Buying Guide
The Best CPUs for Machine Learning
Four processors compared, from the Core Ultra 5 245KF to the Ryzen 9 9950X3D, with the trade-offs of each named.
By The PC Journal editorial team
11 min read4 products evaluated
For machine learning the GPU does the training, but the CPU feeds data, runs preprocessing and handles smaller models. Every pick has 12 or more cores on a current AM5 or LGA1851 platform, ordered by thread count.
Our comparison rests on published figures for L3 cache, max boost and cores / threads; where a maker leaves a figure out, we say so, and no figure here comes from our own testing.
Quick Picks
Our 4 recommendations at a glance. Tap a pick for the full verdict.
Also Consider
AMD Ryzen 9 9950X
AMD's recommendation of a liquid cooler.
Best for: Buyers who want AMD's recommendation of a liquid cooler.
Our take Check price for AMD Ryzen 9 9950X (opens in a new tab)
Largest Game Cache
AMD Ryzen 9 9950X3D
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 9950X3D (opens in a new tab)
Highest Core Count
Intel Core Ultra 7 265KF
The highest core count here (20 cores).
Best for: Buyers who put core count first.
Our take Check price for Intel Core Ultra 7 265KF (opens in a new tab)
Lowest Price Here
Intel Core Ultra 5 245KF
Undercutting the Core Ultra 7 265KF on price when we checked.
Best for: Buyers who would rather put the savings elsewhere in the build.
Our take Check price for Intel Core Ultra 5 245KF (opens in a new tab)
| Pick | Why it’s here | Best for | Price |
|---|---|---|---|
| AMD's recommendation of a liquid cooler. | Buyers who want AMD's recommendation of a liquid cooler. | Check price for AMD Ryzen 9 9950X (opens in a new tab) |
| The largest L3 cache here (128MB). | Players chasing 1% lows in simulation and esports titles. | Check price for AMD Ryzen 9 9950X3D (opens in a new tab) |
| The highest core count here (20 cores). | Buyers who put core count first. | Check price for Intel Core Ultra 7 265KF (opens in a new tab) |
| Undercutting the Core Ultra 7 265KF on price when we checked. | Buyers who would rather put the savings elsewhere in the build. | Check price for Intel Core Ultra 5 245KF (opens in a new tab) |
Our Picks
Also Consider1 of 4
AMD Ryzen 9 9950X on Amazon (opens in a new tab)
The Ryzen 9 9950X gives 16 cores and 32 threads without the X3D premium.
Best for
- Buyers who want AMD's recommendation of a liquid cooler.
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 is the better buy when CPU encoding and editing matter more than the last few frames per second. Its 64MB L3 cache ranks second of 4 here, behind the Ryzen 9 9950X3D (128MB) and ahead of the Core Ultra 5 245KF (24MB). It matches the Ryzen 9 9950X3D on boost clock (5.7GHz).
On rated power it ties with the Ryzen 9 9950X3D at 170W. Like the Ryzen 9 9950X3D, it has an AM5 socket, while the Core Ultra 7 265KF uses an LGA1851 socket. It also comes with AMD's recommendation of a liquid cooler.
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.
Key dimensions & specs
- L3 cache: 64MB
- 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
- 64MB of L3 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
- Costs more than the Core Ultra 5 245KF at the time of writing
Largest Game Cache2 of 4
AMD Ryzen 9 9950X3D on Amazon (opens in a new tab)
The Ryzen 9 9950X3D adds a second eight-core die to the X3D formula, giving 16 cores for work while keeping 3D V-Cache for games.
Best for
- Players chasing 1% lows in simulation and esports titles.
Skip if
- Choose another pick if you can't accept this: 170W rating calls for a large air cooler or a 280mm-plus AIO.
Why we like it
It suits a single machine that must game and render. On L3 cache it leads this guide at 128MB, ahead of the Ryzen 9 9950X (64MB). It matches the Ryzen 9 9950X on boost clock (5.7GHz).
On rated power it ties with the Ryzen 9 9950X at 170W. Like the Ryzen 9 9950X, it has an AM5 socket, while the Core Ultra 7 265KF uses an LGA1851 socket. It also comes with a design aimed at both games and content creation.
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. At our last price check it topped the group, with the Ryzen 9 9950X the nearest cheaper option. Rated power is its weakest area, and the Core Ultra 7 265KF covers it better at 125W.
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 Core Ultra 7 265KF (125W)
Highest Core Count3 of 4
Intel Core Ultra 7 265KF on Amazon (opens in a new tab)
The Core Ultra 7 265KF is the 265K without integrated graphics.
Best for
- Buyers who put core count first.
Skip if
- Look at the others if this bothers you: no cooler in the box.
Why we like it
It costs less and needs a graphics card for any display output. On L3 cache it sits mid-pack at 30MB: the Ryzen 9 9950X3D offers 128MB, and the Core Ultra 5 245KF comes in at 24MB. On boost clock it sits mid-pack at 5.5GHz: the Ryzen 9 9950X offers 5.7GHz, and the Core Ultra 5 245KF comes in at 5.2GHz.
