The most common and most likely answer to this crossword clue is the 8 letter word GIGABYTE
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More clues leading to the result GIGABYTE
Buddy explains!

The straight part
We know that "GB's" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gb's = gigabyte.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does GIGABYTE mean?
GIGABYTE noun- (SI) 109, one billion (1,000,000,000) bytes. SI symbol: GB
- A gibibyte or 10243 (1,073,741,824) bytes.