We will continue to hear conflicting reports about the Galaxy S8's specifications until the handset is actually launched early next year so don't completely put your faith in one such rumor or report just yet. Word on the street in China is that the Galaxy S8 will feature 6GB of RAM and that it's going to offer storage options of up to 256GB.
If this is true, it will be a departure from the strategy that Samsung used with the Galaxy S7 which features just 32GB of internal storage but also supports external expansion via microSD card. Samsung decided to bring back the microSD card slot with the Galaxy S7 after taking a lot of flak for removing it from the Galaxy S6. This new strategy would mean that Samsung matches Apple's latest iPhone in terms of storage as the iPhone 7 can also be had with up to 256GB of internal storage.
It's not a simple equation when it comes to RAM. Just because a handset has 8GB of RAM doesn't mean that it's going to perform better than a handset with 6GB of RAM. There are many different variables that dictate device performance so it's never just one component. 6GB of RAM for the Galaxy S8 can be viewed as a logical step up but previous rumors of 8GB RAM for the Galaxy S8 appear to be overkill, at least in my opinion, though I should point out here that just last month Samsung introduced the industry's first 8GB LPDDR4 mobile DRAM package.
Samsung is expected to launch the Galaxy S8 at Mobile World Congress 2017 in February.