|Max out the ram and invest in a decent graphics card.|
Memory Installed 512 MB
Maximum allowed 2 GB (2 x 1 GB)
Speed supported PC-3200 MB/sec
Type 184 pin, DDR SDRAM
You have a PCIe X16 slot for a graphics card. You can achieve your main requirements without replacing motherboard & CPU.
The only thing to look out for is the powersupply and whether the original unit is sufficient to drive a decent graphics card..
This one has a relatively low power requirement @ about 50W which is less than 5 amps on the 12V rail.
Goin' Fishin' (Some day)