17155: Initblkmem: not enough memory for memmap structures

the server: 4 - 200 PP, 1.8 Gb mem, 2 Gb pagefile

this happens after the memory is configured for ( sp_configure 'memory', 600000 ) for
the sql server.

it was working fine for ( sp_configure 'memory', 500000 ).

is there a limit on how memory can be configured sql server ?

i can start the server with (-f ) but i can not reconfigure the memory.

Thanks