CPU_VS_GPU / 2026-09-11
Intel Core Ultra 5 245KvsAMD RX 7800 XT
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
20%
ESTIMATED GPU BOTTLENECK
Your GPU (RX 7800 XT) is the limiting factor at 2560x1440. In graphically demanding titles you will see lower frame rates; a faster GPU would deliver a clear improvement.
Load estimated by the model, not measured on your PC.
- PROCESSORIntel Core Ultra 5 245K
- GRAPHICSAMD RX 7800 XT
- MEMORY16GB DDR4/DDR5
- RESOLUTION2560x1440
Average across the demanding titles at 2560x1440.
Average across the competitive titles, where the processor leads.
What the build draws (538 W) plus headroom.
DEEP-DIVE ANALYSIS
GENERATED BY THE ENGINEThis page breaks down, number by number, what happens when you run an Intel Core Ultra 5 245K alongside an AMD RX 7800 XT. The processor scores 82/100 and the graphics card 45/100 in our model — the interesting part is how they split the workload at each resolution.
Quick take: 1440p is the resolution to target
At 1080p the two stay well balanced, whereas at 4K the RX 7800 XT is the limiting part (~48% GPU bottleneck). One number decides the purchase: 1440p is the most demanding of the standard 16:9 sizes that still sustains 66 FPS on average in AAA games, above the 60 FPS bar we treat as smooth. Step up a rung and the frame rate drops below that mark.
Resolution reshuffles the priorities. At 1080p the Core Ultra 5 245K's single-thread speed calls the shots; at 4K it's the raw muscle of the RX 7800 XT that matters. That shift shows up in the numbers: 99% efficiency at 1080p versus 52% at 4K.
Translated into actual games: In esports titles like Valorant this pair flies — around 757 FPS at 1080p, plenty for a high-refresh monitor. At the other end, a demanding AAA like Alan Wake 2 drops to ~25 FPS at 4K, which is where the RX 7800 XT's ceiling really shows. Overall, expect about 92 FPS average in AAA games at 1080p and around 44 FPS at 4K.
[CPU] Core Ultra 5 245K
On the CPU side: the Core Ultra 5 245K rates 82/100 for gaming in this model and brings 14 cores and 14 threads. At lower resolutions it's the one setting the pace for the whole system.
[GPU] RX 7800 XT
The RX 7800 XT (45/100 on the model's gaming scale) supplies the raster muscle of the build. Its 16 GB of GDDR6 set how far it can go on resolution and texture quality before video memory runs short.
Beyond the FPS: Both parts come from nearby generations, which usually means a natural pairing with no platform surprises. You're combining an Intel platform with an AMD GPU — a perfectly valid mix that imposes no penalty.
WHAT TO CHANGE, AND WHAT IT COSTS
At 1440p the RX 7800 XT sets the frame rate, and the Core Ultra 5 245K can drive a faster card. The cheapest card that clears our bar for a recommendation (at least 25% more frames) is the NVIDIA RTX 4080: about 26% more in this model, with this processor and 16 GB. This processor keeps up with cards up to the NVIDIA RTX 5080; anything between the two is an upgrade that gets used, and beyond that card the processor becomes the limit.
The gain is the model's estimate at 2560x1440 with 16 GB, not a measurement of your PC, and prices change: check them at the retailer before deciding.
PRICE OF THIS PAGE'S PAIRING
Affiliate links — we earn a small commission at no cost to you. Full disclosure
SPECIFICATIONS
CATALOGUE DATA[CPU] Intel Core Ultra 5 245K
- Cores14C / 14T
- Clock4.2 – 5.2 GHz
- TDP125 W
- SocketLGA1851
- Single-thread4,600
- Multi-thread38,115
- L3 cache24 MB
[GPU] AMD RX 7800 XT
- VRAM16 GB GDDR6
- Memory bus256-bit
- TDP263 W
- G3D Mark29,014
- Memory bandwidth624.1 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour CPU (Core Ultra 5 245K) and GPU (RX 7800 XT) are an exceptionally balanced match for gaming at 1920x1080. No realistic component swap would meaningfully improve this build.
Your GPU (RX 7800 XT) is the limiting factor at 2560x1440. In graphically demanding titles you will see lower frame rates; a faster GPU would deliver a clear improvement.