Nothing else here matches its 20 cores core count; the Ryzen 9 9950X comes closest at 16 cores. It matches the Core Ultra 5 245KF on rated power (125W). It also comes with 8 performance and 12 efficient cores and an unlocked multiplier.
On price it sat second of 4, between the cheaper Core Ultra 5 245KF and the pricier Ryzen 9 9950X, at the time of writing. The main gap: no integrated graphics, unlike the Ryzen 9 9950X. If that matters, the Ryzen 9 9950X has it.
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: No
Pros
- 5.5GHz 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
- Costs more than the Core Ultra 5 245KF at the time of writing
Lowest Price Here4 of 4
Intel Core Ultra 5 245KF on Amazon (opens in a new tab)
The Core Ultra 5 245KF is the entry to LGA1851, with 14 cores and no integrated graphics.
Best for
- Buyers who would rather put the savings elsewhere in the build.
Skip if
- Choose another pick if you can't accept this: no cooler in the box.
Why we like it
It needs a graphics card to show a picture, which every gaming build has anyway. On L3 cache it trails the group at 24MB, while the Ryzen 9 9950X3D offers 128MB. On boost clock it trails the group at 5.2GHz, while the Ryzen 9 9950X offers 5.7GHz.
Its 14 cores core count is the lowest in this group; the Core Ultra 7 265KF leads at 20 cores. It matches the Core Ultra 7 265KF on rated power (125W). It shares an LGA1851 socket with the Core Ultra 7 265KF; the Ryzen 9 9950X3D goes with an AM5 socket.
You also get 6 performance and 8 efficient cores, Intel 800-series chipset support and PCIe 5.0 support. It needs an LGA1851 board (Intel 800-series chipset) and DDR5 memory; LGA1700 boards and coolers without an LGA1851 mounting kit will not fit. It was the cheapest of the group when we checked; the Core Ultra 7 265KF was the next step up.
Key dimensions & specs
- L3 cache: 24MB
- Max boost: 5.2GHz
- Cores / threads: 14 cores
- Rated power: 125W
- Threads: 14
- Socket: LGA1851
- Memory: DDR5
- Cooler in box: No
- Integrated graphics: No
Pros
- 14 cores for encoding and background work
- 6 performance and 8 efficient cores
- Intel 800-series chipset support
- PCIe 5.0 support
Cons
- No cooler in the box
- No integrated graphics, so a graphics card is required
- L3 cache trails 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.
- 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.
- Platform cost
- We noted socket, memory type and whether a cooler is included, since they change the real price.
What to Look for in a CPUs for Machine Learning
Key buying criteria so you get the right fit the first time.
Where these picks differ: L3 cache
Among these picks, L3 cache runs from 24MB on the Core Ultra 5 245KF to 128MB on the Ryzen 9 9950X3D. Settle how much you need before comparing prices, since paying for more rarely helps if your use never reaches it.
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.
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.
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.
How to Choose a CPUs for Machine Learning
By priority
| Priority | Consider | Why |
|---|---|---|
| Buyers who want AMD's recommendation of a liquid cooler | Ryzen 9 9950X | AMD's recommendation of a liquid cooler |
| Players chasing 1% lows in simulation and esports titles | Ryzen 9 9950X3D | The largest L3 cache here (128MB) |
| Buyers who put core count first | Core Ultra 7 265KF | The highest core count here (20 cores) |
| Buyers who would rather put the savings elsewhere in the build | Core Ultra 5 245KF | Undercutting the Core Ultra 7 265KF on price when we checked |
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 9 9950X | 64MB | 5.7GHz | 16 cores | 170W |
| Ryzen 9 9950X3D | 128MB | 5.7GHz | 16 cores | 170W |
| Core Ultra 7 265KF | 30MB | 5.5GHz | 20 cores | 125W |
| Core Ultra 5 245KF | 24MB | 5.2GHz | 14 cores | 125W |
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 $150 to $250 | Core Ultra 5 245KF |
| About $250 to $500 | Core Ultra 7 265KF, Ryzen 9 9950X |
| About $500 to $1000 | Ryzen 9 9950X3D |
Frequently Asked Questions
Which pick leads on core count?
The Core Ultra 7 265KF leads at 20 cores, ahead of the Ryzen 9 9950X at 16 cores; the Core Ultra 5 245KF sits at the other end with 14 cores.
Which pick costs the least here?
Start with the Core Ultra 5 245KF, the lowest-priced pick when we checked. The Ryzen 9 9950X3D is the premium end, so the spread between them shows what extra money buys here.
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.
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.
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.
Bottom Line
Our first pick is the Ryzen 9 9950X, chosen for AMD's recommendation of a liquid cooler. Look at the Core Ultra 7 265KF for the highest core count here (20 cores) and the Core Ultra 5 245KF for undercutting the Core Ultra 7 265KF on price when we checked if those matter more to you.
Spend on the GPU's VRAM first; a faster CPU won't rescue a model that doesn't fit.