A processor’s spec sheet is the maker’s statement about the chip. It is not a measurement of how your games will run, how much power they will draw or how hot the chip will get. This guide separates three kinds of figures: what the maker advertises, what independent reviewers measured for power, and what they measured for performance. It then lists the compatibility checks that decide whether a processor fits your build.

Gimaxo has not tested any processor, so every measurement below belongs to a named reviewer. Three processors are used as dated examples: the AMD Ryzen 7 9800X3D (launched November 7, 2024), the AMD Ryzen 7 9850X3D (launched January 29, 2026) and the Intel Core Ultra 9 285K (launched in the fourth quarter of 2024). They are examples read on the makers’ pages on November 6, 2026. They are not recommendations, a ranking or a statement of either maker’s current lineup. Where a sentence starts with “Our reading:”, it is this guide’s own conclusion, drawn from the source named just before it.

Illustration of a processor in its socket, not a photograph of a real build.

What the makers advertise

On their product pages, AMD lists the Ryzen 7 9800X3D and the Ryzen 7 9850X3D with 8 cores, 16 threads, 96 MB of L3 cache and a default TDP of 120 W. Both list the AM5 socket, DDR5 memory and integrated Radeon graphics with 2 cores. Intel lists the Core Ultra 9 285K with 24 cores (8 performance and 16 efficiency), 24 threads, a maximum turbo frequency of 5.7 GHz, the FCLGA1851 socket and integrated Intel graphics.

Power figures use different systems. AMD lists a default TDP. Intel lists a base power of 125 W and a maximum turbo power of 250 W for the 285K. Our reading: these figures help you plan a power supply and a cooler. They do not rank processors, and they are not a prediction of what a game will draw.

What a reviewer measured for power

TechPowerUp, in its Ryzen 7 9850X3D review (W1zzard, January 28, 2026), measured power at the 8-pin EPS input that feeds the processor, which it labels “CPU only”, not full system. In this guide the figures are the power measured at the EPS input feeding the processor. They are not the consumption of the whole PC, since they leave out the graphics card and the other parts, and they are not necessarily the power of the silicon alone, since the protocol does not say that the board’s power circuitry is excluded. Its AMD test system used an ASUS X870E Crosshair Hero (BIOS 9958), 2x16 GB DDR5-6000 and a GeForce RTX 5090. The Intel system used an ASUS Z890 Maximus Hero (BIOS 2302) with Intel stock power settings and Core 200S Boost enabled. Processors ran at stock settings.

• Gaming, average of 14 tests: 80 W for the 9800X3D, 102 W for the 9850X3D and 111 W for the 285K.
• Applications, average of 50 tests: 88 W, 97 W and 133 W.
• Multithreaded load: the review says both AMD processors reach around 150 W.

Compare these with the advertised figures above. The 120 W default TDP is not what the AMD chips drew under a multithreaded load in this review, and the gaming averages are below it. Limits: one sample of each processor, one board per platform and TechPowerUp’s own workloads. Our reading: advertised power, measured consumption and your own consumption can all differ, so treat each as a separate number.

What a reviewer measured for performance

In the same review, a chart of relative gaming performance at 1920x1080, with the RTX 5090 at Ultra settings, uses the Ryzen 7 9850X3D at stock settings as its 100.0% reference. The Ryzen 7 9800X3D reads 98.9% of that reference and the Core Ultra 9 285K reads 85.1%. The 9850X3D with PBO Max and a Curve Optimizer offset of -35 reads 101.1%. The review notes that the RTX 5090 is not the right card for 1080p, and that its test exposes the processor limit. At 4K it says the bottleneck shifts from the processor to the graphics card, with only around 10% between the entries in its test group.

Our reading: each percentage is a score for the named processor against that reference, in one game suite, with one graphics card and one memory setup. It does not predict results with another graphics card, another game or another resolution. For your build, find a review whose graphics card, games and settings are close to yours.

What TOPS means, and what it does not

TOPS stands for tera operations per second, a count of trillion operations a processor can perform each second on a given task. The same unit can describe an NPU, a GPU or a whole platform, and the numbers are not interchangeable. Intel lists the 285K at 13 NPU peak TOPS, 8 GPU peak TOPS and 36 overall peak TOPS (Int8). Microsoft’s Copilot+ PC guide says many of the new Windows AI features require an NPU able to run at 40+ TOPS, so the 13 TOPS NPU figure is the one that applies there. The TechPowerUp review lists “No NPU for AI acceleration” among the 9850X3D’s cons.

TOPS is not a measure of gaming performance, and neither of these figures says how a game will run.

Illustrative monitoring display, not measured benchmark results.

Check platform compatibility

• Socket and board. AMD lists AM5 for both Ryzen processors, with the A620, X670E, X670, B650E, B650, X870E, B840 and B850 chipsets. AMD’s blog of May 31, 2026 says it extends support for the AM5 platform through 2029. That describes a platform commitment, not a promise that every future processor works in every board. Intel lists FCLGA1851 for the 285K. The sockets are not interchangeable. Check the board maker’s CPU support list and required BIOS version. TechPowerUp adds that the only thing to confirm for the 9850X3D is that the board’s voltage regulators can provide 170 W.
• Memory. Both platforms use DDR5. AMD lists DDR5-5600 with two modules and DDR5-3600 with four. Intel lists “Up to DDR5 6400 MT/s”. What your PC runs at depends on your kit and board. Our guides to RAM and memory profiles cover how to read and check those figures.
• Cooling. AMD’s product pages list “Liquid cooler recommended for optimal performance” and a 95°C maximum operating temperature for the 9800X3D and 9850X3D. That is a recommendation on the product page, and the pages Gimaxo read do not call it a requirement. Our cooling guide covers how to check fit.
• Integrated graphics. AMD lists integrated Radeon graphics with 2 cores on both Ryzen processors, and Intel lists integrated graphics on the 285K. Check the product page for display outputs before you rely on them.

Illustration of platform parts laid out together, not a photograph of a real build.

Where to find measured results

For a new build you cannot test the processors you do not own. Read independent reviews, and note for each one the processor, the graphics card, the games, the resolution, the settings, the memory and the date. The two reviews above are examples of what a protocol looks like. If you already own a PC and want to find what limits it, start with our gaming PC performance guide.

What this guide does not cover

Prices, laptop and ARM processors, other models than the three examples, and AI features beyond the meaning of TOPS. Models and availability change, so confirm the details on the maker’s page before you buy.

Before you buy

1. Read the maker’s page for the exact processor, and note its socket, memory support and cooling listing.
2. Check the board maker’s CPU support list and BIOS version.
3. Check that your power supply and cooler fit the advertised figures, then look for measured power in a review.
4. Look for performance reviews that match your graphics card, games and resolution.
5. Do not use TOPS to judge gaming performance.

Sources

Named here as plain text. Pages read on November 6, 2026 unless stated.

• AMD, Ryzen 7 9800X3D and Ryzen 7 9850X3D desktop processor pages
• AMD blog, “AMD Computex 2026: 10 Years of AM4, AM5 Support Through 2029 and Expanded RDNA 4 Gaming”, May 31, 2026
• Intel, Core Ultra 9 processor 285K specifications page
• Microsoft Learn, Copilot+ PCs developer guide (NPU devices)
• TechPowerUp, “AMD Ryzen 7 9850X3D Review - The Best Just Got Better”, W1zzard, January 28, 2026, including its test setup, its power and relative performance charts and its conclusion