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CPU Core Details

CPU Codename Mendocino Yonah
MoBo Socket Socket 370 Socket 479
Notebook CPU yes yes
Release Date 04 Jan 1999 23 Apr 2006
CPU Link GD Link GD Link
Approved

CPU Technical Specifications

{
CPU Cores 1 1
Clock Speed 0.4 GHz 1.2 GHz
Turbo Frequency - -
System Bus 66 MHz -
Max TDP 14 W 6 W
Lithography 250 nm 65 nm
Bit Width - -
Voltage Range 1.6V KB -
Max Temperature 100°C -
Virtualization Technology no no

CPU Cache and Memory

L1 Cache Size 32 KB 64 KB
L1 Cache Count 2 -
L2 Cache Size 128 KB 2048 KB
L2 Cache Count 1 -
L2 Cache Speed - -
L3 Cache Size - -
Memory Types
ECC Memory Support no no

CPU Graphics

Integrated Graphics no no

CPU Mini Review

Mini Review The Mendocino Celeron, launched 24 August 1998, was the first retail CPU to use on-die L2 cache. Whereas Covington had no secondary cache at all, Mendocino included 128 KB of L2 cache running at full clock rate. The first Mendocino-core Celeron was clocked at a then-modest 300 MHz but offered almost twice the performance of the old cacheless Covington Celeron at the same clock rate. To distinguish it from the older Covington 300 MHz, Intel called the Mendocino core Celeron 300A. Although the other Mendocino Celerons (the 333 MHz part, for example) did not have an A appended, some people call all Mendocino processors Celeron-A regardless of clock rate. Yonah was the code name for (the core of) Intel's first generation of 65 nm process mobile microprocessors, based on the Banias/Dothan-core Pentium M microarchitecture. SIMD performance has been improved through the addition of SSE3 instructions and improvements to SSE and SSE2 implementations, while integer performance decreased slightly due to higher latency cache. Additionally, Yonah includes support for the NX bit.

Gaming Performance Comparison

In terms of overall gaming performance, the Intel Core Solo U1400 1.2GHz is very slightly better than the Intel Celeron Mobile 400MHz 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.

Both the Celeron Mobile 400MHz and the Core Solo U1400 1.2GHz were released at the same time, so are likely to be quite similar.

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 Mobile 400MHz and the Core Solo U1400 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, theCeleron Mobile 400MHz and the Core Solo U1400 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 Mobile 400MHz and Core Solo U1400 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 Solo U1400 has a 0.8 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 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 <span class='gpu2Mention'>Core Solo U1400</span> has a 1920 KB bigger L2 cache than the <span class='gpu1Mention'>Celeron Mobile 400MHz</span>, but neither of the CPUs have L3 caches, so the <span class='gpu2Mention'>Core Solo U1400</span> 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.