Buying Guide
The Best CPUs for the RX 7900 XTX
Six high-end processors for an RX 7900 XTX, compared on game cache, cores and platform.
By The PC Journal editorial team
12 min read6 products evaluated
The RX 7900 XTX is AMD's 24GB flagship of the RDNA 3 generation. At 1440p it can outrun many processors, so a chip with a large game cache matters.
We compared six processors on cache, cores, rated power and platform, using AMD and Intel specifications. We did not benchmark them.
Quick Picks
Our 6 recommendations at a glance. Tap a pick for the full verdict.
Best Match for an RX 7900 XTX
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)
Highest Boost Clock
AMD Ryzen 7 9850X3D
A 5.6GHz boost with 96MB of L3.
Best for: Players who want the fastest eight-core X3D.
Our take Check price for AMD Ryzen 7 9850X3D (opens in a new tab)
Best Value X3D
AMD Ryzen 7 7800X3D
96MB of L3 at a lower price than the Zen 5 X3D chips at the time of writing.
Best for: Keeping money for the monitor.
Our take Check price for AMD Ryzen 7 7800X3D (opens in a new tab)
Largest Game Cache
AMD Ryzen 9 9900X3D
The largest L3 cache here (128MB).
Best for: Players chasing 1% lows in simulation and esports titles.
Our take Check price for AMD Ryzen 9 9900X3D (opens in a new tab)
Best Intel Pairing
Intel Core i7-14700KF
Twenty cores on LGA1700 without integrated graphics.
Best for: Intel builds.
Our take Check price for Intel Core i7-14700KF (opens in a new tab)
Best Twelve-Core Value
AMD Ryzen 9 7900X
Twelve Zen 4 cores at a lower price than the 9900X3D at the time of writing.
Best for: Work-heavy builds that also game.
Our take Check price for AMD Ryzen 9 7900X (opens in a new tab)
Our Picks
Best Match for an RX 7900 XTX1 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
- Pass on it if no cooler in the bo rules it out for your setup.
Why we like it
AMD moved the cache below the cores on this generation, which lets it clock higher than the 7800X3D. On boost clock it sits mid-pack at 5.2GHz: the Ryzen 7 9850X3D offers 5.6GHz, and the Ryzen 7 7800X3D comes in at 5GHz. 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. Its price falls between the Ryzen 7 7800X3D and the Ryzen 7 9850X3D, based on our last check.
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 Core i7-14700KF at the time of writing
Highest Boost Clock2 of 6
AMD Ryzen 7 9850X3D on Amazon (opens in a new tab)
The Ryzen 7 9850X3D is a higher-clocked version of the 9800X3D: the same eight cores and 96MB of L3 with a higher boost ceiling.
Best for
- Players who want the fastest eight-core X3D.
Skip if
- Skip it if this is a deal-breaker for you: no cooler in the box.
Why we like it
It is AMD's second-generation X3D eight-core chip with 96MB of L3 cache. It matches the Core i7-14700KF and the Ryzen 9 7900X on boost clock (5.6GHz). On rated power it ties with the Ryzen 7 9800X3D, the Ryzen 7 7800X3D and the Ryzen 9 9900X3D at 120W.
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. Another plus is integrated graphics for display output without a graphics card.
Key dimensions & specs
- L3 cache: 96MB
- Max boost: 5.6GHz
- 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
- 5.6GHz maximum boost
- Integrated graphics for display output without a graphics card
- Higher-clocked take on the 9800X3D design
Cons
- No cooler in the box
- Costs more than the Core i7-14700KF at the time of writing
Best Value X3D3 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
- Keeping money for the monitor.
Skip if
- Look at the others if this bothers you: no cooler in the box.
Why we like it
It carries the same 96MB of L3 as the 9800X3D at a lower boost clock and a lower price. Its 5GHz boost clock is the lowest in this group; the Ryzen 7 9850X3D leads at 5.6GHz. On core count it ties with the Ryzen 7 9800X3D and the Ryzen 7 9850X3D at 8 cores.
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. When we checked, only the Ryzen 9 7900X and cheaper picks cost less, and the Ryzen 7 9800X3D cost more.
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 7 9850X3D (5.6GHz)
- Core count trails the Core i7-14700KF (20 cores)
Largest Game Cache4 of 6
AMD Ryzen 9 9900X3D on Amazon (opens in a new tab)
The Ryzen 9 9900X3D adds 3D V-Cache to a twelve-core layout.
Best for
- Players chasing 1% lows in simulation and esports titles.
Skip if
- Pass on it if no cooler in the bo rules it out for your setup.
Why we like it
It sits between the eight-core X3D chips and the 9950X3D on core count and price. Its 128MB L3 cache is the largest here; the Ryzen 7 9800X3D comes next at 96MB. Its 5.5GHz boost clock ranks fourth of 6 here, behind the Ryzen 7 9850X3D (5.6GHz) and ahead of the Ryzen 7 7800X3D (5GHz).
On core count it ties with the Ryzen 9 7900X at 12 cores. 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. Only the Ryzen 7 9850X3D came close to it on price at the time of writing; it cost the most of the 6 picks.
Key dimensions & specs
- L3 cache: 128MB
- Max boost: 5.5GHz
- Cores / threads: 12 cores
- Rated power: 120W
- Threads: 24
- Socket: AM5
- Memory: DDR5
- Cooler in box: No
- Integrated graphics: Yes
Pros
- 128MB of L3 cache from 3D V-Cache
- 5.5GHz maximum boost
- 12 cores for encoding and background work
- Integrated graphics for display output without a graphics card
Cons
- No cooler in the box
- Costs more than the Core i7-14700KF at the time of writing
Best Intel Pairing5 of 6
Intel Core i7-14700KF on Amazon (opens in a new tab)
The Core i7-14700KF is the 14700K without integrated graphics.
