Core i5-12600K with RTX 4090: Bottleneck & FPS

The Core i5-12600K and RTX 4090 pair well, with the graphics card setting the pace at 4K: about 96 FPS on average in AAA games at High settings, with 1% lows around 75 FPS. At 1080p and 1440p the Core i5-12600K becomes the limit (44% CPU bottleneck at 1080p); from UW 1440p upward the RTX 4090 takes over and the CPU has capacity to spare. In esports titles such as CS2 or Valorant expect around 294 FPS, enough for a 240 Hz monitor, while CPU-heavy games like Microsoft Flight Simulator drop to about 70 FPS with a 42% CPU bottleneck. With ray tracing enabled, expect about 56 FPS at 4K, so turn on DLSS or FSR to get back above 60.

Processor

Intel Core i5-12600K

10 cores / 16 threads · LGA1700 · 2021

Graphics card

NVIDIA GeForce RTX 4090

24 GB VRAM · Ray tracing ✓ · 2022

4K (3840×2160) · High · AAA games · Native · 32 GB · 165 Hz

Change settings

GPU-limited

GPU-limited, CPU has headroom at 4K

The RTX 4090 is the limiting part at 4K, which is the normal and preferred situation for gaming. The Core i5-12600K has headroom for about 128 FPS, so it can handle a faster GPU later.

CPU128 FPSBottleneck

GPU97 FPSBottleneck

Display165 Hz

Max frames each part can deliver. Frames pile up in front of the slower one.

Avg FPS96

1% low75

CPU load75%

GPU load99%

Bottleneck by resolution

Core i5-12600K + RTX 4090 at High settings in AAA games.

Resolution	Avg FPS	1% low	Bottleneck
1080p (1920×1080)	128	89	CPU 44%
1440p (2560×1440)	126	88	CPU 20%
UW 1440p (3440×1440)	120	88	Balanced
4K (3840×2160)	96	75	GPU 24%

FPS by game type

At 4K, High settings.

Game type	Avg FPS	Limited by
AAA / mixed games Cyberpunk 2077, Black Myth: Wukong, Elden Ring	96	GPU 24%
Competitive esports CS2, Valorant, Fortnite (Performance), League of Legends	294	Balanced
CPU-heavy (strategy, sims, MMO) MS Flight Simulator, Cities: Skylines II, WoW, Baldur's Gate 3 Act 3	70	CPU 42%
Ray tracing / path tracing Cyberpunk RT Overdrive, Alan Wake 2, Indiana Jones	56	GPU 48%

Recommendations

Specific to these parts at 4K.

Your 165 Hz monitor can show more frames than this build delivers. Variable refresh (G-Sync/FreeSync) will keep motion smooth.

GPU upgrades for this CPU

The Core i5-12600K can drive a faster card at 4K.

Best match for your CPURTX 5090≈114 FPS (+18%) · balanced

Browse all 577 popular builds or open this build in the bottleneck calculator to try other settings.

Core i5-12600K + RTX 4090: quick answers

Does the Core i5-12600K bottleneck the RTX 4090?

1080p: 44% CPU-limited. 1440p: 20% CPU-limited. UW 1440p: balanced. 4K: 24% GPU-limited. At 4K the CPU keeps up, so this is a sensible pairing. A GPU-limited result is the normal, healthy state for gaming.

How many FPS does the Core i5-12600K with RTX 4090 get?

About 128 FPS at 1080p, 126 FPS at 1440p, 120 FPS at UW 1440p, 96 FPS at 4K in AAA games at High settings without upscaling. In esports games like CS2 and Valorant it reaches roughly 294 FPS at 4K.

What is the best upgrade for a Core i5-12600K + RTX 4090 build?

At 4K, the most effective upgrade is the RTX 5090. Use the calculator to check other resolutions and settings.