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Topic: OC' 5850's for MAXIMUM PREFORMANCE - page 2. (Read 7091 times)

full member
Activity: 177
Merit: 100
June 05, 2011, 06:46:43 PM
#19
I've been browsing through the mining hardware comparison section, and noticed you can get up to 350-380 mhash/s with a 5850. With clock speed of 900-995

How is that possible? Catalyst control will only let me OC to 775mhz, at that rate I'm getting about 290mhash/s maxed out. What am I doing wrong?
the driver and sdk versions and the miner can also make a big difference. at 775Mhz I would get ~312MHash/s



I have the newest version of the driver off of AMD's website. As far as SDK I'm not sure what that is, care to elaborate?
legendary
Activity: 1708
Merit: 1019
June 05, 2011, 06:29:16 PM
#18
I've been browsing through the mining hardware comparison section, and noticed you can get up to 350-380 mhash/s with a 5850. With clock speed of 900-995

How is that possible? Catalyst control will only let me OC to 775mhz, at that rate I'm getting about 290mhash/s maxed out. What am I doing wrong?
the driver and sdk versions and the miner can also make a big difference. at 775Mhz I would get ~312MHash/s

member
Activity: 77
Merit: 10
June 05, 2011, 10:37:39 AM
#17
But, they also usually don't allow voltage adjustment.

With Trixx you can adjust the voltage....

How do you select a specific card on Trixx, if you have multiple cards installed on 1 MOBO?
you can't. that's one of its limitations
full member
Activity: 168
Merit: 100
June 05, 2011, 04:28:12 AM
#16
But, they also usually don't allow voltage adjustment.

With Trixx you can adjust the voltage....
legendary
Activity: 2408
Merit: 1009
Legen -wait for it- dary
June 05, 2011, 01:46:38 AM
#15
Non ref cards are usually better in that, they usually run cooler, they use less power, The companies revise the PCB to be smaller, they're usually quieter. But, they also usually don't allow voltage adjustment.
member
Activity: 112
Merit: 10
June 05, 2011, 01:19:20 AM
#14
XFX cards will only go to 775mhz unless you flash the bios...which you do not want to do if you do not have a reference card.
Asus ones are the best, with a limit of like 1000 i think. I have 2 of them at 900mhz, currently 340mh/s. (Can't overvolt on Linux) Sad

Why wouldn't you want to do that?  I thought reference means you can modify the voltage.  Whats wrong with pushing with the default voltage?

No, reference just means that it was the original card that AMD made. Non-reference means that the manufacturer made some changes to it. Usually non-reference cards are worse, they suck for overclocking, you can't really change core and memory limits unless you want to brick your card, and etc.

yes and no. there are a number of non ref cards that were made to be better than reference ones. i wouldnt be so one sided like OMG NON REF, AVOID LIKE THE PLAGUE,

using afterburner should unlock the limits
member
Activity: 73
Merit: 10
June 05, 2011, 01:18:39 AM
#13
XFX cards will only go to 775mhz unless you flash the bios...which you do not want to do if you do not have a reference card.
Asus ones are the best, with a limit of like 1000 i think. I have 2 of them at 900mhz, currently 340mh/s. (Can't overvolt on Linux) Sad

Why wouldn't you want to do that?  I thought reference means you can modify the voltage.  Whats wrong with pushing with the default voltage?

No, reference just means that it was the original card that AMD made. Non-reference means that the manufacturer made some changes to it. Usually non-reference cards are worse, they suck for overclocking, you can't really change core and memory limits unless you want to brick your card, and etc.

