Only the x64 build can support 2048 MB FBWF Cache size.If 2048 Mb is chosen for the x86 build, the cache size will be set to its maximum 1024 MB.
I added fbwf-2048.cfg in addition to the choice for 2048 MB FBWF Cache size.With a messaeg when selecting:QuoteOnly the x64 build can support 2048 MB FBWF Cache size.If 2048 Mb is chosen for the x86 build, the cache size will be set to its maximum 1024 MB.Let me know how it works ? Why do you need so much ? (Attachment Link)
I added fbwf-2048.cfg in addition to the choice for 2048 MB FBWF Cache size. (Attachment Link)
Just testing a 1.1GB iso build all in ram - still have 1.3GB of free space..
Well you can try to increase it and check what happens,but according to Microsoft it's range have to be between 16MB and 1024MB.