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Author Topic: Overclocking xfx hd 5850  (Read 2500 times)
BitMofo
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August 14, 2011, 01:15:29 PM
 #1

Hi guys,

on standard manufacture I was getting around 290mhash/s.

I have the Catalyst Control Centre however my overclocking options seem rather limited:



The setup you see there is giving me around 300mhash/s.
Fan speed is still pretty low - as I am using my main PC as mining PC, don't really want fans running at 100%! They're pretty noisy!

I've seen threads with people pumping out 400mhash/s +...
I am curious as to how people are achieving this?
When I max out all settings (fan speed to 100% to be safe then 775Mhz, the max I achieve is 310mhash/s.

Any suggestions?

Do I need to use a third party software? Any recommendations?

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pekv2
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August 14, 2011, 01:24:46 PM
 #2

1) Install and use MSI Afterburner or Trixx.

2) Overclock & use flags for which ever miner/kernel you are using.

3) You will have to put up with the noise level or pick up a new better heatsink with low DBA fans, example:arctic cooling accelero HS.
BitMofo
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August 14, 2011, 01:29:17 PM
 #3

1) Install and use MSI Afterburner or Trixx.

2) Overclock & use flags for which ever miner/kernel you are using.

3) You will have to put up with the noise level or pick up a new better heatsink with low DBA fans, example:arctic cooling accelero HS.


Cheers,

Is it worth setting fan speed to 100% when overclocking then? What do you reckon is the max temperature I should not exceed? 85degrees celcius? I'll aim to keep it under 80 I think?

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pekv2
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August 14, 2011, 01:35:59 PM
 #4

Cheers,

Is it worth setting fan speed to 100% when overclocking then? What do you reckon is the max temperature I should not exceed? 85degrees celcius? I'll aim to keep it under 80 I think?

It is up to you if you think it is worth it, to me, I believe so.

85c is fine, I would not exceed @ 24/7 over 90c.

They can handle upto 100c -110c but I would not recommend that @ 24/7.

You could also try to use a tech station or remove all your components from the PC case, leave it in the open.

Changing the TIM that is if the stock TIM is still applied, could help significantly in keeping temps lower.
BitMofo
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August 14, 2011, 01:47:22 PM
 #5

I'm still not able to alter the core voltage:



I went into settings and checked "unlock voltage control" and "unlock voltage monitoring" and restarted but it is still locked down...

Any idea why?

Thanks

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pekv2
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August 14, 2011, 01:53:57 PM
 #6

Which brand/model 5850 do you own?

Most likely it does not have voltage control. Just like my XFX 5830 does not have voltage control.
BitMofo
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August 14, 2011, 02:18:55 PM
 #7

Which brand/model 5850 do you own?

Most likely it does not have voltage control. Just like my XFX 5830 does not have voltage control.

Yeah this is an xfx too

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mike678
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August 14, 2011, 03:29:32 PM
 #8

If you are going to use afterburner make sure you did this. https://bitcointalk.org/index.php?topic=18102.0

I'd also like to note that I had stability issues with my sapphire 5850's when I changed speeds in afterburner. If you seem to have the same problem try using trixx because I have had no problems with that.
ahitman
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August 21, 2011, 01:49:53 PM
 #9

You can put the memory speed down to 300, it wont affect your rates but it will give you a cooler gpu, and with a cooler gpu you can run the fan slower. Just dont go too slow (I wount go lower than 50 to 60%) because the other components on the card need airflow to stay cool as well.
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August 21, 2011, 03:20:59 PM
 #10

I bought a couple of 5850s from a UK videocard webshop recommended on this forum - cheap for new cards - but no obvious brand, I guess the cards were 'whatever they could source'. When they arrived, the cards turned out to be XFX 'Black Edition' 5850s.

Given the hyperbolic horseshit on the packaging, I was expecting the cards to be good overclockers, at least up to the level of my 'old' 5-heatpipe Sapphire and the two Sapphire 'Extreme's that I use. However, the XFX base clock was 735 MHz and they were a bastard to clock up to respectable rates.

My 'old' Sapphire card does 406 MH/sec with a 990 MHz core clock. The 'extreme' cards can only push between 370 and 390.

The XFX 'Black Edition' examples I have (only two, so not statistically significant) only clocked to 360 MH/s and that took ages to reach, with a finely tuned memory clock. The highest core clock my cards could manage was 930 MHz - the other one couldn't better 900 MHz. Perhaps the Sapphire cards run at higher voltages and can clock higher? I don't know - but all the bullshit about the 'Black Edition' being some top-bin part, capable of heavy overclocks, seems to truly be bullshit.

That said, I don't over-volt cards. Perhaps the 'Black Edition' *is* a strong top-bin chip and can take big voltage increases, and with the voltage increase the chip can be clocked a lot higher. It's not just a principle thing about not wanting to strain the VRMs and reduce the lifespan of the board - I'm running Linux on all my miners, and voltage tweaks under Linux aren't easy (either that, or I don't have or know about the tool).


Has anyone here with XFX 'Black Edition' cards found them to be 'super' GPUs? Or is the marketing the steaming pile of dung it appears on first impressions? Still, overall, the old retail Sapphire 5850 from PC World - not 'extreme', not 'limited edition', no bullshit - is my fastest card bar none. I've been getting over 405 MH/s for a month now 24/7 on the standard voltage... just 990 MHz core clock, 300 MHz memory (was using 275 MHz memory, but this gave 403 MH/s)...

From my non-significant sample, I'd go with Sapphire cards every time. Smiley

...so I give in to the rhythm, the click click clack
I'm too wasted to fight back...


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pekv2
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August 21, 2011, 04:48:18 PM
 #11

Ionno, A couple of pros for my xfx 5830, I've got it clocked to 1010Mhz when I am at the pc and 1030 afk. 1010 creates 314Mhash/s, 1030 creates 322-324 Mhash/s, lifetime warranty. Cons, no voltage control, the fan went out three times on it, xfx sent me a "new" fan everytime. The fan would vibrate and sequel like a pig, I gave up, took the fan and shield off, garbage tied a 38mm x 120mm panaflo on the HS.

Some xfx 5850's are probably good, the factory overclocked ones, like my 5830 is factory overclocked + my overclocking = good Mhash/s.

Is your xfx 5850 factory overclocked?
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