Okay, if you don't believe me that the Sempron outpaces the Celeron D, then I'll show more evidence:
"The AMD Sempron 2800+ system did win all the gaming value results here, but both UT2003 and 3D Mark 2001 were very close and thus could be considered a tie. The Quake III results stand out showing you that the similar priced Sempron system can give you a 53% better FPS / $ gaming system for your money. "
"This next table shows some application testing results and the corrolating price / performance ratios. The Sempron 2800+ system has a 20% better ratio than the Celeron D system on Business Winstone but the Celeron wins over the Sempron in the PCMark04 test by about 5.5%."
And giving the beloved Celeron D one little thing... DivX.. but nothing else...
This table shows two additional benchmarks and their price / performance comparisons. The first is MP3 encoding, and since it's based on time, and the lower the score the better, the lower the ratio the better. So the Sempron 2800+ system wins that result, though the Celeron D 335 system is faster than the Sempron system for DivX encoding.