Seti Cuda Optimized client slower?

[Shonk]

I have suspected for a while that the Optimized Cuda Client is slower than
the official one and did this unit earlier

http://setiathome.berkeley.edu/workunit.php?wuid=692713367

Whilst it did finish first
My device is running at 1890mhz (800core 2538 ram)
His is running at 1728mhz

Both are Nvidia G92's

What's everyone's opinion on this