Select any two CPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game Core i7-8665U 4-Core 1.9GHz Celeron M ULV 423 1.06GHz
Cyberpunk 2077 30% 3731%
Call of Duty Warzone 13% 3243%
Grand Theft Auto VI 122% 6448%
Assassins Creed: Valhalla 63% 4728%
Maneater 30% 3731%
Valorant 22% 2209%
Saints Row 3 Remastered 63% 4708%
Mount and Blade 2: Bannerlord 106% 5973%
Doom Eternal 82% 5264%
Mafia 2: Definitive Edition 26% 3609%

In terms of overall gaming performance, the Intel Core i7-8665U 4-Core 1.9GHz is massively better than the Intel Celeron M ULV 423 1.06GHz when it comes to running the latest games. This also means it will be less likely to bottleneck more powerful GPUs, allowing them to achieve more of their gaming performance potential.

The Core i7-8665U 4-Core was released over three years more recently than the Celeron M ULV, and so the Core i7-8665U 4-Core is likely to have far better levels of support, and will be much more optimized and ultimately superior to the Celeron M ULV when running the latest games.

The Core i7-8665U 4-Core has 3 more cores than the Celeron M ULV. With 4 cores, the Core i7-8665U 4-Core is much less likely to struggle with the latest games, or bottleneck high-end graphics cards when running them.

More important for gaming than the number of cores and threads is the clock rate. Problematically, unless the two CPUs are from the same family, this can only serve as a general guide and nothing like an exact comparison, because the clock cycles per instruction (CPI) will vary so much.

The Core i7-8665U 4-Core and Celeron M ULV are not from the same family of CPUs, so their clock speeds are by no means directly comparable. Bear in mind, then, that while the Core i7-8665U 4-Core has a 0.84 GHz faster frequency, this is not always an indicator that it will be superior in performance, despite frequency being crucial when trying to avoid GPU bottlenecking. In this case, however, the difference is probably a good indicator that the Core i7-8665U 4-Core is superior.

Aside from the clock rate, the next-most important CPU features for PC game performance are L2 and L3 cache size. Faster than RAM, the more cache available, the more data that can be stored for lightning-fast retrieval. L1 Cache is not usually an issue anymore for gaming, with most high-end CPUs eking out about the same L1 performance, and L2 is more important than L3 - but L3 is still important if you want to reach the highest levels of performance. Bear in mind that although it is better to have a larger cache, the larger it is, the higher the latency, so a balance has to be struck.

The Core i7-8665U 4-Core has a 1023 KB bigger L2 cache than the Celeron M ULV, and although the Celeron M ULV does not appear to have an L3 cache, its larger L2 cache means that it wins out in this area.

The maximum Thermal Design Power is the power in Watts that the CPU will consume in the worst case scenario. The lithography is the semiconductor manufacturing technology being used to create the CPU - the smaller this is, the more transistors that can be fit into the CPU, and the closer the connections. For both the lithography and the TDP, it is the lower the better, because a lower number means a lower amount of power is necessary to run the CPU, and consequently a lower amount of heat is produced.

The Core i7-8665U 4-Core has a 30 Watt lower Maximum TDP than the Celeron M ULV, and was created with a 51 nm smaller manufacturing technology. What this means is the Core i7-8665U 4-Core will consume significantly less power and consequently produce less heat, enabling more prolonged computational tasks with fewer adverse effects. This will lower your yearly electricity bill significantly, as well as prevent you from having to invest in extra cooling mechanisms (unless you overclock).

The Core i7-8665U 4-Core has an on-board GPU, which means that it will be capable of running basic graphics applications (i.e., games) without the need for a dedicated graphics card. The Celeron M ULV, however, does not, and you will probably have to look for a dedicated card if you wish to use it at all.

For in-depth GPU comparisons with the Intel UHD Graphics 630, click on the following GPU overview comparison icon (visible throughout Game-Debate), and choose a GPU from the list to compare against:

On-board GPUs tend to be fairly awful in comparison to dedicated cards from the likes of AMD or Nvidia, but as they are built into the CPU, they also tend to be cheaper and require far less power to run (this makes them a good choice for laptops). We would recommend a dedicated card for running the latest games, but integrated GPUs are improving all the time and casual gamers may find less recent games perform perfectly acceptably.

CPU Core Details

CPU CodenameWhiskey Lake-
MoBo SocketFCBGA1528Socket 479
Notebook CPUyesyes
Release Date16 Apr 201901 Jul 2006
CPU LinkGD LinkGD Link

CPU Technical Specifications

CPU Cores4vs1
CPU Threads8vs-
Clock Speed1.9 GHzvs1.06 GHz
Turbo Frequency4.8 GHzvs-
System Bus -vs533 MHz
Max TDP25 Wvs55 W
Lithography14 nmvs65 nm
Bit Width64 Bitvs32 Bit
Voltage Range-vs0.85V-1.10V KB
Max Temperature100°Cvs-
Virtualization Technologynovsno

CPU Cache and Memory

L1 Cache Size256 KBvs-
L2 Cache Size1024 KBvs1 KB
L2 Cache Speed-vs-
L3 Cache Size8192 MBvs-
Max Memory Size-vs-
Memory Channels-vs-
ECC Memory Supportnovsno

CPU Graphics

GraphicsIntel UHD Graphics 630
Base GPU Frequency-vs-
Max GPU Frequency-vs-
Displays Supported-vs-

CPU Package and Version Specifications

Package Size-vs35mm x 35mm
PCIe Revision-vs-
PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewThe Intel Core i7-8665U 4-Core 1.9GHz is a power efficient mobile CPU based on the 14nm mobile Whiskey Lake architecture. It offers 4 Physical Cores (8 Logical), initially clocked at 1.9GHz, which may go up to 4.8GHz turbo boost on a single core, 4.5 GHz boost on 2 cores, or 4.1 GHz turbo across all 4 cores. It also has 8MB of L3 Cache, 1MB L2 Cache and 256KB L1 cache. Among its many features, HyperThreading, Turbo Boost, and Virtualization are activated. The processor integrates Graphics called Intel UHD 620, initially clocked at 300MHz and that goes up to 1.15GHz in Turbo Mode, which shares the L2 Cache and system RAM with the processor. Both the processor and integrated graphics have a rated board TDP of 25W. The integrated GPU offers low-end gaming performance which may be suitable for eSports titles at 720p resolution. The performance of this processor is fairly good and will be sufficient for most modern AAA titles.Merom is the code name for various Intel processors that are sold as Core 2 Duo, Core 2 Solo, Pentium Dual-Core and Celeron. It was the first mobile processor to be based on the Core microarchitecture, replacing the Enhanced Pentium M based Yonah processor. Merom has product code 80537, which is shared with Merom-2M and Merom-L that are very similar but have a smaller L2 cache. Merom-L has only one processor core and a different CPUID model. The desktop version of Merom is Conroe and the dual-socket server version is Woodcrest. Merom has subsequently been replaced by Penryn.