Quick picks
RTX 5090: Ryzen 7 9800X3D or 9850X3D. The only CPUs that are balanced with the card at 1440p. At 1080p even these leave about 30% of the GPU unused.
RTX 5080: Ryzen 7 9800X3D for 1080p high refresh, Ryzen 5 7600 or better for 1440p. Every CPU in our table is balanced or GPU-limited with a 5080 at 1440p.
4K only, either card: the CPU barely matters at native 4K. A Ryzen 5 7600 lands within 4% of a 9800X3D with the 5090. Turn on DLSS, though, and the gap opens again.
Intel: Core i7-14700K, i9-14900K or Core Ultra 9 285K. Fine for a 5080 at 1440p and a 5090 at 4K, about 20% CPU-limited with a 5090 at 1440p.
AM4 owners: a Ryzen 7 5700X3D or 5800X3D is balanced with a 5080 at 1440p and fine with a 5090 at 4K.
How fast are the RTX 5090 and RTX 5080?
In our GPU index (RTX 4090 = 100) the RTX 5090 scores 124 and the RTX 5080 88. That makes the 5090 about 41% faster than the 5080 and 24% faster than a 4090, while the 4090 stays about 14% ahead of the 5080. The memory gap is just as wide: 32 GB on the 5090 against 16 GB on the 5080. Our RTX 5090 vs RTX 5080 and RTX 5080 vs RTX 4090 pages cover the cards head to head.
For CPU pairing, what matters is how many frames each card can draw. At 1080p High the 5090 can render about 285 FPS in AAA games, but the fastest CPU in our database, the Ryzen 7 9850X3D, prepares only about 206. No processor you can buy closes that gap, so at 1080p a 5090 is always CPU-limited. That's not a fault in your build: the card was made for 4K.
Prices put these cards in their own tier. The RTX 5090 launched at $1,999 and the RTX 5080 at $999 (US MSRPs), and street prices have often run higher. Next to that, the price difference between a mid-range CPU and a top X3D chip is small, which is why we'd rarely pair either card with a budget processor.
CPUs with the RTX 5090: FPS and bottleneck
Average FPS in AAA games at High settings without upscaling, with the bottleneck below each figure. Click a number to open that build in the calculator, or a CPU name for its build page.
| CPU | 1080p | 1440p | 4K |
|---|---|---|---|
| Ryzen 7 5700X3D | 132 CPU 54% | 131 CPU 34% | 115 Balanced |
| Ryzen 7 5800X3D | 140 CPU 51% | 139 CPU 30% | 117 GPU 14% |
| Ryzen 5 7600 | 136 CPU 52% | 135 CPU 32% | 116 GPU 11% |
| Ryzen 7 9700X | 154 CPU 46% | 152 CPU 23% | 119 GPU 22% |
| Core i5-14600K | 150 CPU 47% | 148 CPU 25% | 118 GPU 20% |
| Core i7-14700K | 158 CPU 45% | 155 CPU 21% | 119 GPU 24% |
| Core i9-14900K | 160 CPU 44% | 157 CPU 20% | 119 GPU 25% |
| Core Ultra 7 265K | 150 CPU 47% | 148 CPU 25% | 118 GPU 20% |
| Core Ultra 9 285K | 154 CPU 46% | 152 CPU 23% | 119 GPU 22% |
| Ryzen 7 7800X3D | 176 CPU 38% | 169 CPU 12% | 120 GPU 31% |
| Ryzen 7 9800X3D | 199 CPU 30% | 183 Balanced | 120 GPU 40% |
| Ryzen 7 9850X3D | 204 CPU 28% | 186 Balanced | 120 GPU 41% |
At 1080p every CPU holds the 5090 back, from 28% on the Ryzen 7 9850X3D to 52% on the Ryzen 5 7600. The CPU still decides your frame rate, which is why the Ryzen 7 9800X3D runs about 46% faster than the 7600 here.
At 1440p only the Ryzen 7 9800X3D and Ryzen 7 9850X3D are balanced. The Ryzen 7 7800X3D is 12% CPU-limited, a minor bottleneck. Every non-X3D chip is at least 20% CPU-limited, including the Core i9-14900K. The Ryzen 9 9950X3D games like a 9800X3D (about 182 FPS here), so only buy it if you also need 16 cores for work.
At 4K every CPU in the table is balanced or GPU-limited, and the spread from slowest to fastest is just 115–120 FPS. Even a Ryzen 5 5600 is only 12% CPU-limited. If you play only at native 4K, a mid-range CPU is a reasonable choice, but keep reading before you decide, because upscaling changes this.
