Depends on what resolution you want to play at.
I run Ghost's at 1080p maxed out and I get frame drops, lag, stutter, 1 hit deaths, 1 hit kills and loads of other issues that I don't get with any other game.
I am running Ghost's on the following pc specs.
Intel Core I7 3930K (overclocked and not overclocked makes no difference)
MSI X79A-GD45 Plus (Did have a Rampage IV Extreme but it died)
16Gb Corsair Vengeance 1600Mhz CL8 ram
2x Gigabyte GTX780Ti's in SLI Nvidia Reference Cards (tried overclocked and not overclocked and it made no difference)
Samsung 840 Evo 500Gb SSD (had 2 Corsair Force 3 240Gb in Raid 0 made no difference to loads times)
Here are some of the videos I have recorded, ignore the gameplay score wise etc because it's crap but just look at the game itself.
Call Of Duty Ghosts August 2014 Still Just BAD!!!!! - YouTube
Call Of Duty Ghosts July 2014 Still Just BAD!!!!! - YouTube
Call Of Duty Ghost's PC Lag 4 - YouTube
There are more videos on my channel showing just how bad Ghost's is, I have got to get some Crysis 3 campaign videos uploaded as I don't like the multiplayer aspect of the game, but on my channel there are some COD 4, MW2, MW3, BF4, Titanfall videos and all of them show just how bad Ghost's is.
The specs for this game are about the same as for Ghost's and I fully expect Advanced Warfighter to be the same as Ghost's when it comes to the PC version of the game, and since there can be no beta of the game released and no real "public" players get to play the pc version, you won't know what it runs like till it's released and then come back to the forums and see what people are saying.
The specs apparently however are as follows.
• OS: Windows 7 64-Bit / Windows 8 64-Bit
• Intel® Core 2 Duo E8200 2.66 GHZ / AMD Phenom X3 8750 2.4 GHZ or better Recommended: Intel® Core i5 – 680 @ 3.6GHz
• RAM: 6 GB RAM Recommended: 8 GB RAM
• HDD: 40GB HD space
• NVIDIA GeForce GTX GTS 450 / ATI® Radeon HD 5870 or better Recommended: NVIDIA® GeForce GTX 760 @ 4GB
Activision claim these are incorrect but, I honestly think that they are nearly spot on as they are not about to say you need the following to play it smoothly at 1080p, and although apparently it's got a "NEW ENGINE" it will stick look like a game from 5 years ago and still play like Ghost's does because the developers don't have any interest in the PC version of the game.
Core I7 5960X @ 4.8Ghz/ AMD 9590 @ 5.0Ghz
32Gb 2133Mhz
50Gb SSD Space
Titan Black Triple SLI/ AMD CrossfireX R9 290X
That will get you the 91fps cap, around 90% of the time.
If anyone is wondering why I am on these forums, even though I am 99% certain that I won't get this game, well it's because I am keeping my eye on here incase there is anything said from Sledgehammer about a beta or Rentable Ranked Dedicated Servers that can be ran, the same as the COD 4 servers but I don't think I will ever see that from a Call Of Duty game again.