I have a dell inspiron 530S that I want to upgrade. It has vista basic 32bit and I upgraded the ram to 4 GB currently only using 3.4 due to 32 bit system. 250GB hard drive. Intel pentium dual core 1.80GHZ and intel graphics family integrated video card. I want a better video card which one would fit? Without me needing to upgrade the PSU. I also would want to know if the CPU would bottleneck or if I could replace the CPU is a C2D or a C2Q?