A PC stress test that shows what happens past 100%
When you stress test a PC's processor, a usage graph pinned at 100% tells you only that it is busy. It says nothing about speed. A modern chip that is boosting does more work per second at 100% than one sitting at its base clock, and one that is overheating can drop back while the graph stays flat.
Windows does measure the difference. Its processor utility counter is scaled to the base clock, so a core running faster than base reads above 100. Most monitors cut that number off at 100. Blaze CPU Stress Test opens the counter itself with the cap removed and shows the share above 100 as CPU Boost, to two decimal places, for as long as the test runs.
The load comes from worker threads, one per core you ask for. Each spins for 99 milliseconds out of every 100 and rests for 1, so the demand is steady instead of arriving in bursts. Threads are not pinned, so Windows schedules them the way it schedules everything else.
How to max out a CPU for a stability check
The window centers on a gas burner. Its head has one flame port for each core under test, up to sixteen, and each port brightens with the load on its core while the flame rises as total load climbs.
- Set Number of Cores: anything from 1 up to the number of logical processors Windows reports. The value is remembered for next time.
- Click the burner head, or Start Stress Test, to light it.
- Watch the headline, which reads Burning and the core count with total load, and the elapsed time and boost underneath.
- Click the burner again, or Stop, to end the run. Closing the window ends it too, so nothing keeps running in the background.
What a falling CPU Boost number tells you
Early in a run, a chip with good cooling usually shows its highest boost. If the figure sinks over the next few minutes while load stays near full, the processor is pulling its clocks back, most often because of heat or a power limit. A boost that holds steady suggests the cooling has headroom to spare.
Compare runs rather than single numbers: one core against all cores, a laptop propped up on a stand versus flat on a bed, or the same PC before and after cleaning the fans. Above the per-core bars the app names your processor, counts its cores, shows the performance and efficient core split on hybrid chips and gives the base clock in GHz, so you can note the setup alongside the result.
The app does not read temperatures and does not produce a benchmark score.
Running a CPU burn test on a laptop
A full-load run drains a battery fast. The Battery Level row gives the charge and says whether the machine is Charging, Plugged in or On battery power. In Settings, turn on Stop the test at 20% battery and the run ends by itself once the charge drops under that mark, with a note saying why it stopped.