CPUs with the RTX 5080: FPS and bottleneck
Same settings, with the 5080:
| CPU | 1080p | 1440p | 4K |
|---|---|---|---|
| Ryzen 7 5700X3D | 131 CPU 35% | 125 Balanced | 85 GPU 35% |
| Ryzen 7 5800X3D | 139 CPU 31% | 129 Balanced | 85 GPU 39% |
| Ryzen 5 7600 | 135 CPU 33% | 127 Balanced | 85 GPU 37% |
| Ryzen 7 9700X | 152 CPU 24% | 134 Balanced | 86 GPU 44% |
| Core i5-14600K | 148 CPU 26% | 133 Balanced | 86 GPU 43% |
| Core i7-14700K | 155 CPU 22% | 135 GPU 10% | 86 GPU 46% |
| Core i9-14900K | 157 CPU 21% | 136 GPU 12% | 86 GPU 46% |
| Core Ultra 7 265K | 148 CPU 26% | 133 Balanced | 86 GPU 43% |
| Core Ultra 9 285K | 152 CPU 24% | 134 Balanced | 86 GPU 44% |
| Ryzen 7 7800X3D | 170 CPU 13% | 139 GPU 20% | 86 GPU 51% |
| Ryzen 7 9800X3D | 184 Balanced | 140 GPU 29% | 86 GPU 57% |
| Ryzen 7 9850X3D | 187 Balanced | 141 GPU 31% | 86 GPU 58% |
The 5080 is much easier to pair. At 1440p every CPU in the table is balanced or GPU-limited, from the Ryzen 7 5700X3D up. A Ryzen 5 7600 + RTX 5080 runs at about 127 FPS against 140 with a 9800X3D, so the expensive CPU buys you very little at this resolution.
At 1080p it's the opposite. Every non-X3D chip is at least 21% CPU-limited, the Ryzen 7 7800X3D is 13% CPU-limited, and only the 9800X3D and 9850X3D use the whole card. If you bought a 5080 for a 1080p 360 Hz monitor, that's the pairing to get. At 4K every CPU lands near 85 FPS.
Ray tracing, DLSS and frame generation shift the load
The tables above use native resolution. Most people with these cards play with DLSS on, and that matters for the CPU. Upscaling renders each frame at a lower internal resolution, so the GPU finishes faster and the CPU has to prepare more frames per second. Here's the RTX 5090 with a Ryzen 5 7600 and a Ryzen 7 9800X3D:
| RTX 5090, AAA at High | 7600, 4K | 9800X3D, 4K | 7600, 1440p | 9800X3D, 1440p |
|---|---|---|---|---|
| Native, no upscaling | 116 GPU 11% | 120 GPU 40% | 135 CPU 32% | 183 Balanced |
| DLSS Quality | 133 CPU 19% | 164 GPU 16% | 136 CPU 51% | 198 CPU 28% |
| DLSS Performance | 136 CPU 39% | 192 CPU 10% | 136 CPU 63% | 200 CPU 46% |
| Ray tracing, native | 70 GPU 39% | 70 GPU 59% | 106 Balanced | 115 GPU 32% |
| Ray tracing + DLSS Performance | 111 CPU 11% | 128 GPU 24% | 115 CPU 46% | 167 CPU 21% |
At native 4K the two CPUs are nearly tied. With DLSS Performance at 4K, the 7600 becomes 39% CPU-limited and the 9800X3D is about 41% faster. That's the main reason to buy a top CPU for a 4K 5090 build: upscaling turns a GPU-bound 4K setup into something closer to 1080p for the processor.
Ray tracing works in two directions. It adds CPU work (building the scene structures the rays are traced against), which lowers the CPU's frame-rate ceiling by about 15% in our model. But it costs the GPU far more, so native ray tracing is GPU-bound: at 4K both CPUs land on about 70 FPS, and even at 1440p the 7600 becomes balanced. Add DLSS on top, which is how ray tracing is usually played, and the CPU is the limit again: at 1440p with ray tracing and DLSS Performance both CPUs are CPU-limited, at 115 and 167 FPS.
DLSS 4 Multi Frame Generation, which needs an RTX 50 card, inserts generated frames between the ones your PC renders. It raises the number on the counter even when the CPU is the limit, but input still responds at the rendered rate. A faster CPU raises that base rate, so it still matters with frame generation on. Our DLSS vs FSR vs XeSS guide explains the modes.
Esports, simulators and strategy games
Competitive games at low settings put almost all the work on the CPU. With a 5090 at 1080p, CS2-style esports titles run at about 519 FPS on the 9800X3D and 535 on the 9850X3D, the only two in the table that clear 480 Hz. The Ryzen 7 7800X3D manages 457, the Core i7-14700K 411, and the Ryzen 5 7600 354, just short of 360 Hz. Use the FPS calculator for numbers in specific games.
