Intel Core Ultra Names Explained: U, H, HX and V

How to read a Core Ultra model number

Take Intel Core Ultra 7 processor 255H as the example. Intel's processor numbers page splits a name like this into a brand, a tier, a SKU number and a suffix, and each part answers a different question.

The brand is Intel Core Ultra. The number right after it (5, 7 or 9) is the tier: Intel describes the Core Ultra family as Core Ultra 9, Core Ultra 7 and Core Ultra 5, "indicating a performance tier." A higher tier within the same series and suffix means more cores, higher clocks or a larger cache, not a different kind of chip.

The three-digit SKU number comes next. Intel states that Core Ultra processors have a SKU number starting with 1 or 2, representing the generation. So a 155H belongs to Core Ultra Series 1 and a 255H to Series 2. The remaining two digits place the chip within its tier and series; a larger number is generally the better-equipped part of the same line.

The letter at the end is the product line suffix. For Core Ultra mobile chips Intel lists H, U and V, and the separate HX line uses the same Series 2 numbering. Desktop Core Ultra chips use K, F, KF or T, which you will not find in a laptop. When you compare two laptops, read the suffix first, because it tells you more about battery life, weight and sustained speed than the tier number does.

What U, H, HX and V mean

Intel's suffix table defines U as "power efficient," H as "highest performance" and HX as "highest performance, all SKUs unlocked." Intel lists V as a Core Ultra mobile suffix, using the Core Ultra 7 processor 288V as its example, but the table gives V no short definition of its own. The clearest way to see the difference is to line up one tier from each class using Intel's own specification pages.

Processor Base Power is the sustained power figure Intel lists for each chip, and Maximum Turbo Power is the short-burst ceiling. Laptop makers tune within these limits, so the same chip can run a little differently in a thin chassis than in a thick one, but the suffix sets the range.

• U (power efficient): the 255U runs at a 15 W base power with 12 cores. This is the class for thin office and student laptops where battery life and quiet running matter more than peak speed. See the Core Ultra 7 255U laptops guide.
• V (Lunar Lake, low power): the 258V has fewer cores (8) but Intel lists the Arc 140V GPU and a 47 TOPS NPU, the highest NPU figure in this table. Its spec page also lists a 32 GB maximum memory size with LPDDR5X only, so memory cannot be expanded beyond that.
• H (high performance mobile): the 255H steps up to 16 cores, a 28 W base power and the Arc 140T GPU. It suits creators and developers who want more speed in a laptop that is still portable. See the Core Ultra 7 255H laptops guide.
• HX (highest performance): the 255HX has 20 cores, a 55 W base power, a 160 W maximum turbo power, DDR5 support up to 256 GB and 24 PCIe lanes. HX laptops are normally paired with a dedicated GPU, which is why its integrated graphics are the basic Intel Graphics. See the Core Ultra 7 255HX laptops guide.

Tier versus suffix: which matters more

The tier number (5, 7, 9) is the part buyers notice, but it only compares chips inside the same suffix. A Core Ultra 9 U-series chip is still built around a low-power budget, while a Core Ultra 5 HX chip draws on the much larger HX power budget. As a rule of thumb, for long, heavy loads a lower tier in a higher power class is often the better pick than a higher tier in a lower one, because the chip is allowed to use more power for longer.

Use the suffix to choose the kind of laptop, then use the tier to choose how much headroom you want inside that class. Core Ultra 9 is the top tier, most useful in H and HX laptops built for gaming and heavy creative work; the Core Ultra 9 laptops guide collects them. Core Ultra 7 spans every suffix and is the most common middle ground, collected in the Core Ultra 7 laptops guide.

Older Core i5 and Core i7 names (13th and 14th gen)

Before Core Ultra, Intel laptops used the Core i3, i5, i7 and i9 brand, and the generation was written at the start of the number. In Core i7-1355U, the 13 marks a 13th Generation part (Intel lists it under 13th Generation Intel Core i7 Processors), 55 is the SKU and U is the suffix. In Core i7-14650HX, 14 marks the 14th generation and HX the suffix.

