I did a little comparison with the 2GB, 4GB and 8GB -cards. I tested two different adapters on Amiga and the same adapters on the PC, but there was no difference. I also tested the two different Amigas, A600 and A1200 (In both KS3.1). All the cards were emptied with diskpart before the test. Test programs were on the Amiga SCSIQuery and on the Win7x64 SeaTools for Windows.
http://s10.postimg.org/caw506qbd/2014_03_11_1426.jpg
Code:
8GB 4GB 2GB
WinUAE 15,523,200 7,626,528 3,841,488
A600 15,523,200 7,626,528 3,841,488
A1200 15,523,200 7,626,528 3,841,488
Win7x64 15,523,839 7,626,751 3,842,047