Intel Core Ultra vs Core i: what changed and which to buy

Intel dropped the "i" in late 2024. Core i5, i7 and i9 became Core Ultra 5, Ultra 7 and Ultra 9, and the change wasn't cosmetic. The chips are built differently, and they require a different motherboard than the Core i series. Interestingly, Intel didn’t release an Ultra model to replace the i3 CPUs.

The Ultra Series 2 Desktop CPUs debuted in October 2024 with the K variants being the first to release, followed by the non-K variants in January 2025. The Ultra Series 1 was released in December 2023, but they were CPUs for mobile only. Compared to the Core i’s, the Core Ultras have more cores, increased clock speeds, and additional L1/2 cache, bringing much better performance. So, the honest answer is that the Core Ultras are now the right choice for a new build, while Core i remains perfectly good value if you're buying at the budget end or you already own the motherboard.

Here's what's actually different.

The biggest question for people looking to upgrade is the about the socket. The Core Ultra desktop chips use the LGA1851socket on 800-series motherboards, whereas the Core i CPUs from the 12th, 13th and 14th generations use the LGA1700 socket that are on the 600 and 700 series motherboards. Therefore, they aren't interchangeable; if you're upgrading an existing PC rather than building a new one, then upgrading to an Ultra will require a change in motherboard and potentially a change in RAM.

The Core Ultras only use DDR5 RAM (or Random Access Memory), whereas the late Core i boards had DDR4 and DDR5 variants that supports the corresponding RAM. DDR5 is the new standard for RAM as its more efficient and faster than DDR4, so Intel dropped DDR4 support when releasing the Ultra CPUs. Since the Core i’s and DDR4 are becoming succeeded by newer models, you will see cheaper builds still using them. However, that does not mean that they aren’t good for gaming.

The CPU architecture itself has changed; moving to a tile-based design, where the CPU is assembled from separate pieces of silicon rather than cut from one like the Core i series. The Ultra series is comprised on 4 tiles: a Compute tile (P and E cores), a Graphics tile (handling the Arc integrated graphics), a SoC tile (for low-power tasks and connectivity), and a dedicated NPU tile (for AI acceleration).

Hyper-Threading is gone, replaced by new E-cores that handle multi-thread workloads more efficiently than additional threads the Core i series has. Therefore, the Core Ultra series, only has 1 thread per physical core, improving power efficiency and sustained performance. For example, a Core Ultra 5 225 has 10 cores and 10 threads, whereas the predecessor Core i5-14400 has 10 cores and 16 threads. It looks like a downgrade on a spec sheet, but it isn’t because the efficiency cores do the work the extra threads used to. If you compare two chips by thread count alone, you will reach the wrong conclusion.

Intel released the Core Ultra 200S Plus parts in March 2026, sold as an Arrow Lake refresh rather than a new generation. Same socket, same architecture, drop-in compatible with existing 800-series boards after a firmware update.

The changes are real rather than cosmetic. The Core Ultra 7 270K Plus enables the full silicon at 8 performance cores and 16 efficiency cores (24 cores total), with the complete 36MB of L3 cache, which is the same spec as the Ultra 9 285K. Benchmarks has shown the Ultra 7 270K Plus to be performing the same as the Ultra 9 285K for less cost. The Core Ultra 5 250K Plus adds 4 efficiency cores over the Ultra 5 245K and 8 mor efficiency cores over the Ultra 5 225. The Ultra 200S Plus series officially support faster memory than the previous models, going up to 7200MHz.

Intel also released a Binary Optimization Tool that analyses how software binaries feed instructions and data into Intel hardware and optimises the feed without changing the original game executable. The BOT requires the latest Intel Platform Performance Package and for it to be turned on inside the Intel Application Optimisation user interface. Intel's own figures suggest an average in the region of 15% across supported games, with much larger gains in a handful of specific titles. Those are vendor numbers measured under conditions Intel chose, so treat them as the optimistic end rather than what you'll see actually see. This also only affects the supported games on Intel’s compatibility list, which Intel has been adding to with each update to the tool. However, this is technically a binary modification tool, so it will be difficult for Intel to implement compatibility with games that utilise an aggressive anti-cheat, as the anti-cheat might flag the modification and promptly ban the player. This will likely mean BOT compatibility with newer online games, and some single-player titles is impossible, as these aggressive anti-cheats have become the norm.

You may have read about instability affecting some 13th and 14th generation Core i series CPUs, caused by voltage behaviour that could degrade the CPU over time. It was a genuine problem, and Intel addressed it with firmware updates, extending warranty cover on affected parts.

The chips most affected were the higher end i7 and i9 models. Low end i5/i3 CPU like the 14400F, which is what most budget and mid-range Core i builds actually use, weren't the focus of the issue. Any system built now ships with the fixed firmware. It's worth knowing about rather than worrying about, though it's a fair reason to prefer a current platform if you're spending at the top end.

Building new, mid-range or above: Core Ultra: you get the current socket, which means upgrade options later, and the refresh parts are strong. The Ultra 7 270K Plus is the interesting one, since it gets you close to flagship performance without flagship pricing. See the Core Ultra range.

Building new on a tight budget: Core i still makes sense as a 12400F or 14400F paired with a decent graphics card delivers a lot of gaming performance per pound, and DDR4 boards keep the total cost down. Browse Intel i5 gaming PCs.

Upgrading an existing LGA1700 machine: Stay on Core I, because moving to Core Ultra means a new motherboard and probably new memory, at which point you're building a new PC rather than upgrading one. A 14^th generation CPU is a substantial step up from their equivalent 12th generation counterpart and costs less than a platform change. See the 14th generation range.

Gaming at the very top, or gaming plus creative work: The Ultra 9 285K is the flagship, and the efficiency cores genuinely help if you stream or render alongside playing. Look at Intel i9 tier builds and the Ultra 7 tier.

For gaming, the CPU is rarely where the biggest gains come from. If you're deciding between a better Intel chip or a better graphics card, and you play at 1440p or 4K, the graphics card almost always wins.

You can see the whole Intel range or set the balance yourself in the PC configurator.

What to read next 

• CPU buyers guide
• Motherboard buyer guide for chipsets and what each one gives you.
• DDR5 for gaming speed, capacity and what CL30 means