The suffixes mean the same things they mean today. The i7-1355U has 10 cores (2 P-cores and 8 E-cores), a 15 W base power and a 55 W maximum turbo power, a classic thin-laptop chip. The i7-14650HX has 16 cores (8 P-cores and 8 E-cores), 24 threads, a 55 W base power and a 157 W maximum turbo power, a gaming laptop chip. Both are from the Raptor Lake family according to Intel.

These chips come from before the Core Ultra rebrand. They remain common in value and gaming laptops; the Core i5 laptops guide and the Core i7-14650HX laptops guide cover them.

Core 5 and Core 7 without Ultra

Intel also sells plain Intel Core processors, without the Ultra and without the i. Intel describes them as delivering "accessible performance for laptops" with a shorter naming scheme that uses a 3-digit processor number. The tiers are Core 3, Core 5 and Core 7, and the first digit is again the series.

The Core 7 processor 150U is a good example of why reading past the brand matters. Intel lists it under Intel Core processors (Series 1), code name Raptor Lake, with 10 cores (2 P-cores and 8 E-cores), 12 threads, a 15 W base power and a 55 W maximum turbo power. That is the same core layout and power class as the 13th generation i7-1355U. It lists the Intel Gaussian and Neural Accelerator 3.0 rather than the Intel AI Boost NPU that Core Ultra chips carry.

So a Core 7 150U laptop is a sensible everyday machine, but it is not a Core Ultra 7 with a different badge. If you want the newer architecture and an NPU, look for the word Ultra. The Core 7 150U laptops guide lists current models.

How to choose by use

Start from what you do on the laptop and how often it leaves the desk. The suffix follows from that answer.

For writing, browsing, office work and classes, a U or V chip is the right class. Both run at low base power, which helps battery life and lets the laptop stay thin and quiet. Choose V if you want the stronger integrated graphics and NPU and are fine with a fixed memory ceiling; choose U if you want the widest choice of laptops and more memory options.

For photo editing, programming and light video work on the move, H is the balanced choice: more cores than U and a stronger integrated GPU, in a laptop that can still travel.

For gaming, 3D, engineering software and long renders, HX is the class to pick, almost always with a dedicated GPU. Expect a heavier laptop and a large power adapter; that is the trade for the highest sustained speed Intel offers in a laptop.

What to pick for your use

Questions

What does the U mean in Intel Core Ultra?

Intel defines the U suffix as power efficient. U chips such as the Core Ultra 7 255U run at a 15 W base power and are used in thin, light laptops where battery life matters most.

Is H or HX better?

HX is the higher performance class. The Core Ultra 7 255HX has 20 cores and a 55 W base power against 16 cores and 28 W for the 255H. H is the better fit if you also want portability and a stronger integrated GPU, since the 255H has the Arc 140T GPU while the 255HX relies on a dedicated graphics card.

What does the V suffix mean?

V marks the Core Ultra Series 2 chips Intel code-named Lunar Lake, such as the 258V. Intel's suffix table gives no short definition for V, but its spec page shows the pattern: 8 cores, a 17 W base power, the Arc 140V GPU, a 47 TOPS NPU and a 32 GB memory limit.

Is a Core Ultra 5 better than a Core i7?

It depends on the suffix and generation, not the tier number. Compare chips within the same power class first, then look at the spec page for core count, power and whether an Intel AI Boost NPU is listed. For more on how laptop graphics compare, see laptop GPU tiers explained.

What does the first digit of the number mean?

For Core Ultra and plain Core chips, Intel says the first digit of the SKU number is the series: 1 for Series 1 (for example 155H or 150U), 2 for Series 2 (for example 255H or 258V). For older Core i chips, the first two digits were the generation, as in i7-1355U for 13th gen.

Does a Core Ultra chip help with local AI?

The Core Ultra chips covered here all list the Intel AI Boost NPU, but larger local models lean mostly on memory and a dedicated GPU. See laptop specs for local AI before choosing on the NPU alone.