Buying Guide
The Best CPUs for the RTX 4080 and 4080 Super
Six high-end processors for an RTX 4080 or 4080 Super, compared on cache, cores and platform.
By The PC Journal editorial team
12 min read6 products evaluated
The RTX 4080 and 4080 Super are close in speed and share 16GB of memory, so this guide covers both. At 1440p they can outrun weaker processors, so cache and clock speed matter.
We compared six processors on cache, cores, rated power and platform, using manufacturer specifications.
Quick Picks
Our 6 recommendations at a glance. Tap a pick for the full verdict.
Best Match for an RTX 4080
AMD Ryzen 7 9800X3D
Eight Zen 5 cores with 96MB of L3.
Best for: 4K and high-refresh 1440p builds.
Our take Check price for AMD Ryzen 7 9800X3D (opens in a new tab)
Best Value X3D
AMD Ryzen 7 7800X3D
96MB of L3 on eight cores for less than the 9800X3D at the time of writing.
Best for: Saving money for the card.
Our take Check price for AMD Ryzen 7 7800X3D (opens in a new tab)
Largest Game Cache
AMD Ryzen 9 9950X3D
The largest L3 cache here (128MB).
Best for: Games that are limited by the CPU at high frame rates.
Our take Check price for AMD Ryzen 9 9950X3D (opens in a new tab)
Best LGA1700 Pairing
Intel Core i7-14700K
Twenty cores with DDR4 or DDR5 support.
Best for: Intel builds reusing memory.
Our take Check price for Intel Core i7-14700K (opens in a new tab)
Best LGA1851 Pairing
Intel Core Ultra 7 265K
Twenty cores on Intel's current platform.
Best for: New Intel builds.
Our take Check price for Intel Core Ultra 7 265K (opens in a new tab)
Best Twelve-Core Pick
AMD Ryzen 9 9900X
Twelve Zen 5 cores.
Best for: Heavy multitasking alongside games.
Our take Check price for AMD Ryzen 9 9900X (opens in a new tab)
Our Picks
Best Match for an RTX 40801 of 6
AMD Ryzen 7 9800X3D on Amazon (opens in a new tab)
The Ryzen 7 9800X3D pairs 96MB of L3 cache with eight Zen 5 cores.
Best for
- 4K and high-refresh 1440p builds.
Skip if
- Look at the others if this bothers you: no cooler in the box.
Why we like it
AMD moved the cache below the cores on this generation, which lets it clock higher than the 7800X3D. Its 5.2GHz boost clock ranks fifth of 6 here, behind the Ryzen 9 9950X3D (5.7GHz) and ahead of the Ryzen 7 7800X3D (5GHz). On core count it ties with the Ryzen 7 7800X3D at 8 cores.
On rated power it ties with the Ryzen 7 7800X3D and the Ryzen 9 9900X at 120W. It also offers an unlocked multiplier, a first for AMD's X3D chips. It needs an AM5 board (A620, B650, B850, X670 or X870 series) and DDR5 memory; a 600-series board may need a BIOS update first, so check the maker's CPU support list for the minimum version.
Budget for a dual-tower air cooler or a 240mm-plus AIO, since none is included. When we checked, only the Core i7-14700K and cheaper picks cost less, and the Ryzen 9 9950X3D cost more.
Key dimensions & specs
- L3 cache: 96MB
- Max boost: 5.2GHz
- Cores / threads: 8 cores
- Rated power: 120W
- Threads: 16
- Socket: AM5
- Memory: DDR5
- Cooler in box: No
- Integrated graphics: Yes
Pros
- 96MB of L3 cache from 3D V-Cache
- Integrated graphics for display output without a graphics card
- Second-generation 3D V-Cache placed under the cores
- Unlocked multiplier, a first for AMD's X3D chips
Cons
- No cooler in the box
- Costs more than the Ryzen 9 9900X at the time of writing
Best Value X3D2 of 6
AMD Ryzen 7 7800X3D on Amazon (opens in a new tab)
The Ryzen 7 7800X3D was the first eight-core AM5 chip with 3D V-Cache.
Best for
- Saving money for the card.
Skip if
- Worth skipping when no cooler in the bo is a problem.
Why we like it
It carries the same 96MB of L3 as the 9800X3D at a lower boost clock and a lower price. On boost clock it trails the group at 5GHz, while the Ryzen 9 9950X3D offers 5.7GHz. It matches the Ryzen 7 9800X3D on core count (8 cores).
