Is NVIDIA GeForce RTX 4090 compatible with Intel Core i5-8400?

Yes, if your motherboard supports the LGA1151 socket. Recommended PSU: 700W.

What FPS can I get with NVIDIA GeForce RTX 4090 and Intel Core i5-8400?

FPS varies by game and preset. See the detailed per-game table above.

DESKTOP

NVIDIA GeForce RTX 4090 + Intel Core i5-8400

Q: Does the Intel Core i5-8400 bottleneck the NVIDIA GeForce RTX 4090?

At 1080p, the estimated bottleneck is 60%.

Bottleneck Analysis & Gaming FPS Estimates

Severe CPU Bottleneck

Significant bottleneck (~60%). Upgrading the CPU is strongly recommended.

Bottleneck at a Glance

60%

1080p Bottleneck

CPU

60%

1440p Bottleneck

CPU

60%

4K Bottleneck

CPU

Component Specs

24GB

GPU VRAM

450W

GPU TDP

6C/6T

CPU Cores

LGA1151

Socket

🛒 Check NVIDIA GeForce RTX 4090 Price 🛒 Check Intel Core i5-8400 Price

Estimated FPS in Popular Games (1080p)

Game	Low	High	Ultra	Genre
Grand Theft Auto VI (GTA 6)	163	113	80	Open World
Cyberpunk 2077	240	167	117	Action Rpg
Counter-Strike 2 (CS2)	610	421	301	Fps Shooter
Valorant	769	530	381	Fps Shooter
Grand Theft Auto V (GTA 5)	424	293	211	Open World
Red Dead Redemption 2	306	212	153	Open World
Fortnite	486	335	240	Battle Royale
Call of Duty: Warzone	337	234	166	Battle Royale
Call of Duty: Black Ops 6	339	235	167	Fps Shooter
Apex Legends	586	405	291	Battle Royale
Minecraft (with Shaders)	301	208	149	Sandbox
League of Legends (LoL)	832	574	412	Moba
Dota 2	533	368	264	Moba
PUBG: Battlegrounds	427	295	211	Battle Royale
Overwatch 2	694	478	343	Fps Shooter
Rainbow Six Siege	767	529	380	Fps Shooter
Rust	240	166	119	Survival
Escape from Tarkov	198	137	98	Survival Fps
Hogwarts Legacy	262	181	130	Action Rpg
Elden Ring	317	220	157	Action Rpg
Baldur's Gate 3	270	187	134	Rpg
Starfield	193	134	95	Action Rpg
Helldivers 2	276	191	137	Co Op Shooter
Black Myth: Wukong	238	166	119	Action Rpg
Alan Wake 2	216	150	106	Survival Horror
Palworld	301	208	148	Survival
EA Sports FC 25	502	347	250	Sports
Forza Horizon 5	394	272	194	Racing
The Witcher 3 (Next-Gen)	302	208	149	Action Rpg
Marvel's Spider-Man 2	261	180	129	Action Adventure

Upgrade Recommendations

Current: Intel Core i5-8400

⬆ Intel Core i7-9700K

+49.0% performance gain

Your Intel Core i5-8400 limits the NVIDIA GeForce RTX 4090 by ~60%. Upgrading to Intel Core i7-9700K unlocks ~49.0% more CPU performance on the same socket.

View New Combo Check Price on Amazon

Compatibility & Power

⚡Recommended PSU: 700W (80+ Bronze or better)

🔌CPU Socket: LGA1151 — verify your motherboard compatibility.

⚠️9th Gen Intel CPUs on 300-series motherboards may require a BIOS update.

🎮VRAM: 24GB GDDR — check per-game requirements in the FPS table.

🔋GPU Power Draw: 450W — CPU: 65W

FAQ

Does the Intel Core i5-8400 bottleneck the NVIDIA GeForce RTX 4090?

At 1080p, the estimated bottleneck is 60% (CPU).

What PSU do I need?

A quality 700W 80+ Bronze PSU is recommended.

Can I upgrade the CPU without changing my motherboard?

Yes — as long as you stay on the LGA1151 socket.