Posts by Ragnar Sandberg

1) Message boards : Number crunching : SETI@home on Ubuntu, only getting Astropulse WUs (Message 1444476) Posted 20 Nov 2013 by Ragnar Sandberg Post: Thanks for the suggestion! Hmm, I've already disabled the CPU tasks via berkeley.edu. I tried what you suggested, however, but no GPU work gets downloaded. The problem has to do with not receiving any other work units on my GPU besides the ones I get every now and then from Astropulse. I haven't been doing any CPU work for a long while, that's not the issue.
2) Message boards : Number crunching : SETI@home on Ubuntu, only getting Astropulse WUs (Message 1444461) Posted 20 Nov 2013 by Ragnar Sandberg Post: Hey, I've been running SETI@home for a while now, and on Windows 7 and XP I used to be able to run both Astropulse and "classic" SETI WUs. However, on Ubuntu I'm only able to run Astropulse. I remember fixing this very same problem on Windows with adding CUDA_GRID_SIZE_COMPAT as an entry in environment variables. I've always been running SETI@home with my Gigabyte Geforce GTX 660 OC. Is there any way to make "classic" units work on my GPU in Ubuntu rather than just the Astropulse ones? It takes 2-3 hours on one CPU core to complete a classic unit in Ubuntu, while on Windows these units would complete in 2-3 minutes on my GPU. I'm happy running Astropulse, but it would be nice to run SETI@home all week. I would very much appreciate any help you could give me! Your sincerely, Ragnar
3) Message boards : Number crunching : Changing PSU for dual graphics cards (Message 1441793) Posted 13 Nov 2013 by Ragnar Sandberg Post: Thanks for giving me some advice!
4) Message boards : Number crunching : Changing PSU for dual graphics cards (Message 1440926) Posted 10 Nov 2013 by Ragnar Sandberg Post: Hi there, I'm planning to upgrade my power supply in order to run two graphics cards for SETI@home and a few other BOINC projects. My current computer has a modular PSU, namely the Corsair TX550M (Bronze certified). The motherboard for this build is the GIGABYTE GA-Z77-D3H Z77 S-1155 ATX IVY, which does not support SLI for NVIDIA graphics cards. Initially, I'm tempted to buy the Corsair RM850 PSU. Currently, I run SETI@home on the Gigabyte GeForce GTX 660 and I would like to buy an additional card from the sames series since it seemingly is very cost efficient and cool. My questions are as follows: 1) Do I need to replace the power cables I currently have attached to my motherboard from the old PSU, or can I simply remove the PSU and keep the old cables for the new Corsair unit? If I could keep the old cables, it would be very easy indeed to upgrade my system. 2) Even if my motherboard does not support SLI, can I still run two 660s separately for BOINC GPU tasks? I would very much appreciate any help you can give me. Yours sincerely, Ragnar
5) Message boards : Number crunching : Gigabyte Geforce 660 OC vs Gigabyte Radeon 7970 OC (Message 1404676) Posted 18 Aug 2013 by Ragnar Sandberg Post: If you substract 30 Watts for the CPU mine is TDP 140 and another 25 for one HD you are still above 500 Watts. With only 10% room its just a question of time. Okay everyone, thank you for the help. I've decided to either upgrade my PSU as well, or wait until later. I appreciate the help. All the best, Ragnar
6) Message boards : Number crunching : Gigabyte Geforce 660 OC vs Gigabyte Radeon 7970 OC (Message 1404642) Posted 18 Aug 2013 by Ragnar Sandberg Post: My favorite other site is offline for maintenance, so use http://www.msi.com/service/power-supply-calculator/ to do the total minimal calculation of energy that your system uses. According to the site I'm currently using 281W with the 660, and I would be using 356W with the 7950. Is this basically telling me what my system uses while being idle? I only have 2 fans, 1 SSD, no additional PCI or PCI Express Cards, and only 1 DVD-ROM. I also use 1 high-end audio-technica headset. Based on this review, I guess my 550W PSU would not cut it: http://www.techspot.com/review/496-amd-radeon-7950/page9.html
7) Message boards : Number crunching : Gigabyte Geforce 660 OC vs Gigabyte Radeon 7970 OC (Message 1404492) Posted 17 Aug 2013 by Ragnar Sandberg Post: 550W is the recommended minimum PSU capability. I would think that a 670W PSU will give safety from burning out the PSU. At least it is the value I have for 24/7 crunch on my HD7970. Hmm, do you think opting instead for the HD7950, with 500W being the recommended minimum PSU capability, would still be pushing it?
