Primecoin GPU miner: 9.1 CPD on a 280x / pool / 2% dev.fee - page 52.

madMAx510510

member

Activity: 70

Merit: 10

Quote from: ozzy1926 on April 03, 2014, 12:02:34 AM

Quote from: primeGPU on April 02, 2014, 11:42:32 PM

Quote from: ozzy1926 on April 02, 2014, 11:39:33 PM

when the miner out will it support 290 cards ?

Yes, but 290 has 10% less performance than 280x currently.

how ?Because of clockspeed?

Probably because it has 40% less 32bit mul capability. This is due to the Hawaii chip clocking the DP units at half the speed compared to Tahiti.

Note: The DP (64bit double precision) units are also used for 32bit mul in case ur wondering.

ivanlabrie

hero member

Activity: 812

Merit: 1000

Found two 10 ch and 1 block after reducing temps by 13c and decreasing core clock by 25mhz.
Running time was barely 8 hours this time, after mining with different settings and higher temps for 12hs without a single 10 ch.

2 msi gaming r9 280x cards at 1075mhz core, 1050mv, 1500mhz ram, i7 3820 at 4.3ghz and samsumg ram at 1600mhz cl11-11-11-28-1t.
Win 7 Pro 64
8gb of ram

Supercomputing

sr. member

Activity: 278

Merit: 250

Quote from: Primorial on April 03, 2014, 01:19:22 AM

Quote from: Supercomputing on April 02, 2014, 02:36:44 PM

It seems to me that member mtrlt was on the right track but needed some help with an efficient multiple-precision arithmetic implementation.
https://bitcointalksearch.org/topic/xpm-working-on-a-gpu-miner-for-primecoin-258540

Although I have almost no experience with OpenCL, it will not take too much time to supercharge mtrlt's code with an efficient implementation of some functions. I will have some playtime in May to mess around with the code.

You are right, his code makes perfect sense but contains several bugs, some of them are obvious, some are hard to even detect. Making a functional prototype out of it seems to be moderately hard (don't ask me how do I know), getting competitive performance even on GCN is much harder, as usual, though. Modern AMD's OpenCL compiler is unstable, unpredictable and buggy, it is no fun to play with.

Do you have any suggestions for the best OpenCL compiler version to use? ISA Assembler?

Thanks in advance

Primorial

newbie

Activity: 7

Merit: 0

Quote from: Supercomputing on April 02, 2014, 02:36:44 PM

It seems to me that member mtrlt was on the right track but needed some help with an efficient multiple-precision arithmetic implementation.
https://bitcointalksearch.org/topic/xpm-working-on-a-gpu-miner-for-primecoin-258540

Although I have almost no experience with OpenCL, it will not take too much time to supercharge mtrlt's code with an efficient implementation of some functions. I will have some playtime in May to mess around with the code.

You are right, his code makes perfect sense but contains several bugs, some of them are obvious, some are hard to even detect. Making a functional prototype out of it seems to be moderately hard (don't ask me how do I know), getting competitive performance even on GCN is much harder, as usual, though. Modern AMD's OpenCL compiler is unstable, unpredictable and buggy, it is no fun to play with.

ozzy1926

sr. member

Activity: 378

Merit: 250

Quote from: primeGPU on April 02, 2014, 11:42:32 PM

Quote from: ozzy1926 on April 02, 2014, 11:39:33 PM

when the miner out will it support 290 cards ?

Yes, but 290 has 10% less performance than 280x currently.

how ?Because of clockspeed?

primeGPU

full member

Activity: 196

Merit: 100

Quote from: ozzy1926 on April 02, 2014, 11:39:33 PM

when the miner out will it support 290 cards ?

Yes, but 290 has 10% less performance than 280x currently.

The Doktor

jr. member

Activity: 82

Merit: 1

DOGEvangelist

Quote from: ivanlabrie on April 02, 2014, 10:49:17 PM

Who exactly are you doctor? Cool

A shibe with a badly chosen nick. Should be "The Vet" Grin

primeGPU

full member

Activity: 196

Merit: 100

Quote from: fudge on April 02, 2014, 11:38:05 PM

Do you accept new testers? Got some 7970

Nope, sorry.

ozzy1926

sr. member

Activity: 378

Merit: 250

when the miner out will it support 290 cards ?

fudge

hero member

Activity: 666

Merit: 500

Do you accept new testers? Got some 7970

trogdorjw73

hero member

Activity: 482

Merit: 500

Quote from: primeGPU on April 02, 2014, 06:34:00 PM

Quote from: trogdorjw73 on April 02, 2014, 05:34:41 PM

Even if the software could deliver on the promised performance (which would mean around 19 XPM per day on a 280X)

Huh? Where did you get those numbers from?

My bad -- I had put 3.6 chains per day in my calculation (for 3x280X). Which means it will take that much longer to recover the cost of 65 XPM per GPU license.

trogdorjw73

hero member

Activity: 482

Merit: 500

ivanlabrie

hero member

Activity: 812

Merit: 1000

on par with my readings...145w per 280x mining xpm.

Starlightbreaker

legendary

Activity: 1764

Merit: 1006

3 years of mining, never had much issue with high temp anyways.

4 cards in a closed box, gotta vent them heat outside.

~800w with 4 cards and athlon X4, overclocked.

merc84

hero member

Activity: 799

Merit: 1000

Quote from: Starlightbreaker on April 02, 2014, 10:10:38 PM

this is the first miner that's pretty sensitive to temperature.

i don't exactly cool my gpus, and if it goes over 80c, the time will go up, and will affect the whole rig, not only one card.

Well depending on how ur rig is setup (ie cards in case or open air with riser additional fans etc) dumping 80oC onto ur motherboard is a general recipe for disaster and just general bad practice Wink

On a side note anyone of the tester have a killawatt meter and care to give us a reading from the wall what the whole rig is pulling during mining

dont forget to post detail on the rig

when quoting power draw.

Starlightbreaker

legendary

Activity: 1764

Merit: 1006

Quote from: ivanlabrie on April 02, 2014, 10:49:17 PM

Who exactly are you doctor? Cool

-

I improved airflow and am now mining at 13c less than before (with lower fan speeds too).

We'll see if it affects stability or block finding.

on my mix rig, it's crap.

maybe if it's all the same, it'll work better.

primeGPU

full member

Activity: 196

Merit: 100

We definitely need to to put this heat issue into FAQ.

ivanlabrie

hero member

Activity: 812

Merit: 1000

Who exactly are you doctor? Cool

-

I improved airflow and am now mining at 13c less than before (with lower fan speeds too).

We'll see if it affects stability or block finding.

Starlightbreaker

legendary

Activity: 1764

Merit: 1006

Quote from: The Doktor on April 02, 2014, 10:18:29 PM

If you're still accepting testers, I would love to try it on a few 7950s. I do believe you said it may work on older cards.

it'll work on a 7950, but the performance is shit.

The Doktor

jr. member

Activity: 82

Merit: 1

DOGEvangelist

If you're still accepting testers, I would love to try it on a few 7950s. I do believe you said it may work on older cards.

Topic: Primecoin GPU miner: 9.1 CPD on a 280x / pool / 2% dev.fee - page 52. (Read 100980 times)