TL;DR: Extreme percentages often mean edge-case pairing, missing data, or resolution extremes—not literal zero usage. Re-check inputs on bottleneckcalculator.work before panic upgrades.
100% CPU bottleneck scenarios
Flagship GPU with decade-old CPU at 1080p low—expected extreme. Also check mis-selected low-power mobile CPU entry for desktop chip.
100% GPU bottleneck scenarios
Weak discrete or integrated GPU at 4K ultra with strong CPU—expected. Integrated graphics gaming always GPU-side limited at native res.
0% readings and null states
Some UIs show zero when data incomplete or pair so balanced tool rounds down—read help text. True zero utilization never happens in active games.
Both extremes simultaneously
Usually input error or bug—reselect components, change resolution one step, refresh page.
Translating extremes to action
100% flags mean upgrade that component for target resolution or lower resolution/settings—not that other part is useless.
Test it once more: bottleneck Results at 0% or 100% Explained
Extreme percentages signal mismatch or data quirks—validate inputs on bottleneckcalculator.work then benchmark.
100% CPU scenarios
Old CPU new GPU 1080p low—expected extreme.
100% GPU scenarios
iGPU or weak GPU 4K ultra—expected.
0% UI quirks
Incomplete data or rounding—read help.
Both 100% input error
Reselect components and resolution.
Extreme to action map
100% means upgrade that side or lower res/settings.
Screenshot extremes for forum
Include input panel when asking advice.
Extreme percentages decoded
100% CPU at 1080p low with old CPU and new GPU expected. 100% GPU at 4K ultra on weak card expected. Both 100% often input error—reselect components.
Screenshot input panel when asking forums about extremes—advice without resolution context guesses wrong parts confidently versus Bottleneck Calculator screenshots.
0% rows may mean rounding or incomplete data—read FAQ before panic.
A Pentium Gold G6400 beside an RTX 4090 at 1080p low
Type a joke that people accidentally build: Pentium Gold G6400, 8 GB of single-channel DDR4, and an RTX 4090, with the form set to 1080p and low settings. A reading at or near the top of the CPU scale is the tool working, not a bug. The 4090 has nothing to do in that scene, and the G6400 cannot prepare frames fast enough to matter. The shopping response is not a second 4090. It is to undo the mismatch. If you truly own the 4090, the next money is a modern platform and a dual-channel kit of at least 16 GB, and you should also ask whether you will move to 1440p or 4K so the card has pixels. If you truly own the G6400 and the 4090 was a hypothetical, delete the hypothetical. A GTX 1650 or an RX 6600 is a saner partner for that chip at 1080p, and only after the memory is two sticks.
What the extreme still does not prove
The huge CPU-side number does not prove the G6400 is defective. It proves the pair is absurd at that resolution and preset. It also does not prove every Pentium-era office PC needs a flagship CPU. Match the card to the panel you have. A 60 Hz 1080p office monitor will never display the frames a 4090 can prepare once a real CPU is installed. People buy the halo card, see the extreme label, and then buy a halo CPU for a 60 Hz screen. Write the refresh rate beside the extreme so the label cannot inflate the cart by itself.
A GT 1030 beside an i9-14900K at 4K
Reverse the joke. Intel Core i9-14900K, 32 GB of DDR5-6400, and a GT 1030, resolution set to 3840 by 2160. A reading pinned on the GPU side is correct. The 14900K is waiting on a card that was meant for video outputs and light desktops. No BIOS setting on the i9 will make 4K gaming appear. The shopping fix is a real graphics card with enough framebuffer for 4K, or a resolution you are willing to play that the 1030 can approach, which is not 4K. The 32 GB kit is already more than the 1030 can use. Do not add RAM because the number looks dramatic. Replace the card, or stop calling the machine a 4K gaming quote.
A 0 reading that is an empty menu
A zero on one side sometimes means the form did not receive a part. An RX 7800 XT selected, CPU left blank, 32 GB filled in, resolution 1440p, can produce a null that looks like a perfect processor. It is an unfinished row. Reselect the CPU, for example a Ryzen 5 7600, and run again. A zero after a real pair is different: it can mean the model has no confidence, or the UI rounded a small lean into nothing. Do not celebrate a zero as perfect balance, and do not fear it as a dead component, until the dropdowns show the chips you think you typed.
Both meters high because the memory field said 4 GB
Enter a sensible pair, Ryzen 5 5600 and RTX 4060, then set memory to 4 GB by mistake and resolution to 1080p. Some tools respond with nonsense extremes on both sides, or with warnings that do not look like the usual split. The chips are fine. The input is not a computer anyone should buy. Correct the field to 16 GB dual-channel DDR4-3200 and run again before you screenshot the scare for a forum. Extremes are allowed to mean “check the form” as often as they mean “check the hardware.” A second extreme that survives a careful retype, with the panel size you really own, is the one that may justify a part.
A U-series suffix selected for a desktop RTX 4090
An RTX 4090 desktop row combined with a low-power U-series mobile CPU, because the names looked similar in the list, will also pin the processor side at 1080p. That is an input error if the tower under your desk has a desktop chip. A 14900K and a U-series part are not the same shopping choice. Correct the suffix, keep the 4090, set the resolution to the panel you own, and only then decide whether the extreme survived. Most of the time it calms down once the desktop chip and a 1440p or 4K panel are what the form actually describes. Save that corrected pass under a new name so the first scare is not the screenshot you shop from next week.
