As if luck would have it, a workunit put two cards together that are virtually the same, but GTS250 should have the edge due to the 55nm board. However, looking at the results below suggests I am wrong:

From GTS250 Task ID 432911

core_client_version>6.6.15</core_client_version>
<![CDATA[
<stderr_txt>
# Using CUDA device 0
# Device 0: "GeForce GTS 250"
# Clock rate: 1890000 kilohertz
# Total amount of global memory: 1073414144 bytes
# Number of multiprocessors: 16
# Number of cores: 128
# Time per step: 141.641 ms
# Approximate elapsed time for entire WU: 88525.497 s
called boinc_finish

</stderr_txt>
]]>

<core_client_version>6.4.5</core_client_version>
<![CDATA[
<stderr_txt>
# Using CUDA device 1
# Device 0: "GeForce 9800 GTX/9800 GTX+"
# Clock rate: 1890000 kilohertz
# Total amount of global memory: 536608768 bytes
# Number of multiprocessors: 16
# Number of cores: 128
# Time per step: 60.070 ms
# Approximate elapsed time for entire WU: 37543.545 s
called boinc_finish
</stderr_txt>
]]>

• Number of multiprocessors
  
• Clock Rate
  

Things that are different:

• Boinc Version
  
• Global Memory
  
• Time Per Step
  
• Elapsed Time
  

Anyone have any idea why the GTX9800+ would perform over twice as fast?

Note: I am running two other projects at the same time (one which is CPDN), but I have 3Gb of memory so I didn't think it is the factor in this instance?

Rob

I think that these cards are identical, GTS250, and 9800GTX+.

Do you have any other 3D software running (game) while running GPU-Grid?

Was the wall clock time really ~24h?

I think that these cards are identical, GTS250, and 9800GTX+.