8) Message boards : Number crunching : Gigabyte Geforce 660 OC vs Gigabyte Radeon 7970 OC (Message 1404481) Posted 17 Aug 2013 by Ragnar Sandberg Post: Yes, but AMD dont tell anything about the OC`d version. My card has two 8 pin power connectors. But you are correct of course. 250 for the card 125 for CPU plus 50 for the board. Not much room if not a 90+ PSU is in use. The company I'm ordering this card from states that the requirement is 550W, but if you're worried this might not be sufficient, maybe I should opt for the 7950 instead? However, the same company recommends a 550W PSU for the ASUS RADEON HD7970 DCII as well. With regards to my power supply, it's a Corsair 550 TX 550W 80 PLUS bronze certified.
9) Message boards : Number crunching : Gigabyte Geforce 660 OC vs Gigabyte Radeon 7970 OC (Message 1404415) Posted 17 Aug 2013 by Ragnar Sandberg Post: Hi there, I'm currently running Astropulse in SETI@home on a Gigabyte Geforce 660 OC 2 GB GPU in Linux Mint with 8 GB Corsair 1600 MHZ RAM, an Intel SSD in the 520 series, and the Intel Core i5-3450 CPU. Realistically, how much of an improvement would I get if I were to replace my GPU with the Gigabyte Radeon 7970 OC? My average time for each WU in Astropulse is currently 39 minutes. I see the 660 OC has 1881.6 GFLOPS, whereas the 7970 OC has 3788.8 GFLOPS. Also, the 660 OC has 960 cores, whereas the 7970 OC has 2048 cores. How much of an improvement could I expect? Is it too optimistic to expect the average time of completion for Astropulse WUs to drop to 20 minutes? My reasoning for upgrading to the 7970 OC specifically has to do with the fact that I'm limited to a 550W PSU. This card seems like it's going to give me the best bang for buck. I've also read online that AMD cards are considered better for crunching on BOINC, but I'm unsure as to whether or not this also applies to SETI@home. Could I get some advice on this? I've been crunching for little more than a year now, and I specifically built my current rig for GPU crunching mainly in SETI@home, Einstein@home and Milkway@home. Recently I've also started crunching for GPUGRID. So far I've completed 1,5M WUs in BOINC since April 2012. All the best, Ragnar
10) Message boards : SETI@home Science : What is your most interesting signal in MapView? (Message 1350665) Posted 25 Mar 2013 by Ragnar Sandberg Post: Hi there fellow SETI@home enthusiasts! I recently managed to get BjÃ¶rn Henke's MapView application to work alongside his BoincLogX application. I find this is a fun way to keep up my motivation for SETI@home, even if virtually all the signals eventually turn out to originate with planes or satellites. So what is YOUR most interesting signal as captured by BjÃ¶rn Henke's MapView? By interesting I mean the signal among the top 10 best signals in the software that you think somehow stands out. My own favorite signal overlaps probably by pure chance the direction of the star HD 145457. According to the German astrophysicist Hanno Rein's exoplanet app, there is one giant gas planet in the HD 145457 system with an orbital period of 176.30 days. The signal processed by SETI@home in all likelihood originated inside our very own Solar system, but I still find it fascinating that it seems to fit in the HD 145457 system so snugly. Here you have a screenshot of my most interesting signal to date: So, what is your favorite signal as illustrated by MapView?

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SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.