Questions and Answers :
GPU applications :
Crossfire or run separate?
Message board moderation
Author | Message |
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Zapp3012 Send message Joined: 26 Sep 15 Posts: 5 Credit: 2,607,739 RAC: 0 |
First post, so sorry if asked before, I just joined today. I put together a low price PC that I plan to run 24/7 just to run seti. It's an AMD A6-7400K, and set up went smoothly. It's crunching away now, running 3 work units. (2 CPU and 1 GPU). I have an R7 240 card that I'm not using. If I put it in, would I be better to leave it as a lone card, or Crossfire it with the APU? I've checked, and the R7 can Crossfire with the APU's R5. Thanks. |
rob smith Send message Joined: 7 Mar 03 Posts: 22219 Credit: 416,307,556 RAC: 380 |
Run separate is generally better than linking using Crossfire (for AMD GPUs) OR SLI (for Nvidia GPUs). Bob Smith Member of Seti PIPPS (Pluto is a Planet Protest Society) Somewhere in the (un)known Universe? |
Zapp3012 Send message Joined: 26 Sep 15 Posts: 5 Credit: 2,607,739 RAC: 0 |
Thanks. In that case, I may have a better card I could use. It's not Crossfire compatible with the APU, but it's more powerful than the R7 240 I was going to use. It's a Radeon 7750. If I plug that in, will it disable my onboard GPU? Is there anything I need to do to use both of them? Thanks for your help. |
rob smith Send message Joined: 7 Mar 03 Posts: 22219 Credit: 416,307,556 RAC: 380 |
Generally the internal GPU will not be disabled by installing an external one, but this very dependent on the motherboard in question. Bob Smith Member of Seti PIPPS (Pluto is a Planet Protest Society) Somewhere in the (un)known Universe? |
Zapp3012 Send message Joined: 26 Sep 15 Posts: 5 Credit: 2,607,739 RAC: 0 |
Thanks for your help, I'm making progress. But if I could impose on you for one more question... I now have both GPU's showing in system properties, but BOINC is only using the onboard one. In the event log it says..... OpenCL: AMD/ATI GPU 0 (ignored by config) CapeVerde OpenCL: AMD/ATI GPU 1: Spectre So it seems it's ignoring the 7750 card (CapeVerde). Could you explain how I tell it to use both? Thanks again for your help. |
Zapp3012 Send message Joined: 26 Sep 15 Posts: 5 Credit: 2,607,739 RAC: 0 |
Actually I think I've fixed it. The 7750 is now being used, although my computer stat page now says I have 2 Spectre GPU's, rather than 1 Spectre and 1 CapeVerde. But at least it's working. |
rob smith Send message Joined: 7 Mar 03 Posts: 22219 Credit: 416,307,556 RAC: 380 |
Now you've got both working let it stabilise for a few days before trying anything else as sometimes problems don't show up at first. Bob Smith Member of Seti PIPPS (Pluto is a Planet Protest Society) Somewhere in the (un)known Universe? |
BilBg Send message Joined: 27 May 07 Posts: 3720 Credit: 9,385,827 RAC: 0 |
my computer stat page now says I have 2 Spectre GPU's, rather than 1 Spectre and 1 CapeVerde. That is "normal" glitch of the page. BOINC starts tasks for both and the app detects them properly: device 0 (Capeverde) http://setiathome.berkeley.edu/result.php?resultid=4410465414 device 1 (Spectre) http://setiathome.berkeley.edu/result.php?resultid=4410465413 device 0 and then 1 http://setiathome.berkeley.edu/result.php?resultid=4410684800 Â Â - ALF - "Find out what you don't do well ..... then don't do it!" :) Â |
Zapp3012 Send message Joined: 26 Sep 15 Posts: 5 Credit: 2,607,739 RAC: 0 |
I see. Thanks for clearing that up. Seems all is going well. |
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