Simulators, strategy games and MMOs are CPU-limited even at 4K with a 5090. On every CPU in our table, this game type is held back by the processor, with about 75 FPS on the 7600 and 109 on the 9800X3D. If you play Flight Simulator, city builders or late-game strategy titles, the CPU is the part to prioritize, whatever your resolution.
The best CPU for each platform
AM5: Ryzen 7 9800X3D, or the 9850X3D
The 9800X3D (launch price $479) is the pairing we'd pick for either card. The Ryzen 7 9850X3D (launch price $499) is a higher-clocked version, about 3% faster in our CPU index, which shows only where the CPU is the limit: 1080p, esports and upscaled 4K with a 5090. See 9850X3D vs 9800X3D for the full comparison. If you already own a 7800X3D, our 9800X3D vs 7800X3D guide shows when the upgrade pays off. With a 5080 at 1440p, or a 5090 at native 4K, the 7800X3D is fine as it is.
Intel 14th gen and Core Ultra
The Core i7-14700K, Core i9-14900K and Core Ultra 9 285K are all strong pairings for a 5080 at 1440p (the 14700K is 10% GPU-limited there) and for a 5090 at 4K. With a 5090 at 1440p they fall behind the X3D chips: the 285K is 23% CPU-limited. Compare 9800X3D vs i9-14900K and 9800X3D vs Ultra 9 285K. If you use a 13th or 14th-gen chip, install the latest BIOS with Intel's stability microcode first. Our LGA1700 upgrade guide covers that platform in detail.
AM4 owners: Ryzen 7 5700X3D or 5800X3D
With an RTX 5080 at 1440p the 5700X3D is balanced, so an AM4 X3D chip is a sensible way to add a 5080 without a new platform. With a 5090 they work at 4K, but they're 34% and 30% CPU-limited at 1440p, which is a lot of an expensive card going unused. For a 5090, plan a move to AM5. Our best AM4 CPU guide covers the drop-in options.
Power supply, the 12V-2x6 connector and PCIe
Power supply. NVIDIA rates the RTX 5090 at 575 W and recommends a 1000 W power supply, and the 5080 at 360 W with an 850 W recommendation. Those figures assume a typical CPU. An X3D chip draws far less than a Core i9 under gaming load, which gives you some margin, but don't go below the recommendation on a 5090. A quality ATX 3.1 unit with a native 12V-2x6 cable is the cleanest option.
The 12V-2x6 connector. Both cards take power through a single 16-pin connector. Push it in until it's fully seated with no gap, avoid bending the cable sharply right at the plug, and use either the PSU's native cable or the adapter that came with the card. Don't stack extra adapters or extensions. Check the connector again after moving the PC.
PCIe. Both cards are PCIe 5.0 x16. On a PCIe 4.0 board the difference is negligible. On PCIe 3.0 the loss is larger but still usually small, and a board that old usually comes with a CPU that holds these cards back far more than the slot does.
If a 5080 or 5090 is more than you need, our 7800X3D + RTX 5070 Ti guide looks at the step down.
Frequently asked questions
What is the best CPU for an RTX 5090?
The Ryzen 7 9800X3D or 9850X3D. They're the only CPUs balanced with a 5090 at 1440p, and they keep the most frames when DLSS shifts the load to the CPU. At 1080p even these hold the card back by about 30%.
Will a Ryzen 7 7800X3D bottleneck an RTX 5090?
Slightly at 1440p, where it's 12% CPU-limited, and clearly at 1080p (38%). At native 4K it's GPU-limited and runs at about 120 FPS, close to a 9800X3D.
Does the CPU matter for an RTX 5090 at 4K?
At native 4K, hardly: every CPU from the Ryzen 5 7600 up lands within a few FPS. With DLSS Performance it matters a lot. The 7600 becomes 39% CPU-limited and the 9800X3D runs about 41% faster.
What CPU do I need for an RTX 5080?
For 1440p, a Ryzen 5 7600, Ryzen 7 5700X3D, Core i5-14600K or anything faster is balanced with the card. For 1080p high refresh, choose a Ryzen 7 9800X3D or 9850X3D. They're the only CPUs that keep a 5080 fully busy at 1080p.
Is an Intel Core i9-14900K good for an RTX 5090?
It's good at 4K, where the card is the limit. At 1440p it's 20% CPU-limited with a 5090, and at 1080p 44%. A Ryzen 7 9800X3D is the better match for this card.
What power supply do I need for an RTX 5090 or 5080?
NVIDIA recommends a 1000 W power supply for the RTX 5090 and 850 W for the RTX 5080. Choose a quality ATX 3.1 unit with a native 12V-2x6 cable, and make sure the connector is fully seated.