This long IBUCH task only used about 66% GPU,
2516372 1589721 16 Jun 2010 4:53:58 UTC 16 Jun 2010 12:25:38 UTC Completed and validated 18,054.61 17,668.78 7,954.42 11,931.63 ACEMD2: GPU molecular dynamics v6.05 (cuda30)

The shorter OTTO and TONI_HERG tasks seems to be about 8% faster and use more GPU.

I have recently joined the "Fermi Club" with a new computer that has 2 480 cards. I am running Windows 7 64 bit professional OS, with 257.21 drivers and boinc version 6.10.56. The cards run at .81 Ghz and take an average of over 5 hours to complete a work unit. This compares to my Windows XP professional 32 bit, with a 195.62 drivers, boinc version 6.10.56 and a 285 card, which completes the work unit in about 3.5 hours. I noticed that some of you, who are running the Fermi 470 and 480 cards on Windows XP machines, have clock speed of 1.4 Ghz and finish the work units in about 2.5 hours. Is this because of Windows XP allows the unit to run faster or did you tweak your machine some how? If you tweaked it, how did you do it?

Congratulations, you have an excellent computer!
WinXP is MUCH faster than Vista/ Win7.
The best you can do with Win7 is to make sure you create an environmental variable called SWAN_SYNC and make the value be 0. Then, if you are crunching CPU projects set BOINC Manager to use 1 less thread than your machine really has.

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Thanks - Steve

I have one GTX470. It is overclocked to the same speed as your GTX480 cards. So the main difference in terms of performance is that I have 32 less shaders. On XP each one of your cards (at stock speeds) should run about 7% faster than mine.

One of my tasks:
2602526 1654070 1 Jul 2010 22:53:58 UTC 2 Jul 2010 3:57:16 UTC Completed and validated 8,740.36 8,518.66 4,503.74 6,755.61 ACEMD2: GPU molecular dynamics v6.05 (cuda30)

A similar one of your tasks:
2601422 1653413 1 Jul 2010 18:24:55 UTC 2 Jul 2010 5:01:03 UTC Completed and validated 19,248.47 4,317.52 4,503.74 6,755.61 ACEMD2: GPU molecular dynamics v6.05 (cuda30)

As you can see, your time of 19248 seconds is much slower than my time of 8740 seconds. This is down to using Windows 7. If you ran the same task on Win XP it should take about 8128seconds (7% faster than my overclocked GTX470). As is, my one GTX470 is doing about 10% more work than both of your GTX480's put together!
I hope this makes it vividly clear what you must do.

I use EVGA Precision to overclock my cards, but there are several other good overclocking tools available.

instructions for using swan_sync

Bedrich, I suppose you could try the latest Win7 x64 Beta driver, but I would not hold my breath.
At least it reports the specs correctly!

Thanks for the suggestions, but it seems to me that the problem is with the Windows 7, and until Nvidia and / or Boinc upgrades their software to fix this problem, I am stuck with this.

The thing about windows 7 (and Vista) is that they use DirectX 10.1 (or 11 if you have a Fermi) to speed up some system tasks and apps. This includes the GUI (AERO). I think I tried to turn DirectX off and run a Fermi tasks, and it made no difference, but I can't remember for sure. I know on one Vista system I have a corrupt Aero installation, that won't uninstall fully or upgrade. No doubt it has integrated itself too deep. Anyway, I am not going back to Win7 with my Fermi.
It might be interesting to try booting to Safe Mode with Networking and running a Fermi WU.
An advanced NVidia driver installation, where you could select what you actually install might help!