Finally my dell inspiron 530 quadcore has arrived. Fortunately for me the minimum PSI required for quadcore is 350 w, which makes it compatible with eVGA 8800GT PCIe card without replacing the standard PSI. However the standard PSI is using only sata 15-pin power and 8800GT is using two 4-pin molex to power its GPU. In addition to that, if you order your spec like me, 1 DVD rom + 1 Harddisk, you will only have 2 sata power left that you can use.

The following is the extra cables/extentions I bought to make it work:

A1. SATA 15-pin M molex to 4-pin F power adapter

http://microcenter.com/single_product_results.phtml?product_id=0281713

A2. 4-pin Molex Y Power Cable

http://microcenter.com/single_product_results.phtml?product_id=0260708

After you got everything setup, do the following to install your 8800GT to Inspiron 530

1. Turn off your computer and unplugged it from the wall

2. Disconnect all connections from your desktop, then open the case.

3. Plug the 8800GT to the only PCIe slot (#25 on the diagram below)

http://support.dell.com/support/edocs/systems/inspd530/EN/OM/parts.htm#wp1184332

4. Connect the 15-pin molex to 4 pin converter (A1) to the one of the SATA power either from harddrive or dvd rom

5. Connect A1 to A2 and then connect A2 to the Y cable from your 8800GT

6. Close the case, connect the monitor cable to the new card, plug it back in, and boot up.  The system should see the new hardware. 

7. Install all of the driver that came from the CD, or download the latest version fron nvidia website

http://www.nvidia.com/object/winvista_x86_169.25_whql.html