After install a 2nd NVVIDA FX1800 on Vista SP1 with BOINC 6.10.18 I've modified the cc_config.xml file adding a row:

<use_all_gpus>1</use_all_gpus>

and then re-read the config file:

6/18/2010 12:54:56 PM Re-reading cc_config.xml
6/18/2010 12:54:56 PM Re-read config file
6/18/2010 12:54:56 PM Config: use all coprocessors
6/18/2010 12:54:56 PM log flags: file_xfer, sched_ops, task

but Collatz continue running only 1 WU.
notice that vista, GPU-Z and HWmonitor see correctly the 2nd FX1800.

I've also restart BOINC and on startup log see only one log message:

NVIDIA GPU 0: Quadro FX 1800 (driver version 19100, CUDA version 2030, compute capability 1.1, 768MB, 176 GFLOPS peak)

seems lack a 2nd message type "NVIDIA GPU 1: ...", right ?

Did you connect a monitor or dummy plug to the second card?

Did you extend the desktop across them?

See also Only using one of two GPUs.

Gruß,
Gundolf

---

Computer sind nicht alles im Leben. (Kleiner Scherz)

Did you connect a monitor or dummy plug to the second card?

Ok, this was the problem. Now the GPUs works.

Thank you.

---