It matches the Ryzen 7 9800X3D and the Ryzen 9 9900X on rated power (120W). It also comes with the Zen 4 architecture. It needs an AM5 board (A620, B650, B850, X670 or X870 series) and DDR5 memory; check the board's CPU support list for the minimum BIOS version.
Budget for a dual-tower air cooler or a 240mm-plus AIO, since none is included. Its price falls between the Ryzen 9 9900X and the Core Ultra 7 265K, based on our last check.
Key dimensions & specs
- L3 cache: 96MB
- Max boost: 5GHz
- Cores / threads: 8 cores
- Rated power: 120W
- Threads: 16
- Socket: AM5
- Memory: DDR5
- Cooler in box: No
- Integrated graphics: Yes
Pros
- 96MB of L3 cache from 3D V-Cache
- Integrated graphics for display output without a graphics card
- First-generation AM5 3D V-Cache
- The Zen 4 architecture
Cons
- No cooler in the box
- Boost clock trails the Ryzen 9 9950X3D (5.7GHz)
- Core count trails the Core i7-14700K (20 cores)
Largest Game Cache3 of 6
AMD Ryzen 9 9950X3D on Amazon (opens in a new tab)
The Ryzen 9 9950X3D combines sixteen cores with 128MB of L3 cache.
Best for
- Games that are limited by the CPU at high frame rates.
Skip if
- Worth skipping when 170W rating calls for a large air cooler or a 280mm-plus AI is a problem.
Why we like it
It is the chip for players who also render, compile or encode on the same machine. On L3 cache it leads this guide at 128MB, ahead of the Ryzen 7 9800X3D (96MB). Nothing else here matches its 5.7GHz boost clock; the Core i7-14700K comes closest at 5.6GHz.
Its 16 cores core count ranks third of 6 here, behind the Core i7-14700K (20 cores) and ahead of the Ryzen 7 7800X3D (8 cores). Its 170W rated power is the highest in this group; the Ryzen 7 9800X3D leads at 120W. It also offers 3D V-Cache on one of its two core dies and a design aimed at both games and content creation. It was the highest-priced of the 6 picks at the time of writing, so the case for it rests on what it adds over the Ryzen 7 9800X3D and the rest.
Key dimensions & specs
- L3 cache: 128MB
- Max boost: 5.7GHz
- Cores / threads: 16 cores
- Rated power: 170W
- Threads: 32
- Socket: AM5
- Memory: DDR5
- Cooler in box: No
- Integrated graphics: Yes
Pros
- 128MB of L3 cache from 3D V-Cache
- 5.7GHz maximum boost
- 16 cores for encoding and background work
- Integrated graphics for display output without a graphics card
Cons
- 170W rating calls for a large air cooler or a 280mm-plus AIO
- No cooler in the box
- Rated power trails the Ryzen 7 9800X3D (120W)
Best LGA1700 Pairing4 of 6
Intel Core i7-14700K on Amazon (opens in a new tab)
The Core i7-14700K has twenty cores on LGA1700 and supports DDR4 or DDR5.
Best for
- Intel builds reusing memory.
Skip if
- Worth skipping when no cooler in the bo is a problem.
Why we like it
It needs strong cooling to hold its boost clocks. Its 33MB L3 cache ranks fifth of 6 here, behind the Ryzen 9 9950X3D (128MB) and ahead of the Core Ultra 7 265K (30MB). It matches the Ryzen 9 9900X on boost clock (5.6GHz).
On core count it ties with the Core Ultra 7 265K at 20 cores. It is the only pick here with an LGA1700 socket; the Core Ultra 7 265K has an LGA1851 socket instead. No other pick in this guide offers DDR4 or DDR5 memory; compare the Ryzen 7 9800X3D, which has DDR5 memory.
It also offers 8 performance and 12 efficient cores and support for both DDR4 and DDR5 boards. When we checked, only the Core Ultra 7 265K and cheaper picks cost less, and the Ryzen 7 9800X3D cost more.
Key dimensions & specs
- L3 cache: 33MB
- Max boost: 5.6GHz
- Cores / threads: 20 cores
- Rated power: 125W
- Threads: 28
- Socket: LGA1700
- Memory: DDR4 or DDR5
- Cooler in box: No
- Integrated graphics: Yes
Pros
- 5.6GHz maximum boost
- 20 cores for encoding and background work
- Integrated graphics for display output without a graphics card
- 8 performance and 12 efficient cores
Cons
- No cooler in the box
- Costs more than the Ryzen 9 9900X at the time of writing
Best LGA1851 Pairing5 of 6
Intel Core Ultra 7 265K on Amazon (opens in a new tab)
The Core Ultra 7 265K uses Intel's LGA1851 platform with twenty cores.
