That says to me that it's faster at doing nothing than compressing
I think that the important concept is that Winzip's OpenCL code path doesn't actually use GPU for compression.
In my opinion, AMD and Corel marketing materials are misleading at this time.
I hope that next version promptly rectify that, with a good example of GPGPU!
Anyway, compression rates and relative performances always vary among various data sets.
JPEGs are almost uncompressable
For my data set, JPEG's compression was above 20%.
I don't think PCM should be especially compressible using zip methods
I found compression rate of about 45-50%, so roughly comparable to lossless audio codec such as Flac, Monkey's audio and WavPack.