Please guys read, your system for COD

[GOZR]

You should consider this as a new system for example that is cheap and kill everything you own atm.
 The i7-2500K coupled with Asus P67 Pro  or equivalent for 150 $ and you just need 8 GB PC 1600 1.5v ( 2x 4GB ) or even cheaper just 4 GB is very ok no need for 12 or 16 GB
 You must have a 2 GB video card  something like the ATI 6970 is a very very strong card that will run COD better than the 560,570.. or even the 580 GTX 1,5 GB.
This is if you buy something new today.....

But COD is not as much CPU intensive that expected so a quad will run the Sim pretty well even an Q6600 above 3.0GHZ will do well so imo before upgrading your whole system FIRST you should consider buying a 2 GB Video cards  and try on your actual system as is.

If you find now some used parts it would be great AMD quad or six cores, Q6600, Q6700, Q9400, Q9550, Q9650 and ANY i7 like 920, 930 etc are great!!! Many are for sale used for cheap. get 4 GB or 8 GB ( Dual channels on Q9**** and i7 2*** CPU's ) and it's enough or 6 GB on older i7 system for tri way channels (3x 2GB ) Just try to stay cheap cheap now choose a mother board that is not expensive and use if you can as well but many are not expensive sub 200 to 150 $ new ------ What you need the most is the Video card The sim is texture Video ram eater ..  you can have SLI 580's with 1.5 GB and just a single ATI or Nvidia with 2 GB or 3 GB will kill the less Vram card and you will enjoy MUCH more the sim, That true for FSX sim the same way.
Now Dual GPU with 4 GB for example like the latest ATI will be not be a real 4 GB but a 2 x 2GB so it is not worse it.
Having used part will be much much cheaper and you could change your PC little bit more often and keep up with out killing your piggy bank

[TX-Gunslinger]

You will, it appears be able to use SLI or Xfire.

Same with ROF.

Me - I'm thinking about ASUS P8P67 WS REVOLUTION LGA 1155 Intel P67 / NVIDIA NF200 SATA 6Gb/s USB 3.0 ATX Intel

to go with:

  Intel Core i7-2600K Sandy Bridge 3.4GHz (3.8GHz Turbo Boost) 4 x 256KB L2 Cache 8MB L3 Cache LGA 1155 95W Quad-Core Desktop Processor BX80623I72600K

and adding another 5870 for X16 X 2.  I can get 5870's still for cheap.

On the other hand, my rig is running everything fine - 40-70-80 CoD.

S!

Gunny

[GOZR]

Yes i wanted the Revolution as well and settle for the Evo due to the lag caused by the NF200 not native, The 2600K i do have it 24/7 4.8 GHZ was at 5 GHZ but summer is coming and no difference. FSX now run as well as IL2  just nuts.. ROF is also a huge step forward in ROF FPS .

Yes the SLI will be on COD they MUST!!!! SLI is the best way but remember if you are going native in resolution and i assume you will want to same as me , 1 GB  on each card wont do it as i was singing this to the FSX crowd and same as you can see on ROF Vram load ..  I'm serious about that ..  1 GB + 1 GB doesn't do 2 GB in SLI systems but just 1 GB.. each frame take the 1 GB buffer it help if we are going SPLIT frame..

I would do in your case is getting the 6970 2GB to start and sale ASAP the your 5870.. ( 1 GB ? ) But like i said above it maybe the best way to do is to get the Video before all since the Q9650 is a great chip apart with I7 920..

The Vram at 2 GB will give you a buffer for smoothness and mostly with the upcoming extra skins and maps and ONLINE fights..  and we want smoothness..