All Atom Models
By Rafael Coelho on February 5, 2010


Atom is a low-power CPU from Intel targeted to laptops or handheld devices with internet access. In this tutorial we will explore this CPU's technical specifications and will list all models released so far.

It is important to know that there are two flavors of Atom CPUs. Atom series 2xx, 3xx, Nxxx and Dxxx – codenamed “Diamondville” – are targeted to low-power desktops and laptops (because they use chipsets from Intel 945 series, which are big and use two chips) while Atom series Z5xx – codenamed “Silverthorne” – are targeted to handheld devices with internet access, not only because they use a new chipset called US15W, which is very small and uses only one chip, but also because Atom Z5xx CPUs are physically smaller than other Atom CPUs (14 x 13 mm against 22 x 22 mm). They also have a different pinout: Z5xx series uses a 441-pin grid while other models use a 437-pin grid.

Atom is based on a different microarchitecture from other Intel processors (Core microarchitecture), but has the same instruction set of CPUs based on Core microarchitecture, like Core 2 Duo. The main difference from the Atom microarchitecture is that it processes instructions in order, which is the way CPUs up to the first Pentium used to work. CPUs starting with Pentium Pro and Pentium II use an out-of-order engine. This change was made in order to save energy, since the components in charge of issuing and controlling microinstructions execution could be removed. Atom can decode two instructions per clock cycle. If you want to know more about Atom architecture, read our Inside Atom Architecture tutorial.

Atom CPUs have a 32 KB L1 instruction cache, a 24 KB L1 data cache and a 512 KB L2 cache (1 MB on dual-core model). They don’t have an integrated memory controller, so memory types and maximum sizes are defined by the memory controller inside the chipset, not by the CPU.

Most Atom also features Hyper-Threading technology, which is the ability of using unused CPU units to form a second virtual CPU, making the operating system to see each CPU core as having two CPUs (two threads, on the industry’s jargon) even though only one core is physically present. Of course this technique is less efficient than having two real CPU cores, but this extra core – and thus extra performance – you are gaining for free.

Another characteristic is that most Atom processors do not support Enhanced Speedstep technology, nor any other technology that would allow it to slow down when idle. So, they always work at full clock speed. Only Nxxx models brings this tecnology.

The main specifications for Atom CPU include:

Now let’s see Atom models released so far.


On table below we listed all Atom models released so far.

sSpecModelInternal Clock External Clock Cores TDP (W)Max. Temp. (°C)Voltage (V)Hyper-Threading EM64TVT
SLGPTZ550 2.0 GHz 533 MHz 1 2.4 - -YesNoYes
SLB2M Z540 1.86 GHz 533 MHz 1 2.4 90 0.75 - 1.1 YesNo Yes
SLGPN Z530P 1.6 GHz 533 MHz 1 2.2 85 0.85 - 1.1 YesYes Yes
SLB6PZ530 1.6 GHz 533 MHz 1 2 90 0.75 - 1.1 YesNo Yes
SLGPP Z520PT 1.33 GHz 533 MHz 1 2.2 107 0.9 - 1.1 YesYes Yes
SLB2H Z520 1.33 GHz 533 MHz 1 290 0.75 - 1.1 YesNo Yes
SLGMG Z515 1.2 GHz 400 MHz 1 1.4 -0.712 - 1.0 YesNo No
SLGPR Z510PT 1.1 GHz400 MHz 1 2.2 107 0.9 - 1.1 YesYes No
SLGPQ Z510P 1.1 GHz 400 MHz 1 2.2 85 0,85 - 1,1 YesYes No
SLB2C Z510 1.1 GHz 400 MHz 1 2 900.75 - 1.1 No No No
SLB6Q Z500800 MHz 400 MHz 1 0.65 90 0.712 - 1.0 YesNo No
SLBLA D510 1.66 GHz - 2 13 100 0.8 - 1.175YesYes No
SLBMG N450 1.66 GHz - 1 5.5 100 0.8 - 1.175 Yes Yes No
SLGL9N2801.66 GHz667 MHz12.5900.9 - 1.6YesNo No
SLB73 N270 1.6 GHz 533 MHz 1 2.5 90 0.9 - 1.1 YesNoNo
SLG9Y 330 1.6 GHz 533 MHz 2 8 85.2 0.9 - 1.162 YesYes No
SLB6Z 230 1.6 GHz 533 MHz 1 4 85.2 0.9 - 1.162 YesYes No

TDP stands for Thermal Design Power and indicates the CPU thermal dissipation, i.e., the CPU cooler must be capable of dissipating at least this amount of heat.

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