2 x 4 GB or more and CPU/GPU Upgrade in HP RP5700 Business System

[Giants_1]

I need your help.

Thanks to this website, I upgraded my old Dell XPS 210 from 4 GB to 8 GB using 4 x 2 GB RAM chips and found a cost effective E6700 Conroe to upgrade (the Q6700 and Q7700 were not that much faster and cpu-upgrade gave them 70%ish chance of upgrade vs. E6700 with a 96% chance of upgrade, which worked!).

I'm now asking about a similar era system, HP RP5700, similar to this:

https://www.cnet.com/products/hp-compaq-business-rp5700-core-2-duo-e6400e-2-13ghz-2gb-ram-160gb-hdd-vista-business/specs/

Instead of buying four 2 GB RAM chips, I want to save money and buy two 4 GB DDR2-6400 RAM chips to upgrade from 4 GB (4 x 1 GB already installed) to 8 GB. Is that possible? Can I go to 10 or 16 GB on this system?

Also, the unit has a Celeron 440/Conroe, though the reviewed system uses a Core 2 Duo E4400e. Can I upgrade the Celeron 440 to another Conroe, a dual core E6700?

http://ark.intel.com/products/27251/Intel-Core2-Duo-Processor-E6700-4M-Cache-2_66-GHz-1066-MHz-FSB

It has an integrated Intel GMA 3000 Dynamic Video Memory Technology 4.0, 384 MB of shared memory, 64 bit, DDR2 at 400 MHz. I'd like to buy a half-height graphics card to upgrade to play FSX and air combat from the 2005-2088 era. Is that overkill (no pun intended) to upgrade? What are some inexpensive graphic cards that would fit?

Thanks as always

 

[penguintech]

Max RAM for that unit is 4x2gb for a total of max RAM of 8gb. each slot is only capable of running 2gb stick per slot. You would not be able to get it to read 4gb per slot.
Celeron 440 is a Slot 775 as well as the E6700 is Slot 775. based on the Q963 Express chipset on these systems, you should be able to easily upgrade from the Celeron to the E6700.

for basic old school gaming Gigabyte GeForce 210 GV D3-1GI Low Profile Graphics Card - 1 GB DDR3 - 64-bit - 520 MHz would suit your needs. New they run about $30 (US) or I am sure used on eBay for much less.