Best for
- New Intel builds.
Skip if
- Look at the others if this bothers you: no cooler in the box.
Why we like it
It is strong in multi-threaded work and supports only DDR5. Its 30MB L3 cache is the smallest in this group; the Ryzen 9 9950X3D leads at 128MB. Its 5.5GHz boost clock ranks fourth of 6 here, behind the Ryzen 9 9950X3D (5.7GHz) and ahead of the Ryzen 7 7800X3D (5GHz).
On core count it ties with the Core i7-14700K at 20 cores. On rated power it ties with the Core i7-14700K at 125W. It is the only pick here with an LGA1851 socket; the Ryzen 7 9800X3D has an AM5 socket instead.
It also offers 8 performance and 12 efficient cores and a built-in NPU for AI features. It needs an LGA1851 board (Intel 800-series chipset) and DDR5 memory; LGA1700 boards and coolers without an LGA1851 mounting kit will not fit. When we checked, only the Ryzen 7 7800X3D and cheaper picks cost less, and the Core i7-14700K cost more.
Key dimensions & specs
- L3 cache: 30MB
- Max boost: 5.5GHz
- Cores / threads: 20 cores
- Rated power: 125W
- Threads: 20
- Socket: LGA1851
- Memory: DDR5
- Cooler in box: No
- Integrated graphics: Yes
Pros
- 5.5GHz maximum boost
- 20 cores for encoding and background work
- Integrated graphics for display output without a graphics card
- 8 performance and 12 efficient cores
Cons
- No cooler in the box
- L3 cache trails the Ryzen 9 9950X3D (128MB)
- Costs more than the Ryzen 9 9900X at the time of writing
Best Twelve-Core Pick6 of 6
AMD Ryzen 9 9900X on Amazon (opens in a new tab)
The Ryzen 9 9900X has twelve Zen 5 cores for work that scales with threads.
Best for
- Heavy multitasking alongside games.
Skip if
- Worth skipping when no cooler in the bo is a problem.
Why we like it
For games alone, the eight-core X3D chips are the better buy. On L3 cache it sits mid-pack at 64MB: the Ryzen 9 9950X3D offers 128MB, and the Core Ultra 7 265K comes in at 30MB. On boost clock it ties with the Core i7-14700K at 5.6GHz.
Its 12 cores core count ranks fourth of 6 here, behind the Core i7-14700K (20 cores) and ahead of the Ryzen 7 7800X3D (8 cores). It matches the Ryzen 7 9800X3D and the Ryzen 7 7800X3D on rated power (120W). You also get the Zen 5 architecture.
It needs an AM5 board (A620, B650, B850, X670 or X870 series) and DDR5 memory; a 600-series board may need a BIOS update first, so check the maker's CPU support list for the minimum version. It was the cheapest of the group when we checked; the Ryzen 7 7800X3D was the next step up.
Key dimensions & specs
- L3 cache: 64MB
- Max boost: 5.6GHz
- Cores / threads: 12 cores
- Rated power: 120W
- Threads: 24
- Socket: AM5
- Memory: DDR5
- Cooler in box: No
- Integrated graphics: Yes
Pros
- 64MB of L3 cache
- 5.6GHz maximum boost
- 12 cores for encoding and background work
- Integrated graphics for display output without a graphics card
Cons
- No cooler in the box
- L3 cache of 64MB, behind the Ryzen 9 9950X3D (128MB)
How We Chose
Each pick was assessed across 4 criteria weighted for real-world use.
- Upgrade path
- We considered how long each socket is likely to receive new CPUs.
- Platform cost
- We noted socket, memory type and whether a cooler is included, since they change the real price.
- Power and cooling
- We recorded each chip's rated power and what cooler class it needs.
- Game-relevant specs
- We compared L3 cache, boost clocks and core counts from AMD's and Intel's product pages.
What to Look for in a CPUs for RTX 4080
Key buying criteria so you get the right fit the first time.
Match the CPU to your graphics card and monitor
At 1440p and 4K the graphics card sets most frame rates, so a mid-range CPU is often enough. At 1080p with a high-refresh monitor, the CPU matters much more.
