There are a few running projects on the GPU client right now, but only 3 point values for the different projects. Figures from an overclocked 9800GX2: 353 point WU (6099PPD), 384 (5266PPD) and 511 (3940PPD). As you can see, the higher scoring WU's almost chop the PPD output in half.
Oh right, thanks for that, The current one I am doing is 511 which explains why I am getting less