Best for
- Intel builds.
Skip if
- Choose another pick if you can't accept this: no cooler in the box.
Why we like it
It suits a gaming PC that already has a graphics card. On L3 cache it trails the group at 33MB, while the Ryzen 9 9900X3D offers 128MB. On boost clock it ties with the Ryzen 7 9850X3D and the Ryzen 9 7900X at 5.6GHz.
Nothing else here matches its 20 cores core count; the Ryzen 9 9900X3D comes closest at 12 cores. Its 125W rated power ranks fifth of 6 here, behind the Ryzen 7 9800X3D (120W) and ahead of the Ryzen 9 7900X (170W). An LGA1700 socket is unique to it among these picks, while the Ryzen 7 9800X3D uses an AM5 socket.
You get DDR4 or DDR5 memory here, which sets it apart from the Ryzen 9 9900X3D and its DDR5 memory. It also offers 8 performance and 12 efficient cores and an unlocked multiplier. It undercut the Ryzen 9 7900X and every other pick on price at the time of writing.
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: No
Pros
- 5.6GHz maximum boost
- 20 cores for encoding and background work
- 8 performance and 12 efficient cores
- Unlocked multiplier
Cons
- No cooler in the box
- No integrated graphics, so a graphics card is required
- L3 cache trails the Ryzen 9 9900X3D (128MB)
Best Twelve-Core Value6 of 6
AMD Ryzen 9 7900X on Amazon (opens in a new tab)
The Ryzen 9 7900X offers twelve Zen 4 cores at a lower price than the 9900X.
Best for
- Work-heavy builds that also game.
Skip if
- Skip it if this is a deal-breaker for you: 170W rating calls for a large air cooler or a 280mm-plus AIO.
Why we like it
It suits a workstation budget that still wants AM5. Its 64MB L3 cache ranks fifth of 6 here, behind the Ryzen 9 9900X3D (128MB) and ahead of the Core i7-14700KF (33MB). It matches the Ryzen 7 9850X3D and the Core i7-14700KF on boost clock (5.6GHz).
On core count it ties with the Ryzen 9 9900X3D at 12 cores. On rated power it trails the group at 170W, while the Ryzen 7 9800X3D offers 120W. You also get the Zen 4 architecture, a 5nm process and PCIe 5.0 support on AM5.
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. When we checked, only the Core i7-14700KF cost less, and the Ryzen 7 7800X3D cost more.
Key dimensions & specs
- L3 cache: 64MB
- Max boost: 5.6GHz
- Cores / threads: 12 cores
- Rated power: 170W
- 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
- 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)
How We Chose
Each pick was assessed across 4 criteria weighted for real-world use.
- Power and cooling
- We recorded each chip's rated power and what cooler class it needs.
- Platform cost
- We noted socket, memory type and whether a cooler is included, since they change the real price.
- Upgrade path
- We considered how long each socket is likely to receive new CPUs.
- 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 RX 7900 XTX
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.
Integrated graphics are a useful backup
Chips with integrated graphics can drive a display without a graphics card, which helps when troubleshooting or between upgrades. Intel's F and KF models and most AM4 Ryzen chips have none.
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.
How to Choose a CPUs for RX 7900 XTX
By priority
| Priority | Consider | Why |
|---|---|---|
| 4K and high-refresh 1440p builds | Ryzen 7 9800X3D | Eight Zen 5 cores with 96MB of L3 |
| Players who want the fastest eight-core X3D | Ryzen 7 9850X3D | A 5.6GHz boost with 96MB of L3 |
| Keeping money for the monitor | Ryzen 7 7800X3D | 96MB of L3 at a lower price than the Zen 5 X3D chips at the time of writing |
| Players chasing 1% lows in simulation and esports titles | Ryzen 9 9900X3D | The largest L3 cache here (128MB) |
| Intel builds | Core i7-14700KF | Twenty cores on LGA1700 without integrated graphics |
| Work-heavy builds that also game | Ryzen 9 7900X | Twelve Zen 4 cores at a lower price than the 9900X3D at the time of writing |
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 9850X3D | 96MB | 5.6GHz | 8 cores | 120W |
| Ryzen 7 7800X3D | 96MB | 5GHz | 8 cores | 120W |
| Ryzen 9 9900X3D | 128MB | 5.5GHz | 12 cores | 120W |
| Core i7-14700KF | 33MB | 5.6GHz | 20 cores | 125W |
| Ryzen 9 7900X | 64MB | 5.6GHz | 12 cores | 170W |
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 | Core i7-14700KF, Ryzen 9 7900X, Ryzen 7 7800X3D, Ryzen 7 9800X3D, Ryzen 7 9850X3D |
| About $500 to $1000 | Ryzen 9 9900X3D |
Frequently Asked Questions
Will a new CPU work in my current motherboard?
Only if the socket matches and the board's BIOS supports it. Check the maker's CPU support list for the minimum BIOS version.
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.
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.
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.
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 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.
Bottom Line
The Ryzen 7 9800X3D is the best partner for an RX 7900 XTX, with the 9850X3D for a higher boost and the 7800X3D to save money. The 9900X3D suits streamers, and the i7-14700KF covers Intel.