Your GPU (RX 7800 XT) severely limits the system at 3440x1440 (Ultrawide 21:9), leaving the Core Ultra 5 245K heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RX 7800 XT) severely limits the system at 5120x1440 (Super Ultrawide 32:9), leaving the Core Ultra 5 245K heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RX 7800 XT) severely limits the system at 4K, leaving the Core Ultra 5 245K heavily underused. A faster GPU would improve performance dramatically.
ESTIMATED FPS BY GAME
1920x1080SYSTEM DIAGNOSTICS
POWER · VRAM & PCIe · RAMPOWER ESTIMATION
The Core Ultra 5 245K (125W) and RX 7800 XT (263W) add up to roughly 388W under load. Adding 150W for the rest of the system gives 538W, and with a 30% transient margin, 700W is the safe figure.
VIDEO MEMORY AND PCIe
The RX 7800 XT's memory bus (256-bit) and bandwidth (624.1 GB/s) describe its own video memory, meaning how fast the card reads its 16 GB of GDDR6, not the PCIe link to the processor. The PCIe link depends on the card, the processor and the motherboard slot together; our catalogue does not record PCIe generation or lane count, so the model does not estimate it. It matters most for cards with an eight-lane interface in older PCIe 3.0 boards: check the card's and the board's specifications.
SYSTEM MEMORY
This page assumes 16 GB in dual channel. At 1440p, the resolution recommended above, that meets the model's capacity target of 16 GB (enough for three in four of the games it covers), so more capacity would add little or nothing there. The target stays at 16 GB even at 4K, so a larger kit is for heavy multitasking or mods, not for these games. Memory speed and a second channel act on the processor's ceiling instead: they matter in the games the CPU limits, by an amount that depends on the game, and the calculator lets you enter your own kit.
HOW THIS PAGE IS CALCULATED
ENGINE v2026.08 · 2026-09-11CALCULATED, NOT WRITTEN
Every figure and every sentence comes from the same deterministic engine, driven by the catalogue specifications. That is what makes it reproducible: with the same engine version (2026.08) and the same catalogue, the same pairing always gives the same result. When either changes, the version and date above change with it, and the changelog says why.
WHERE THE DATA COMES FROM
Specifications come from the official AMD, Intel and NVIDIA datasheets together with PassMark and TechPowerUp. The gaming indices are calibrated against frame rates published by review outlets (TechPowerUp, TechSpot / Hardware Unboxed, Tom's Hardware, Gamers Nexus, Digital Foundry) rather than synthetic scores. That data is compiled, not measured here: this site runs no test bench of its own.
STATED LIMITS
Figures estimate native raster performance at high/ultra quality, with no ray tracing, upscaling or frame generation. We do not yet publish an externally validated error margin — the accuracy page states exactly where that stands.
* Affiliate disclosure: the Amazon links exist to show pricing. As an Amazon Associate we earn from qualifying purchases at no extra cost to you. Recommendation order is decided by the engine and does not depend on commission.
TRY WITH YOUR OWN HARDWARE
Customize RAM, resolution, and discover upgrade recommendations.
FREQUENTLY ASKED QUESTIONS
5Does the Intel Core Ultra 5 245K bottleneck the AMD RX 7800 XT?
At 1080p the two stay well balanced, whereas at 4K the RX 7800 XT is the limiting part (~48% GPU bottleneck). Overall, the GPU is the limit at high resolution, with 66% average efficiency across the 12 resolutions our model tests. The resolution we would target with this pair is 1440p, where AAA games average 66 FPS.
How many FPS do the Core Ultra 5 245K and RX 7800 XT get at 1080p?
At 1080p this combination averages about 92 FPS in AAA games and around 444 FPS in esports titles. In Valorant we estimate up to 757 FPS.
Is this pairing good for 4K gaming?
Playable rather than smooth: about 44 FPS on average in AAA titles at 4K, with the RX 7800 XT setting the limit. Upscaling (DLSS, FSR or XeSS) or lower settings are the usual way to reach 60 FPS.
What power supply do I need for the Core Ultra 5 245K and RX 7800 XT?
With an estimated combined draw of 388W across CPU and GPU, we recommend at least a 700W 80+ Gold supply (ideally ATX 3.0) to run with headroom.
Is the RX 7800 XT's 16 GB of VRAM enough?
In the model, 16 GB covers all 11 games it tracks even at 4K with high textures, so video memory is not the constraint for this pairing.