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Collatz on AMD 6870 GPU

T

Tobit

[H]ard|DCer of the Month - March 2010/May 2011
Joined
Dec 12, 2005
Messages
5,145
ASUS HD6870 - 915 MHz Core / 1050 MHz Memory - Running Collatz Conjecture

10/27/2010 4:29:11 PM | | ATI GPU 0: ATI unknown (CAL version 1.4.838, 1024MB, 2050 GFLOPS peak)

It's been awhile since I've run BOINC so I'm not quite sure how to calculate any type of PPD. However, it appears I am completing a Collatz task every 6m 40s. How does this compare to what others are seeing on older cards?

f09fyt.jpg
 
Stock 5770 does one in 12.3 minutes. That's quite an increase. Thanks for the time Tobit.
 
5870 finished in 5.6 mins. 4890 is nearly identical to the 5770. I may just get a few 6870/69xx's and call it a day.

EDIT: None of my cards are over clocked.
 
Yeah, I bought this 6870 because I needed a 1GB card to hold me over til Cayman. At this price, I think it's doing a fine job at that task so far (sans F@H).
 
Tobit said:
Yeah, I bought this 6870 because I needed a 1GB card to hold me over til Cayman. At this price, I think it's doing a fine job at that task so far (sans F@H).
Click to expand...

Would have been nice if the F@H had been a bit better. Looks to be pretty good on Collatz though, especially for the $$.
 
I now have the core clocked to 1000 MHz and the memory at 1125 MHz and now running 6m 4s times on Collatz units.
 
Tobit said:
I now have the core clocked to 1000 MHz and the memory at 1125 MHz and now running 6m 4s times on Collatz units.
Click to expand...

That's a great OC. I know in Collatz, you only need the core/shaders OCed, the memory only adds heat.

I would have though it would have made a much larger difference. Hmmmm.
Thanks Tobit.
 
It's only an 85 MHz overclock on the core, not that great. None of the utilities I have tried so far will let me push it past 1 GHz.
 
My HD 4830 takes 20 minutes a unit at stock clocks and 17 minutes a unit overclocked. I don't run collatz normally though because all they're doing is demonstrating that the conjecture works for larger and larger numbers. It is basically a given that it works by now and it needs to be proven mathematically. Even if after using a million dollars worth of electricity they find a case that does not fit the pattern I don't see it being worth it. The math is not really useful even if it is proven to work for the first 10^100 numbers.
 
Tobit said:
It's only an 85 MHz overclock on the core, not that great. None of the utilities I have tried so far will let me push it past 1 GHz.
Click to expand...

Lyxdexic got me again, thought it was 1125 core. :eek:
 
6850 @ 850/1000. Unfortunatly 850 is as high as CCC will let me take the core. I guess I need to install MSI Afterburner.

collatz.jpg
 
Vediovus said:
6850 @ 850/1000. Unfortunatly 850 is as high as CCC will let me take the core. I guess I need to install MSI Afterburner.

collatz.jpg
Click to expand...

Got me to wondering what a better driver will do for these cards.
 
Vediovus said:
6850 @ 850/1000. Unfortunatly 850 is as high as CCC will let me take the core. I guess I need to install MSI Afterburner.
Click to expand...


afterburner still doesnt support the 6k series yet.. should be soon though..


funny thing is the 6850's still faster then the GTX 480 on collatz :p way to much overhead on cuda.
 
sirmonkey1985 said:
afterburner still doesnt support the 6k series yet.. should be soon though..
Click to expand...
Yeah, we need some new tools to make these cards really shine.

I can use SmartDoctor to tweak the hell out of my voltage but the core has a max setting of 1000 MHz and SmartDoctor is limited to Asus boards. Sapphire Trixx will let you OC the clocks higher (1035 MHz confirmed by TweakTown) buit it is limited to Sapphire boards.

Afterburner currently detects the card and all sensors work but voltage is locked and also has a max core of 1000 MHz.
 
yeah i wouldnt be surprised if an update was out before this weekend. i remember it took them about a week or so to get an update out to support the voltage tweaking on the 5k series.
 
Got afterburner to let me take the core clock past 850. At 930, its doing a wu in about 7:15. I think I'll try to find the upper limit of the core on its default voltage tomorrow after work . As it stands now, I can go up to 1010 in afterburner, but I'm not expecting there to be a whole lot left without more voltage.
 
Thanks for sharing the numbers guys. Those are impressive. ATI has come along way since my 3870 (320 SPs) that does a Collatz WU in about 40 Minutes. :D
 
My 4870 (at 790MHz core and 1100MHz memory) is doing Collatz in 12:50 for another data point. AMD is looking mighty fine for my next upgrade with this in mind....
 
kirtar said:
Is there anything showing double precision performance?
Click to expand...


no the 6800 series like the 5770 and lower do not support double precision, the 6900's will.

but for ATI the double precision project to run is Milkyway@home where yet again ATI masacres nvidia by almost 2 minutes per WU. 5870 stock last i checked took 6 1/2 minutes a WU compared to an overclocked gtx 480 that did it just under 8 minutes, stock is high 8 minute range. an overclocked 5870 can get down into the low 5 minute high 4 minute range. so id expect the 6970 to easily do that stock and probably get down into the 3 minute range with the new shader core architecture.
 
Edit: nevermind, MW is double precision only I guess.

10/28/2010 1:20:31 PM | Milkyway@home | Message from Milkyway@home: An ATI GPU supporting double precision math is required
 
My 4890 can do a unit in about 11:30 at 900 Mhz core.

Right now I runa single 4890 and I have my resources split between collatz and MW@Home. I leave jsut a little on Collatz in case MW runs out of work. If I install a 68*0 alongside my 4890, do you think I can still run MW on the 4890 while the 68 tears up Collatz? I want to install an extra space heater to keep my furnace off. On the other hand if someone has a 5850 or 5870 they are wanting to unload, I might be interested.
 
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