BFG Geforce 9800 GT OC 1GB GDDR3 Card Video Ram Issue

OK, so I have a BFG Geforce 9800 GT OC 1GB GDDR3 card.

Now, onboard video memory is 1024MB, obviously. However, whenever I do dxdiag, it tells me that I have "Approx. Total Memory: 494 MB".

What the hell? That's less than half of what I actually have. I didn't actually notice this until today, when I went to play Prototype on my PC for the first time, and it wouldn't let me set my resolution to anything above 1024x768.

According to Prototypes read me, the resolutions are locked at certain levels.

Cards with less than 512 MB cannot access resolutions with widths of greater than 1280 or heights of 720. This means with a card of LESS THAN 512MB VRAM has these available:

640 x 480

800 x 480

800 x 600

1024 x 768

1152 x 720

1152 x 864

1280 x 720

1280 x 800

Cards with less than 1024 MB cannot access resolutions with widths of greater than 1600 or heights of 1080. This means with a card of LESS THAN 1024MB VRAM has these available:

The following are only available for cards with 512MB VRAM or more:

1280 x 1024

1440 x 900

1600 x 1200

1680 x 1050

1920 x 1080

1920 x 1200

2048 x 1152

2048 x 1536

2560 x 1600 Where is the rest of my VRAM?