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Topic: HD5850 low MHash/s - page 2. (Read 6541 times)

full member
Activity: 126
Merit: 100
April 08, 2011, 12:19:37 PM
#6
Windows 7 64bit
Catalsyt was 10.8 when i wrote the first post, just updated it to 11.3.
Still no result, when i turn on the miner GPU clock was 400 and Memory clock was 1000. and it wouldn't go up to the default values of 725/1000.
So i tried turning off firefox and firing up the miner, values went to 725/1000 and i got 240 MHash/s.
Seems firefox with flash f**ks this up. :/ if anyone knows how to fix it...

as for lowering the mem clock i get better temps and lose very little MHash/s correct?

You shouldn't even be losing Mh/s. I for example GAINED quite a few Mh/s! and power consumption and heat go way down.

In firefox, go in options and untick the "enable hardware acceleration when available"
member
Activity: 90
Merit: 10
April 08, 2011, 12:15:23 PM
#5
Windows 7 64bit
Catalsyt was 10.8 when i wrote the first post, just updated it to 11.3.
Still no result, when i turn on the miner GPU clock was 400 and Memory clock was 1000. and it wouldn't go up to the default values of 725/1000.
So i tried turning off firefox and firing up the miner, values went to 725/1000 and i got 240 MHash/s.
Seems firefox with flash f**ks this up. :/ if anyone knows how to fix it...

as for lowering the mem clock i get better temps and lose very little MHash/s correct?
full member
Activity: 126
Merit: 100
April 08, 2011, 12:07:32 PM
#4
I get 318 Mh/s fully overclocked to 900/1300 Core/Mem on Ubuntu Linux with SDK 2.1.

I was also getting right around 250Mh/s stock.

I suggest downclocking your mem to idle value https://bitcointalksearch.org/topic/lowering-mem-clock-to-idle-speeds-speeds-up-mhs-4292
sr. member
Activity: 392
Merit: 250
April 08, 2011, 11:59:00 AM
#3
I get 318 Mh/s fully overclocked to 900/1300 Core/Mem on Ubuntu Linux with SDK 2.1.

I was also getting right around 250Mh/s stock.
full member
Activity: 126
Merit: 100
April 08, 2011, 11:49:16 AM
#2
Hi,

Using poclbm and SDK 2.2, i'm getting 137 MHash/s, from the table above i should be getting 250 MHash/s +-.
https://en.bitcoin.it/wiki/Mining_hardware_comparison

What might i be doing wrong?


generally, you might want to use SDK 2.1 instead of 2.2.  i use 5850s also, and there's a marked difference between the two SDKs: i'm getting a rock-solid 249 Mh/s/card with no overclocking.  also, try messing around with the -f and -w settings.

note that i'm using DiabloMiner on Linux (Debian testing)...

so, more specifically - what's your OS, your ATI Catalyst version, and your start-up parameters?  someone with an identical system to yours will have better info...
member
Activity: 90
Merit: 10
April 08, 2011, 11:33:15 AM
#1
Hi,

Using poclbm and SDK 2.2, i'm getting 137 MHash/s, from the table above i should be getting 250 MHash/s +-.
https://en.bitcoin.it/wiki/Mining_hardware_comparison

What might i be doing wrong?
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