You can only add as much ram.as your motherboard can suport and your mobo also is what will alow you the ability to add a second gpu .

Idk if it's even worth upgrading... I think a new mobo and processor would be a better upgrade really.... You can get Core 2 Duos or Atlon II X2s for pretty cheap now... And a micro ATX board (Atleast AMD) which is AM3 with DDR3 ram shouldn't be too expensive.... In fact, I'll list you a nice budget PC.... If you want to game, the on-board GPU on an AM3 board (Usually ATIs 4250s) can game quite a bit... For CoD they're priceless, they can easily max out the game 1280x720 at 27+ FPS per second. (Shadows off)

http://www.newegg.com/Product/Produ.....82E16813157199 < AM3 Board
http://www.newegg.com/Product/Produ.....82E16819103896 < AMD Athlon II X2 @ 3.1ghz
http://www.newegg.com/Product/Produ.....82E16820231274 < G.Skill Ripjaws

Total Cost: 142.99$ It's worth every peny... Once you get more money, you can get a new GPU if you're interested in heavier gaming, the onboard will suffice for light gaming and everyday use, HD movies are a breeze to it... So no worries there.

If you still must...

First, you can't dual GPU it.

Second, even if you could, it'd be bottlenecked by the Pentium 4

Third, no you cannot add more ram if your board doesn't support it, it'll probly not boot and if it does, it'll only recognize the max ram the board supports, plus I believe P4s can't do 64bit, sooo... Yeah.

Actually mine's a 5th-Gen Pentium(R) 4 with HT, and it has EM64T so yeah, you can run x64 on it

Eeeeh.... Still... P4s are just stupid slow... They stutter A LOT, and I imagine 64 bit will just make it worse.

You'd be better off building a new PC than upgrading that... Unless you really truly need it.... It's really outdated.

Yep, BIOS Date: 4/4/2006

Upgrade bro... IT's truly very old. XP

The latest update was released on the 24th, same month, same year -_-

http://www.dell.com/support/drivers/us/en/19/DriverDetails/DriverFileFormats?DriverId=R121070&FileId=2731114635

The 64-bit OS runs a lot smoother than the 64-bit version. It's like using a new one every time. the 32-bit starts fucking up after a month and a half

Errm.... I've only used 32bit omo

Never had one fuck up... Unless you install a bunch of random programs that fill up your startup menu...

I currently have Windows 8 Developer Preview 32bit, it's been runnin for 3 months... Still feels as fast as the first day I installed it. owo

Oops, mistyped that. I meant, "64-bit runs smother than 32-bit" how redundant of me

It does on higher powered processors... Trust me... My Athlon 3800+ (Which cranks in maaaaaany more cycles per clock than your Pentium 4) lagged pretty bad on a 64bit OS on games that I played previously and quite smoothly on a 32bit OS.

Yes I used to game on a single core.... ATi 4550.... And WoW (Tested) Did 21fps on med high (64bit) and struttered liek hell while on 32bit it did a healthy 37fps and didn't even skip a beat.