> When it comes to choose a platform for OpenBSD

http://www.openbsd.org/faq/faq3.html#SelectHW

> from almost the same
> performance range,

Range can be defined by intended use, architecture, age, performance,
maintenance, pricing.

You may want to redefine your range for any of the other criteria and
not constrain the choice by performance only.

> what is better to take: AMD cpu + ATI video or
> Intel cpu + GMA video?

Whatever you like mostly, the choice usually is to pick the better for
the money according to availability.

Adding a low power Radeon graphics card gives more options.

Take into consideration the power usage, heat dissipation and noise as
primary factors.

> Is there another advantage from OpenBSD point of view to choose one
> brand over another.

ECC RAM is not usually on desktop CPUs. OpenBSD runs fine regardless of
brand. The preferred choice depends mostly on the age (release year) of
the CPU and main board.

> I know about ATI drivers, but I'm not aware about
> cpu business.

The newer CPUs will have more main boards supporting them and
replacements for add-on cards over time.
 
> If it helps, one example can be used for cpu, AMD Athlon II X4 B26 vs.
> Intel Core 2 Duo E8400.

You could try with newer CPUs (lithography process) in the same price
range for thermal and performance efficiency.

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