I understand that part.  What I don't get is why you would be against flashing the bios? Is there any specific reasons?  Are you saying modifying the vidcard would brick it?  That hasn't happened to me at least.  Are there some posts on the forum talking about this?
member
Activity: 79
Merit: 10
June 05, 2011, 01:17:48 AM
#12
This thread (http://forum.bitcoin.org/index.php?topic=4292.0) will help you overclock beyond the current limits of Afterburner. How much OC the card can withstand stably is another matter, however.

full member
Activity: 336
Merit: 100
June 05, 2011, 01:15:09 AM
#11
XFX cards will only go to 775mhz unless you flash the bios...which you do not want to do if you do not have a reference card.
Asus ones are the best, with a limit of like 1000 i think. I have 2 of them at 900mhz, currently 340mh/s. (Can't overvolt on Linux) Sad

Why wouldn't you want to do that?  I thought reference means you can modify the voltage.  Whats wrong with pushing with the default voltage?

No, reference just means that it was the original card that AMD made. Non-reference means that the manufacturer made some changes to it. Usually non-reference cards are worse, they suck for overclocking, you can't really change core and memory limits unless you want to brick your card, and etc.
sr. member
Activity: 280
Merit: 250
Firstbits: 12pqwk
June 05, 2011, 01:14:29 AM
#10
I have 2 XFXs and I'm at 850ish core, with afterburner,
anything past that gets way too hot.

Dunno how to adjust the voltage though, does it require a BIOS flash I assume?
full member
Activity: 336
Merit: 100
June 05, 2011, 01:13:34 AM
#9
I have XFX - this must be a really bad brand..

Lol don't bm a brand just because you think it's bad.
XFX cards are the best. Best 6990 you can get, amazing customer service.
member
Activity: 73
Merit: 10
June 05, 2011, 01:12:47 AM
#8
XFX cards will only go to 775mhz unless you flash the bios...which you do not want to do if you do not have a reference card.
Asus ones are the best, with a limit of like 1000 i think. I have 2 of them at 900mhz, currently 340mh/s. (Can't overvolt on Linux) Sad

Why wouldn't you want to do that?  I thought reference means you can modify the voltage.  Whats wrong with pushing with the default voltage?
member
Activity: 73
Merit: 10
June 05, 2011, 01:11:24 AM
#7
use something like http://www.sapphiretech.com/ssc/TriXX/

Also if you switch to linux you will get some extra mhash.

I know about sapphire trixx, however I have more than 1 video card and it can't seem to choose between videocards to adjust..

Ah ok,  well what I would do is to figure out the max using trixx then I will modify the video bios according to those figures.  Why don't you do that?  Then you can modify both video cards and then they will work fine.
full member
Activity: 336
Merit: 100
June 05, 2011, 01:11:08 AM
#6
XFX cards will only go to 775mhz unless you flash the bios...which you do not want to do if you do not have a reference card.
Asus ones are the best, with a limit of like 1000 i think. I have 2 of them at 900mhz, currently 340mh/s. (Can't overvolt on Linux) Sad
member
Activity: 73
Merit: 10
June 05, 2011, 01:09:12 AM
#5
my sapphires I can push to 372,  my xfx I can push to 355 mhz

like I said, use the trixx and custom modify your video card bios if you want to switch to linux.

Should make dedicated mining machine.  On windows you lose some performance (at least for me Wink)
full member
Activity: 177
Merit: 100
June 05, 2011, 01:07:15 AM
#4
I have XFX - this must be a really bad brand..
copper member
Activity: 56
Merit: 0
June 05, 2011, 01:03:11 AM
#3
What brand do you have?

If you have a Sapphire, you should get the estimated numbers you're seeing other members report.

If you have a Diamond (or some other non-reference board) you will NOT be getting the numbers you see other members report and you will NOT be able to change voltages or reach higher clocks.
member
Activity: 73
Merit: 10
June 05, 2011, 12:54:26 AM
#2
use something like http://www.sapphiretech.com/ssc/TriXX/

Also if you switch to linux you will get some extra mhash.
full member
Activity: 177
Merit: 100
June 05, 2011, 12:49:48 AM
#1
I've been browsing through the mining hardware comparison section, and noticed you can get up to 350-380 mhash/s with a 5850. With clock speed of 900-995

How is that possible? Catalyst control will only let me OC to 775mhz, at that rate I'm getting about 290mhash/s maxed out. What am I doing wrong?
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