Need CPU & Memory upgrade help

I have a Dell Studio 1745-3691MBU, with HDMI, Service Tag:

I would like to know the manufacturer; Model number (example: Core 2 Duo T6600); Part number etc. of the following;

CPU – Upgrade to highest:   I believe the highest is the, Intel Core 2 Quad; L1 cache 256KB; L2 cache 1MB; L3 cache 8MB

Memory – Upgrade to highest:  8GB (2 - 4GB sticks)

Currently I have the following:  

CPU Currently Installed: Intel Core 2 Duo T6600 @ 2.2GHz   2.20GHz.

CPU’s Acceptable (per manual):

Intel Core 2 Duo; L1 cache 128KB; L2 cache 2MB/3MB/6MB

Intel Core 2 Quad; L1 cache 256KB; L2 cache 1MB; L3 cache 8MB

Memory Total, currently: 4GB (2 - 2GB sticks)

Memory Type (per Dell manual): 1067/1333MHz SODIMM DDR3

Memory Actually Installed: Samsung, 2GB 2Rx8 PC3-8500S-07-10-F2

Memory Slots, Total available: 2

I found this system board information on line but do not know if it is correct; DELL STUDIO 1745 LAPTOP MOTHERBOARD J502P 0J502P LA-5151P USA. If this is correct it doesn’t help me because this is a Dell mother board and Dell did not post the CPU and Memory information for this board as does other mother board manufacturers?

I would like to get this done before I purchase my next Laptop. Could you please help me?