The last upgrade

Five years ago I picked up an Acer Aspire 5100-5840, it came with a AMD TL-52, 2Gb of ram, and a 250Gb-5400rpm-2Mb Cache hard drive.
I first added the 4Gb of ram, the a 320Gb-7200rpm-16Mb Cache hard drive, upgraded to Windows 7, and finally today I added a AMD TL-62 processor. It had been three years since I had made any changes to the notebook, there is always something else that needs to be done.
All combined the upgrades netted a HUGE performance boost. I did it over the last three years, when the parts became affordable. The only thing I can't upgrade is the graphics performance. The computer can allocate 512Mb of ram for the graphics processor, but for the life of me I can't figure out how to adjust it? The highest setting I can see is 256Mb? So no way to increase that.
The computer has been enjoyable to use, no major problems at all, I haven't even had to do a system restore yet.
There are a few tweaks I'd like to make, but for the most part I am done. I need to find out how to adjust the video performance, the "last" thing to be done

Me!