Variants of Samsung Galaxy S5
The 3G G900H and the SM-G900H are the same, but SM-G900H is the proper name for it.

Now that we know those two devices are the same, we can compare the SM-G900H with the G900F-

SM-G900H

Only supports 3G HSPA+ networks, no LTE support, and will work nearly everywhere in the world except some markets in north/south america

Uses an Exynos 5 Octa 5422 processor (Split into a quad-core 1.9 GHz Cortex-A15, and a quad-core 1.3 GHz Cortex-A7)

Does not have a good development community for custom recoveries/ROMs

SM-G900F

European model

Supports LTE networks (bands 1,3,5,7,8,20)

Uses a Snapdragon 801 (quad core 2.5 GHz)

Has a fairly good development community (custom recoveries/ROMs/etc)

Benchmark



Misc

SM-G900H has a 133 MHz higher stock RAM speed than the SM-g900f, supports hardware assisted virtualization, and is generally more power efficient.