Select any two CPUs for comparison
VS

Gaming Performance Comparison

Recommended System Requirements
Game Celeron M ULV 423 1.06GHz Atom Z650 1.2GHz
Cyberpunk 2077 3731% 4119%
Minecraft: Dungeons 3731% 4119%
Call of Duty Warzone 3243% 3582%
Grand Theft Auto VI 6448% 7111%
Assassins Creed: Valhalla 4728% 5216%
Valorant 2209% 2443%
Maneater 3731% 4119%
Phantasy Star Online 2 712% 794%
Doom Eternal 5264% 5807%
Mount and Blade 2: Bannerlord 5973% 6588%

In terms of overall gaming performance, the Intel Celeron M ULV 423 1.06GHz is marginally better than the Intel Atom Z650 1.2GHz 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 Atom Z650 1.2GHz was released less than a year after the Celeron M ULV, and so they are likely to have similar levels of support, and similarly optimized performance when running the latest games.

Both CPUs exhibit very poor performance, so rather than upgrading from one to the other you should consider looking at more powerful CPUs. Neither of these will be able to run the latest games in any playable way.

The Celeron M ULV and the Atom Z650 1.2GHz both have 1 cores, and so are quite likely to struggle with the latest games, or at least bottleneck high-end graphics cards when running them. With a decent accompanying GPU, the Celeron M ULV and the Atom Z650 1.2GHz may still be able to run slightly older games fairly effectively.

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 Celeron M ULV and Atom Z650 1.2GHz 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 Atom Z650 1.2GHz has a 0.14 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. As such, we need to look elsewhere for more reliable comparisons.

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 Atom Z650 1.2GHz has a 511 KB bigger L2 cache than the Celeron M ULV, but neither of the CPUs have L3 caches, so the Atom Z650 1.2GHz wins out in this area with its larger L2 cache.

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 Atom Z650 1.2GHz has a 52 Watt lower Maximum TDP than the Celeron M ULV, and was created with a 20 nm smaller manufacturing technology. What this means is the Atom Z650 1.2GHz 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).

CPU Core Details

CPU Codename-Lincroft
MoBo SocketSocket 479BGA 518
Notebook CPUyesyes
Release Date01 Jul 200611 Apr 2011
CPU LinkGD LinkGD Link
Approved

CPU Technical Specifications

CPU Cores1vs1
Clock Speed1.06 GHzvs1.2 GHz
Turbo Frequency-vs-
System Bus 533 MHzvs-
Max TDP55 Wvs3 W
Lithography65 nmvs45 nm
Bit Width32 Bitvs-
Voltage Range0.85V-1.10V KBvs-
Virtualization Technologynovsno
Comparison

CPU Cache and Memory

L1 Cache Size-vs56 KB
L2 Cache Size1 KBvs512 KB
L2 Cache Speed-vs-
L3 Cache Size-vs-
ECC Memory Supportnovsno
Comparison

CPU Graphics

Graphicsno
Base GPU Frequency-vs-
Max GPU Frequency-vs-
DirectX-vs-
Displays Supported-vs-
Comparison

CPU Package and Version Specifications

Package Size35mm x 35mmvs-
Revision-vs-
PCIe Revision-vs-
PCIe Configurations-vs-

Gaming Performance Value

Performance Value

CPU Mini Review

Mini ReviewMerom 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.Intel Atom is the brand name for a line of ultra-low-voltage IA-32 and x86-64 CPUs (or microprocessors) from Intel, originally designed in 45 nm CMOS with subsequent models, codenamed Cedar, using a 32 nm process. Atom is mainly used in netbooks, nettops, embedded applications ranging from health care to advanced robotics, and mobile internet devices (MIDs).