A sávszélesség elég.

A is the Hungarian definite article, meaning the.

So:

• a sávszélesség = the bandwidth

Hungarian has two forms of the definite article:

• a before a consonant
• az before a vowel

Since sávszélesség starts with a consonant sound, it takes a.

In Hungarian, the verb to be is often left out in the present tense when the sentence is in the third person.

So English:

• The bandwidth is enough.

Hungarian:

• A sávszélesség elég.

This is completely normal Hungarian grammar.

But in other tenses, or in some other persons, the verb appears:

• A sávszélesség elég volt. = The bandwidth was enough.
• A sávszélesség elég lesz. = The bandwidth will be enough.

Here, elég means enough / sufficient and functions like a predicate adjective.

So the structure is basically:

• A sávszélesség = subject
• elég = predicate meaning enough

Hungarian often uses adjectives this way without an explicit is in the present tense.

Also note that elég can appear in other roles too. For example:

• elég pénz = enough money

There it modifies a noun more directly.

Yes. Sávszélesség is a compound noun.

It is built from:

• sáv = band / stripe / channel
• szélesség = width

So literally it is something like band-width, just as in English bandwidth is also a compound.

Hungarian forms compounds very naturally, and technical vocabulary often works this way.

A rough pronunciation guide is:

shaav-say-lesh-shaag

More carefully:

• s in Hungarian sounds like English sh
• sz sounds like English s
• é is a long ay-like vowel
• á is a long open vowel, somewhat like a in father, but longer

So the parts sound roughly like:

• sáv → shaav
• szé → say
• les → lesh
• ség → shaag or shayg, depending on how fine-grained you want to be

Also remember that Hungarian stress is always on the first syllable:

• SÁVszélesség

The ending -ság / -ség is a very common Hungarian noun-forming suffix. It often creates abstract nouns, somewhat like English -ness or sometimes -ity.

For example:

• szép = beautiful
• szépség = beauty

Here:

• széles = wide
• szélesség = width

So in sávszélesség, the second part literally contains width.

The choice between -ság and -ség follows vowel harmony and sound patterns. Since széles has front vowels, -ség is the expected form.

It is in the nominative case, which is the basic dictionary form.

In this sentence, sávszélesség is the subject:

• A sávszélesség elég. = The bandwidth is enough.

There is no special ending here because Hungarian subjects usually appear in the plain base form.

Yes, but the word order changes the emphasis.

• A sávszélesség elég.
  This is a neutral statement: The bandwidth is enough.

• Elég a sávszélesség.
  This gives more focus to elég, something like: The bandwidth is sufficient / The bandwidth is enough, actually.

Hungarian word order is strongly connected to focus and information structure, not just grammar. So both are possible, but they do not feel exactly identical in emphasis.

Usually, in a normal full sentence like this, A sávszélesség elég is the more natural form if you mean the bandwidth.

If you remove the article, the result sounds less standard in ordinary usage and may feel:

• telegraphic
• headline-like
• context-dependent

If you mean there is enough bandwidth, Hungarian often prefers a different structure altogether:

• Van elég sávszélesség.

That is often more natural than trying to say Bandwidth is enough word-for-word.

No gender marking is involved, because Hungarian does not have grammatical gender like English he/she/it distinctions in nouns.

And elég itself does not agree the way adjectives do in some Indo-European languages. It stays the same:

• A sávszélesség elég. = The bandwidth is enough.
• Az adatok elég gyorsak. = The data are fast enough.

In the second example, the plural marking appears elsewhere in the sentence, not by changing elég into a special gender form.

So the key point is:

• no grammatical gender
• elég itself is basically invariable here

You simply put nem before elég:

• A sávszélesség nem elég. = The bandwidth is not enough.

This is the normal Hungarian way to negate a predicate like this.

You can also use it in other tenses:

• A sávszélesség nem volt elég. = The bandwidth was not enough.
• A sávszélesség nem lesz elég. = The bandwidth will not be enough.

A very natural Hungarian sentence is:

• Van elég sávszélesség.

This literally uses van = there is / is.

So there is a useful difference:

• A sávszélesség elég. = The bandwidth is enough.
• Van elég sávszélesség. = There is enough bandwidth.

Both can work depending on context, but the second one is often the more idiomatic choice when you are talking about availability or quantity.