Choosing 2x 4870 or upgrade

[ducuiuc]

Hi everyone,
I'd like to up the oomph on my computer in terms of gpu.
Currently i like to play Battlefield Bad Company 2 and Call of Duty Black Ops.
I don't usually buy very new games but i will be ordering Battlefield 3. (usually i pick up a
game on steam if its for sale and usually its older.

So my concern is this:

I have these specs:
GIGABYTE GA-EP45-UD3P LGA 775 Intel P45 ATX Intel Motherboard
SAPPHIRE 100259L Radeon HD 4870 512MB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card
Intel Core 2 Duo E8400 Wolfdale 3.0GHz 6MB L2 Cache LGA 775 65W Dual-Core Processor BX80570E8400
G.SKILL PI Black 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model
ASUS VW224U Black 22" 2ms(GTG) Widescreen LCD Monitor w/ HDCP Support 300 cd/m2 1000:1 (ASCR 5000:1)
CORSAIR CMPSU-750TX 750W ATX12V v2.2 SLI Certified CrossFire Ready 80 PLUS Certified
Vista 64

Should i get another 4870 or 4890 cheaply to run in crossfire or is a generation or two upgrade a much better fit?
Another Concern is whether my cpu will hold up to the task of do either option.

Budget: I could get a 4870 around $40-60 but I am very weary on purchasing an upgrade that will cost me
in the $150 range.

Priorities: Prep for Battlefield 2 and cost efficient
Having the baddest gpu just to have it is not a priority.

Thanks everyone for your time,

Dan
Chicago, Illinois

 

[ducuiuc]

What would be the MOst i should pay for a used HD 4870 512mb?
What if I got a 4890 for about the same price even though they probably wont be the same memory size will that be any better, same or worse?
thanks again

 

[ducuiuc]

So im confused. will getting another 4870 512mb help me much or not. i have not made any purchases yet so no worries.

 

[benski]

If you can get another 4870 at that price go for it, at your resolution 512mb won't be that much of a limitation and it will give you close to twice the FPS in some situations and at least a 50% boost in most.

Some games are already using more than 512 mb, BF3 may end up being one of them, but for 40 bucks what the heck it's bound to help some

 

[ducuiuc]

thanks guys. I'm sry to be a nit picker but id like to have a maximum amount i should offer for the 4870 512mb.
I was thinking 65-70, as anymore and i should just upgrade right?

 

[ducuiuc]

i just got a 4870 512mb for 50$ plus 10$ shipping so hopefully when installed it is full of win.
Thanks