It's "up to" 8MB.  The first block was about 2MB and the rest have been much much smaller:  https://cash.coin.dance/blocks#blockDetails

On 2 August 2017 at 09:11, Russell via talk <talk@gtalug.org> wrote:
Now ... Eight Megabytes And Constantly Swapping

Things just got tougher for little miners.

http://www.bbc.com/news/technology-40800270

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Russell
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