Quadro FX 4500 not recognizing all memory

[AL1630]

I have a PC Quadro that has been flashed, and my 1,1 recognizes it, but is says 'Quadro FX 4500 256MB', but this is a 512MB card. Is the missing memory likely to be a problem with the flashing, or could it be something else?

 

[h9826790]

Flash a wrong ROM can cause this issue.

 

[AL1630]

So if I find the correct ROM and reflash it, it should work?