If you have an existing GPU folding installation simply stop the client (don't pause it, do a full stop/quit). If you are using the normal client you just need to go to start, program files, folding@home-gpu and click on the "data files only". Once there delete Fah_Core11.exe. Close the window and start your gpu folding again, it will download the latest and greatest.
Stanford is reporting 6-11% increase, I personally see ~500ppd for each of my GPU's.
It's going to look like it downloaded the same thing but it will be fine and be faster.
This is from one half of a 9800GX2.[21:25:39] Completed 10%
[21:26:54] Completed 11%
[21:28:09] Completed 12%
[21:29:24] Completed 13%
[21:30:39] Completed 14%
[21:31:55] Completed 15%
[21:33:10] Completed 16%
[21:34:25] Completed 17%
[21:35:40] Completed 18%
Folding@Home Client Shutdown.
--- Opening Log file [October 13 21:36:23 UTC]
# Windows GPU Console Edition #################################################
###############################################################################
Folding@Home Client Version 6.20r1
http://folding.stanford.edu
###############################################################################
###############################################################################
Launch directory: C:\Users\Bwall\AppData\Roaming\Folding@home-gpu
Arguments: -gpu 0
[21:36:23] - Ask before connecting: No
[21:36:23] - User name: wickedld9 (Team 38296)
[21:36:23] - User ID: 2595900683FC9F6
[21:36:23] - Machine ID: 2
[21:36:23]
[21:36:23] Loaded queue successfully.
[21:36:23] Initialization complete
[21:36:23]
[21:36:23] + Processing work unit
[21:36:23] Core required: FahCore_11.exe
[21:36:23] Core not found.
[21:36:23] - Core is not present or corrupted.
[21:36:23] - Attempting to download new core...
[21:36:23] + Downloading new core: FahCore_11.exe
[21:36:24] + 10240 bytes downloaded
[21:36:24] + 20480 bytes downloaded
[21:36:24] + 30720 bytes downloaded
[21:36:24] + 40960 bytes downloaded
[21:36:24] + 51200 bytes downloaded
[21:36:24] + 61440 bytes downloaded
[21:36:24] + 71680 bytes downloaded
[21:36:24] + 81920 bytes downloaded
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[21:36:25] + 102400 bytes downloaded
[21:36:25] + 112640 bytes downloaded
[21:36:25] + 122880 bytes downloaded
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[21:36:25] + 143360 bytes downloaded
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[21:36:25] + 624640 bytes downloaded
[21:36:25] + 634880 bytes downloaded
[21:36:25] + 640343 bytes downloaded
[21:36:25] Verifying core Core_11.fah...
[21:36:25] Signature is VALID
[21:36:25]
[21:36:25] Trying to unzip core FahCore_11.exe
[21:36:25] Decompressed FahCore_11.exe (1822720 bytes) successfully
[21:36:30] + Core successfully engaged
[21:36:35]
[21:36:35] + Processing work unit
[21:36:35] Core required: FahCore_11.exe
[21:36:35] Core found.
[21:36:35] Working on queue slot 06 [October 13 21:36:35 UTC]
[21:36:35] + Working ...
[21:36:35]
[21:36:35] *------------------------------*
[21:36:35] Folding@Home GPU Core - Beta
[21:36:35] Version 1.15 (Mon Oct 13 11:11:30 PDT 2008)
[21:36:35]
[21:36:35] Compiler : Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for 80x86
[21:36:35] Build host: amoeba
[21:36:35] Board Type: Nvidia
[21:36:35] Core :
[21:36:35] Preparing to commence simulation
[21:36:35] - Looking at optimizations...
[21:36:35] - Files status OK
[21:36:35] - Expanded 45568 -> 246249 (decompressed 540.3 percent)
[21:36:35] Called DecompressByteArray: compressed_data_size=45568 data_size=246249, decompressed_data_size=246249 diff=0
[21:36:35] - Digital signature verified
[21:36:35]
[21:36:35] Project: 5506 (Run 7, Clone 537, Gen 112)
[21:36:35]
[21:36:35] Assembly optimizations on if available.
[21:36:35] Entering M.D.
[21:36:41] Will resume from checkpoint file
[21:36:42] Working on p5506_supervillin_e1
[21:36:42] Client config found, loading data.
[21:36:42] Starting GUI Server
[21:36:42] Resuming from checkpoint
[21:36:42] Verified work/wudata_06.log
[21:36:42] Verified work/wudata_06.edr
[21:36:42] Verified work/wudata_06.trr
[21:36:42] Verified work/wudata_06.xtc
[21:36:42] Completed 18%
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[21:48:10] Completed 28%