Spend on the part that limits your games, not on the bigger number.
Cache helps games more than clocks
AMD's X3D chips add a large stacked L3 cache that keeps more game data close to the cores. In CPU-limited games that often helps more than a higher boost clock.
The gain shrinks when the graphics card is the limit.
Cores matter for streaming and creation
Six and eight cores cover gaming. Streaming with CPU encoding, video editing and compiling benefit from twelve or sixteen.
If you encode on the graphics card instead, core count matters less.
The socket decides your upgrade path
The socket fixes which motherboards and future CPUs you can use. AM5 has had several CPU generations; AM4 has no newer chips coming.
If you plan to upgrade later, a current platform is worth a small premium.
Check BIOS support before buying
Newer CPUs on older boards may need a BIOS update before the system will start. Check the board's CPU support list for the version you need and whether the board can flash without a CPU installed.
Budget for the cooler
Most unlocked chips ship without a cooler. A 65W part runs well on a basic single tower, while 120W to 170W parts need a dual tower or an AIO to hold their boost clocks.
Add the cooler to the CPU price when comparing.
How to Choose a CPUs for RTX 4080
By priority
| Priority | Consider | Why |
|---|---|---|
| 4K and high-refresh 1440p builds | Ryzen 7 9800X3D | Eight Zen 5 cores with 96MB of L3 |
| Saving money for the card | Ryzen 7 7800X3D | 96MB of L3 on eight cores for less than the 9800X3D at the time of writing |
| Games that are limited by the CPU at high frame rates | Ryzen 9 9950X3D | The largest L3 cache here (128MB) |
| Intel builds reusing memory | Core i7-14700K | Twenty cores with DDR4 or DDR5 support |
| New Intel builds | Core Ultra 7 265K | Twenty cores on Intel's current platform |
| Heavy multitasking alongside games | Ryzen 9 9900X | Twelve Zen 5 cores |
Scroll sideways to see every column.
Key specs side by side
Figures as each maker states them.
| Processor | L3 cache | Max boost | Cores / threads | Rated power |
|---|---|---|---|---|
| Ryzen 7 9800X3D | 96MB | 5.2GHz | 8 cores | 120W |
| Ryzen 7 7800X3D | 96MB | 5GHz | 8 cores | 120W |
| Ryzen 9 9950X3D | 128MB | 5.7GHz | 16 cores | 170W |
| Core i7-14700K | 33MB | 5.6GHz | 20 cores | 125W |
| Core Ultra 7 265K | 30MB | 5.5GHz | 20 cores | 125W |
| Ryzen 9 9900X | 64MB | 5.6GHz | 12 cores | 120W |
Scroll sideways to see every column.
By price at the time of writing
Prices change often; these tiers reflect Amazon prices when this guide was updated.
| Price tier | Processors |
|---|---|
| About $250 to $500 | Ryzen 9 9900X, Ryzen 7 7800X3D, Core Ultra 7 265K, Core i7-14700K, Ryzen 7 9800X3D |
| About $500 to $1000 | Ryzen 9 9950X3D |
Frequently Asked Questions
What does the rated power figure mean?
It is AMD's default TDP or Intel's base power. Chips can draw more under boost, so size the cooler for sustained loads, not the label alone.
What memory should I pair with it?
AM5 and LGA1851 use DDR5; AM4 uses DDR4. For AM5, a 32GB DDR5-6000 kit is a common pairing; check the board's memory support list.
What does X3D mean on a Ryzen CPU?
It marks AMD's 3D V-Cache chips, which stack extra L3 cache on the processor. Games that are limited by the CPU tend to run faster on them.
Do I need to buy a separate cooler?
Usually yes. Only some chips, such as the Ryzen 5 7600 and 5600X, include a basic cooler; unlocked high-end models do not.
Is AM4 still worth buying into?
For an upgrade to an existing AM4 system, yes. For a new build, AM5 or LGA1851 gives a longer upgrade path.
Should I choose Intel or AMD for gaming?
At the high end, AMD's X3D chips lead in many CPU-limited games. Intel's Core Ultra chips offer more cores for work at similar prices. Choose by workload and platform cost.
Bottom Line
The Ryzen 7 9800X3D is the best CPU for an RTX 4080 or 4080 Super. The 7800X3D is the value pick, the 9950X3D and 9900X suit creators, and the i7-14700K or Core Ultra 7 265K cover Intel.