Upgrading cpu and ram

[Benn3856]

Looking for the info on what cpu i can upgrade to and the Ram for my HP Pavilion a6417c PC 

Prod #: KJ402AA#ABA

[edit]

Oh so what power supply is okay to upgrade to use a 6 pin graphics card in it cause the power supply did not come with one for a video card

[wb2001]

@Benn3856,

Your asking about an unit that will be 12 years old in March.

1) It will not support modern graphic cards, nothing about the GTX 660. The GTX 670 is a dice-roll.

2) Any standard ATX PSU will work,  The CorsairCX450 will work, and is an exact fit. That 5.5" length is critical, a longer depth PSU could strike the CD/DVD drive cables.

 3) RAM:

You have a 2GB and 1GB modules. That is a lousy configuration. The unit runs in dual channel mode, so it needs matching pairs in the channel to perform efficiently.  As the MAX is 8GB total, I suggest you toss out the current modules, and put in TWO of these pairs.  That will give you 2-2-2-2 or 8GB.   (2x$63).

Here is the support page, from this link you can determine CPU and RAM.