Thanks KT but all these sites disqualify themselves with one or the other statement.
For instance this one:
Beginning with the V4 model, it was planned to use four high performance BMW 801 E engines with turbochargers and GM-1 boost system.
Yeah... well... indeed, at the design stage of the Me-264, performance trials of the BMW 801 engines were yet unfinished, which is why Messerschmitt considered adding GM-1 boost to these engines at all.
What this site "forgets" to mention in case of GM-1 is that there's been a trade when having GM-1 on that plane: It would have to be carried in the bomb bay!
Which means: No (or no useful) bombload was possible when the plane was equipped with GM-1.
Which in turn was the reason why this option was considered for reconnaissance versions of the Me-264 at later stage only, and once the data from BMW 801 performance trials was available, it has been dropped completely.
Rather than sweeping across random internet sites with questionable sources, I prefer diving into well researched books.
In this case, "Messerschmitt Me 264 - Amerika Bomber - The Luftwaffe's Lost Transatlantic Bomber" by Robert Forsyth and Eddie J. Creek, produced by Chevron Publishing Limited, printed in England by Ian Allan Printing Ltd, Hersham, Surrey KT1 2 4RG, first published 2006, ISBN 1-903223-65-2.
Alongside with this, a few times I check figures against what's to be found in "Waffen Arsenal Band 139 - Deutsche Fernkampfflugzeuge der Luftwaffe" by Manfred Griehl and Joachim Dressel, Podzun-Pallas-Verlag 1993, ISBN 3-7909-0450-3.
Time for another screenshot.
This is damage model testing. As you can tell from the turret positions, this poor Me-264 was pretty busy defending itself:
Mike