That's not the same thing. Try 8x on RITEKG05 and torture your IDE channels and CPU by encoding HDTV files to DivX or WMV and play multiple HD 1920*1080 WMV files at once while burning the RITEKG05. And then you'll probably get something like 1x.
Slow speed for 8x-16x media also means improper write quality. Neither the media manufacturer or drive manufacturer guarantees good quality or safe recording if you don't choose what they recommend.