Geforce GTX 660ti - 2G GDDR5/192 bit RAM - How many units at a time?


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Message boards : Number crunching : Geforce GTX 660ti - 2G GDDR5/192 bit RAM - How many units at a time?

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outlaw
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Message 1315203 - Posted: 14 Dec 2012, 19:10:27 UTC

<type>CUDA</type>
<count>.5 ???</count>
</coproc>


How many units at a time do you have on your rigs?
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Grant (SSSF)
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Message 1315257 - Posted: 14 Dec 2012, 22:04:08 UTC - in response to Message 1315203.


2GB of RAM will allow you to do 3 at a time without slowing the system down for general useage.
My GTX460 with 1GB RAM does 2 at a time with no problems. I ran 3 at a time for a while, but every now & then it would run low on video RAM when things got busy & the system would hit a wall & barely crawl along till some video RAM was freed. With 2GB of RAM it would have run 3 with no problems.
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Message 1315321 - Posted: 14 Dec 2012, 23:49:14 UTC
Last modified: 14 Dec 2012, 23:50:06 UTC

I have GTX 460 2GB, you can run 6 easily, I think there will be enough RAM on the video card to run 7. Use GPU-z to watch your RAM on the video card.

I have switched to running just one though. It seems to work faster overall.

GPU-z: http://www.techpowerup.com/downloads/SysInfo/GPU-Z/




What to look for:


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Grant (SSSF)
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Message 1315325 - Posted: 15 Dec 2012, 0:09:49 UTC - in response to Message 1315321.

I have switched to running just one though. It seems to work faster overall.

For me on both the 460 & 560Ti, running 3 at a time gives the greatest throughput.
No matter how fast you can do 1 at a time, running 3 at a time will result in more being done per hour than just running one. It's slightly better than just running 2 at a time, two is much better than 1.
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Message 1315329 - Posted: 15 Dec 2012, 0:18:00 UTC - in response to Message 1315325.

I have switched to running just one though. It seems to work faster overall.

For me on both the 460 & 560Ti, running 3 at a time gives the greatest throughput.
No matter how fast you can do 1 at a time, running 3 at a time will result in more being done per hour than just running one. It's slightly better than just running 2 at a time, two is much better than 1.

Hey Grant. I think we talked about that before.

If I remember right I switched to running just one because I also play games so I needed the card to run a wu and game client at the same time.
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Message 1315373 - Posted: 15 Dec 2012, 1:34:08 UTC
Last modified: 15 Dec 2012, 1:35:36 UTC

I have a GTX660SC/2Gb & a GTX460SE/1Gb running 3 tasks each with no problems, keeping 1 core free for GPU processing. As far as games, which are very simple, or watching DVDs I also suspend GPU processing via the Tools menu. When running 3 tasks temps are around under 68c for the 660SC and under 60c for the 460SE, GPU usage is at 99%. Always had problems running Cuda and playing games or watching DVDs at the same time.
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Message 1315447 - Posted: 15 Dec 2012, 5:55:08 UTC

Ok, some testing. Again. This is GTX 460 with 2048 MB (2 GB) of RAM on the video card.

1 wu


2 wu


3 wu


4 wu


5 wu


6 wu


7 wu


8 wu



Each wu uses about 238 MB of video ram.

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Message 1315497 - Posted: 15 Dec 2012, 9:33:37 UTC

Spitfire - your screen shots (if that's what they were) aren't visible.



While the GPU may be capable of holding a number of tasks in memory it will have a sweet spot in terms of performance, below which the processors aren't being fully used, and above which they are doing too much task swapping. You need to run a few WU through at each number and monitor their completion times, then work out the effective throughput in terms of WU per hour.

I did this some time ago on my 460, and while I could get four into the GPU memory the performance fell off so quickly above two it just wasn't worth it so I settled on two as being the optimum. From memory the execute times were something like 19mins for 1 task, 20mins for two, and 40mins for three tasks, which gave me three per hour, six per hour and three per hour respectively (I went no further as it was obvious that I'd hit a limit)
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Richard HaselgroveProject donor
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Message 1315515 - Posted: 15 Dec 2012, 10:22:06 UTC - in response to Message 1315497.

Spitfire - your screen shots (if that's what they were) aren't visible.

They're visible here (and I'm in the same country as Rob). My ISP is BT: it's possible that the problem is between Rob's ISP and the image server at i.imgur.com

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Message 1315707 - Posted: 15 Dec 2012, 19:41:17 UTC - in response to Message 1315515.

Spitfire - your screen shots (if that's what they were) aren't visible.

They're visible here (and I'm in the same country as Rob). My ISP is BT: it's possible that the problem is between Rob's ISP and the image server at i.imgur.com


And they are visible here (and I'm in different country as Rob)
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Message 1315890 - Posted: 16 Dec 2012, 5:57:51 UTC - in response to Message 1315707.

Spitfire - your screen shots (if that's what they were) aren't visible.

They're visible here (and I'm in the same country as Rob). My ISP is BT: it's possible that the problem is between Rob's ISP and the image server at i.imgur.com


And they are visible here (and I'm in different country as Rob)

Same here, If they'd been png files I'd think it was an old browser incompatibility problem, in any case I agree.
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Message 1316123 - Posted: 16 Dec 2012, 17:40:29 UTC

Blocked as adverts!!!

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Message 1317740 - Posted: 20 Dec 2012, 19:01:21 UTC

How do you configure this?

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Message 1317816 - Posted: 20 Dec 2012, 21:01:53 UTC

I also have a geforce gtx 660ti - 2G GDDR5/192 bit RAM and can only run 1 seti unit at a time .I want to know how to set set it up to run more , I don't have lunatic and we can't download it now .
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Message 1318163 - Posted: 21 Dec 2012, 14:44:10 UTC - in response to Message 1317816.

It's a simple change to an XML file, you'll get a detailed response from the pros here; and I do not believe you need a Lunatics build to configure this.
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Message 1318184 - Posted: 21 Dec 2012, 15:48:49 UTC - in response to Message 1318163.

It's a simple change to an XML file, you'll get a detailed response from the pros here; and I do not believe you need a Lunatics build to configure this.

While the change is easy, the file doesnt exist if you are running the stock apps...
As was said, you dont need to use the Lunatics optimized apps, but you need to use the anonimous plattaform which implies the creation of the whole app_info file and to loose the automatic upgrades of the stock apps... all this without a helper installer might be a serious burden for non advanced users...
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Richard HaselgroveProject donor
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Message 1318189 - Posted: 21 Dec 2012, 16:07:51 UTC - in response to Message 1318184.

It's a simple change to an XML file, you'll get a detailed response from the pros here; and I do not believe you need a Lunatics build to configure this.

While the change is easy, the file doesnt exist if you are running the stock apps...
As was said, you dont need to use the Lunatics optimized apps, but you need to use the anonimous plattaform which implies the creation of the whole app_info file and to loose the automatic upgrades of the stock apps... all this without a helper installer might be a serious burden for non advanced users...

Or you could use the new BOINC 7.0.40-42 and new app_config.xml, and run multiple tasks without losing automatic updating.

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Message 1318251 - Posted: 21 Dec 2012, 17:49:03 UTC - in response to Message 1317740.

How do you configure this?

I used the Lunatics installer. That created app_info.xml file that I edit to run the number of wu I want.
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Message boards : Number crunching : Geforce GTX 660ti - 2G GDDR5/192 bit RAM - How many units at a time?

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