Worth Upgrading?

[JoulumanteliW]

Okay, so my current build is

Am2+ motherboard
Amd phenom 9550 @2.2ghz
HD3850 1GB

And I am upgrading to:
*HD4870 1GB
*New motherboard?
*New Processor?

As far as I know that processor is bottlenecking 4870.

Is it worth buying
Am3 motherboard (M4A78-E)
AMD phenom II x2 550 @ 3.7Ghz around?

How big that difference is from 9550 to x2 550 @ 3.7?

EDIT: Oh, and thats a gaming computer, not 3d modelling or anything.

 

[JoulumanteliW]

@95thrifles, No I really need mobo update. My current one is some acer's random motherboard, I can't even overclock with it.

So basicially I am buying whole new computer (case, psu, 4870, processor, mobo)
But I got rams, DDR2 and a dvd-rw drive.

And 'bout that DDR3, no there are a lot of good mobos with am3 support and ddr2 memory. I don't have money to buy DDR3 rams yet.

That mobo M4A78-E has Amd 790FX chipset and good features.

@McstylisT, No I do not have bought that card yet, and yes I am aware of new 5800's. But we don't know when they'll be coming. EDIT: Fail? They're being released 28/09/09 or did I read wrong?

Anyone knows games who take advantage of multiple cores?