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I recently started using the 256x resourcepack of Sphax and have never seen the used memory peak over 1GB.
I have allocated 8GB in total which seems unnecessary, but when I go to run the 512x version, even with 8GB of allocated RAM, the resourcepack continues to default, I have read the help thread and I am currently using version 1.8 on a clean Install of Minecraft.
My computer is currently running on 16GB of RAM and also Windows 8.1
Exactly how much memory does the 512x version need seeing as the 256x version isn't even peaking over 1GB??
I am currently not using MCpatcher nor Optifine.
The screenshot provided shows me running the 256x version and the Memory Used
(Had to post the Screenshot on an external site because the Image file was too large for this forum)
Screenshot: https://imgur.com/Uyz5ll4