The CPUMark 99 section of Winbench 99 serves to stress the integer performance of the tested processor. Since the floating-point unit (FPU) has been taken out of the mix, higher CPUMark 99 scores will mostly show up with business applications or standard 2D games. Here the Celeron 600 lives up to its value market position and is simply outclassed by even the slowest Pentium III Coppermine. In a twist that is destined to become very familiar, the overclocked Celeron 550 actually surpasses the Celeron 600 CPUMark 99 score. This points to the importance of the 100 MHz FSB in basic Windows integer performance.

With 3D games dominating the retail shelves, the importance of floating-point calculations cannot be stressed enough. FPUMark 99 tests the CPU's FPU and scores usually correspond closely to the core speed of the processor. Keeping to this trend, the Celeron 600 easily stays close to the Pentium III 600E and outpaces both the Celeron 500 and 550 scores. Neither the Celeron 600's 128K L2 cache nor its 66 MHz FSB seem to hamper it in this test.