I ran a bunch of shorties over the weekend and they ran fairly close to the 560s our there... assuming they were running 3 at a time as well. I may try 4 later today just to see if the 6970 can handle it

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In a rich man's house there is no place to spit but his face.
Diogenes Of Sinope

I run 2 at a time on my 5 GTX460's (1gb). I tried 3 at a time, but it gave me no measurable gain, and made my triple 460 machine completely unusable and would often lock up or reboot. Now with 4x GTX460's in that machine, I seriously doubt it could handle it for long. I still only run 2 at a time on my GTX570, but will probably bump to 3 tonight since that machine has more or less peaked in RAC.

As a rough guide, my GTX 460 (2gb) completes on average 4.73 MB tasks per hour running 3 tasks, and 5.45 tasks per hour running 2 tasks.
Your milage may vary.

Regards,

A

Sounds about right. Mine do 2 at a time in roughly 20 minutes (overclocked to 900mhz), so that's about 6/hr. With a single WU, they take about 12-14 minutes IIRC, so thats 4.3-5/hr. I honestly don't remember what mine did with 3 at a time, as it was never reliable enough to keep it there.

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I am working on a little page from the data that you guys have provided so far. It is just getting done in my "other" "other" free time.

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SETI@home classic workunits: 93,865 CPU time: 863,447 hours
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Tried it with 2 WU's but my GTX460FTW1GB/266.58 needs more than twice the time compared to a single WU.

Tried it with 2 WU's but my GTX460FTW1GB/266.58 needs more than twice the time compared to a single WU.

Your times seem VERY long compared to my GTX460's. I see you already are running the X38 app, same as me. My GTX460 is clocked a little faster than yours (875mhz vs 850mhz), but your setup is taking almost twice as long to complete a similar AR WU. Even shorties are taking ~8 minutes for you. My rig is doing two at a time, around 3-4 minutes for shorties, and ~20 for normal WU's. A few of the normal WU's I found for yours were around 35 minutes.

What are the specs on the rest of your system? Also, I'm seeing a lot of errors from that machine, are your cards downclocking by chance? Use GPU-Z to see the current status of your cards, including load, temperature, clock rate, etc.

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I conducted a test on my machine with 2 OC'ed GTX 560 Ti cards (900 MHz Core / 1070 MHz Memory, 1 GB VRAM, Lunatics x38g).

The result is that there is a significant advantage of running 2 or 3 WUs at once over running only one at a time. However, the test does not clearly show any advantage or disadvantage of running more than two WUs at a time. The two GPUs have different memory usages because the first one displays to two 1080p screens. At least that's what I think.

1 WU at a time:
Memory 473 MB / 248 MB
GPU Load 65-80%

8 WUs completed. When the timer stopped, the active WUs were at 56.9 / 57.7 percent.
Thus the score is 9.15 WUs / 10 minutes.

2 WUs at once:
Memory 741 MB / 496 MB
GPU Load 95-99%

12 WUs completed. When the timer stopped, the active WUs were at 50.2 / 46.2 / 36.8 / 29.9 percent.
Thus the score is 13.63 WUs / 10 minutes.

3 WUs at once:
Memory 937 MB / 743 MB
GPU Load 98-99%

12 WUs completed. When the timer stopped, the active WUs were at 39.3 / 30.3 / 28.9 / 27.7 / 25.0 / 17.7 percent.
Thus the score is 13.69 WUs / 10 minutes.

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