 25, 2011, 09:37:42 AM
 #3

Are you monitoring temperatures?

What are they getting to ?

bmgjet
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June 25, 2011, 09:53:09 AM
 #4

Try that card on its own, not all are of the same quality and thats why its best to buy all of them the same brand and batch at the same time.

Donations to: 1BMGjetfht9XLkGBYR4TSsuXjrYEKACcow
1stbits: 1bmgjet
300MHash/s 6850 http://www.techpowerup.com/gpuz/5u6wr/
Overclocked for 6 years and still strong http://valid.canardpc.com/show_oc.php?id=1931458 & http://valid.canardpc.com/show_oc.php?id=285337
Winst0n
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June 25, 2011, 05:44:06 PM
 #5


Thank-you for these answers, and I welcome others,

I am using a 1000w Thermalteke & and a Top Power 650w 
- http://www.thermaltakeusa.com/Product.aspx?S=1172&ID=1909
- http://www.cty.ca/productdetails.asp?pid=4355
( I got the 1000 watt first thinking it would do all four, then had to add the 650W for extra connectors
[ did the paperclip trick which works great ] )
don't think it has anything to do with power, as the card that 'throwing a shoe' driver-wise is on the 1000w supply which has more than enough power.  Right?  (Yes I have reloaded drivers, latest version that works)

All cards are the ASUS 5850 DirectCU 1Gb (not TOP) brand new, they should make it to 900 right?? 
Most guys get 5850 to 900?

The temps are great.  I have been tinkering with every trick in the forums, and got it down.  I have 3 cards running at 52-58ºC an one a bit higher at 64ºC ( the card that is warmer is the one that is in the bottom that has the extender closest to is fan)  but its still better than most guys that get four all together on a board.  So I am happy with the temps and air flow.  The only thing I am planning for summer is a 'hood' to evacuate hot air out my kitchen vent so my apartment isn't 85ºF when I get home.  The rig is low to the ground and has good air flow to the bottom.

Also, I haven't really tinkered with this the rig as 1200M/h is 'alright,' 
(but 1333M/h is better considering what I paid  Cry)

but I thought I read somewhere that inserting/removing cards wears out the connectors and is not too good for them? 
Can anyone second or dispel that urban myth?

I will try the card on its own, but would like to leave this post for a while, as I don't have time in the next little while.

Here's is a couple pic of my 'Frankin-puter'  (I gave it LIFE! -  Grin - I gave my creation LIFE!!)
PS. that aluminum bracket is patent-pending  Wink, but you can copy it if you donate to:
19z8tQUZCv8aYHtPt4AQvQkkXK3paUx8WU
(although were I to make it again I'd put a hole in center to let heat escape (its not that bad, I like perfection),
but don't want to fuss with it and take it offline for that many hours)
http://photoshare.shaw.ca/image/c/f/f/97803/img_0216-0.jpg?rev=0
http://photoshare.shaw.ca/image/c/f/f/97803/img_0217-0.jpg?rev=0
http://photoshare.shaw.ca/image/c/f/f/97803/img_0218-0.jpg?rev=0

mautobu
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June 25, 2011, 08:43:52 PM
 #6

WOW Shocked

That is PIMP!

Just file the edges and power coat that bracket bracket white, add some speed lines. you're bound to get at least 20 MHash/sec in style points.
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