How to maximize a 5830?

[jjiimm_64]

I am having issues staying above 950mhz. It lasts for 12 hours and then it drops. Does not seem stable for prolong periods of time. Is it possible this is because of my PSU?
I am using a Rosewill 700W (only 72% efficiency though)
I am using a AMD Sempron CPU so nothing else in the rig consumes power.


My temps stay below 62'c on either card so it is not temps.

It depends on who made your card the people saying they get above 1000 mhz I believe all have saphire cards. In my experience the saphire cards can be pushed up to around 1040 on stock voltage

I just installed 2 brand new 5830's saphires from newegg into my 6th miner.  I use win64 guiminer with prclm
I use msiafterburner and have experience with over clocking 6950, 5870, 5830, and 6850's

anyway,  brand new msi board, 1000w power supply just tried to do a 900 clock on the new 5830's and immediately crashed...  I wonder if the new cards cant be over clocked like the older ones?

update:  I added 2 5870's to the same mother board and overclocked them to my standard 960/450. they are running at about 400Mh.   now added the 5830's to the same board and decided to over clock the 70's, but leave the 30's at stock clock (lower mem) to 'burn them in' for a while and will adjust them later.

This overclocking is tricky business.... as I have read the forums it seams that every setup is different. I seam to not be able to stably overclock cards as others claim to be able to do... 

[1714166658]

1714166658

[The_JMiner]

No idea Jim ,
Today I had it had 975 and it lasted about 18 hours at that speed and crashed.  Since I am not home during the crash I still do not know if it is the boards or maybe loss of power (we have had storms here lately) or what.  Good luck.

[mike678]

I am having issues staying above 950mhz. It lasts for 12 hours and then it drops. Does not seem stable for prolong periods of time. Is it possible this is because of my PSU?
I am using a Rosewill 700W (only 72% efficiency though)
I am using a AMD Sempron CPU so nothing else in the rig consumes power.


My temps stay below 62'c on either card so it is not temps.

It depends on who made your card the people saying they get above 1000 mhz I believe all have saphire cards. In my experience the saphire cards can be pushed up to around 1040 on stock voltage

I just installed 2 brand new 5830's saphires from newegg into my 6th miner.  I use win64 guiminer with prclm
I use msiafterburner and have experience with over clocking 6950, 5870, 5830, and 6850's

anyway,  brand new msi board, 1000w power supply just tried to do a 900 clock on the new 5830's and immediately crashed...  I wonder if the new cards cant be over clocked like the older ones?

I'm not sure about the $130 version but I picked up the 110 around the end of June and my cards are completely stable at 1030 mhz.

[Starlightbreaker]

Every card is different though.
I have 2x 5830, one is stable at 1030, hit the limit at 1045, the other one will always crash if it goes to 1020, both bought from newegg at the same time.

pretty much based on your luck...and your card.

[teukon]

Every card is different though.
I have 2x 5830, one is stable at 1030, hit the limit at 1045, the other one will always crash if it goes to 1020, both bought from newegg at the same time.

pretty much based on your luck...and your card.

Agreed.  My two 5850s are identical on the back (all codes are the same) with the sole exception of a black circular stamp for which the first reads "TEST PASS 61" and the second "TEST PASS 63".  I'd guess they were near to each other from their creation.  At stock voltage one card hits max stable clocks at around 970 MHz and will often crash instantly at 990 MHz, the other goes to 1020, crashing at 1040.  After a 0.1V undervolt I did all the testing again and found max stable clocks of 845 MHz and 895 MHz.

I tried swapping them round on the board thinking it was a heat issues, and later tweaking the fan speeds to keep the cards at the same temperature, but still the 'lucky' card was quite a bit faster.

My lucky card lived up to its name last night when I decided to start mining namecoin.  It found a block within 90 minutes of me starting .

[mike678]

Every card is different though.
I have 2x 5830, one is stable at 1030, hit the limit at 1045, the other one will always crash if it goes to 1020, both bought from newegg at the same time.

pretty much based on your luck...and your card.

Thats true they do vary by a little but what you just said is a 2.5% difference. He said it crashes at 900  mhz and its a saphire. Going off your 1020 mhz example thats a 13% difference and both of his cards are doing this. It just seems a little weird to me thats all.

[teukon]

Every card is different though.
I have 2x 5830, one is stable at 1030, hit the limit at 1045, the other one will always crash if it goes to 1020, both bought from newegg at the same time.

pretty much based on your luck...and your card.

Thats true they do vary by a little but what you just said is a 2.5% difference. He said it crashes at 900  mhz and its a saphire. Going off your 1020 mhz example thats a 13% difference and both of his cards are doing this. It just seems a little weird to me thats all.

There are many factors which have a significant impact on a cards stability and even a simple thing such as disabling Flash hardware acceleration can allow one to reach a higher stable clock rate.  There would likely be a long list of differences between the card which crashes at 900 MHz and the one which runs fine at 1030 MHz.

What I find interesting is how two seemingly identical cards, run in the same slot of the same mining rig, kept at the same temperature, configured and maintained in the same way, can have such different maximum stable clock rates.

[The_JMiner]

How much power does a 5830 need?  I did some research and saw that each one takes about 380W at full load? Is that true?

[deslok]

The Maximum board power as per ATI(AMD) specifications is 175watt. you could excede this overclocking but to that degree they must be refrencing complete system power not the card alone.

refrence

http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-5000/hd-5830/Pages/hd-5830-overview.aspx#2

[alkhdaniel]

How much power does a 5830 need?  I did some research and saw that each one takes about 380W at full load? Is that true?

Most likely no. using 2*5850 with 550w corsair PSU, both ~10% OC'd (mem clock at 300 though), 2*1tb hdd, i3 530.

Barely any fans (1 chassi fan, 2 fans for gpu, 1 for cpu, all stock), no cd/dvd drive.

However i don't recommend 550w for 2*5850, i'm actually a little bit scared something might fuck up.

tl;dr: they most likely run at max 150w at full load, let's say 200w to really be safe:
Calculation to determine how many watts you should get to be really really be safe: 1.10*(175*x cards)+150=whatever
(*1.10 because PSU is not 100% efficient)
Having about 50w less than what this calculates shouldn't be a problem though.

[The_JMiner]

The Maximum board power as per ATI(AMD) specifications is 175watt. you could excede this overclocking but to that degree they must be refrencing complete system power not the card alone.

refrence

http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-5000/hd-5830/Pages/hd-5830-overview.aspx#2

Did not see that thanks!