PCGH Tuning: Crossfire X performance boost for Call of Duty 4
With a little trick you can get up to 45 percent more performance out of the single-player mode of Call of Duty: Modern Warfare. At least if you use AMD's Crossfire or a Radeon X2 card like the Radeon HD 3870 X2 or the future HD 4870 X2.
To receive the benefit you just need to rename the single-player launch file "iw3sp.exe” to "iw3mp.exe”, which is the name of the multiplayer launch file of Call of Duty 4 - make sure to create a backup of the original multi player file first.
This enables the Crossfire AFR mode - in our benchmark level this is the case at least, since without it the Radeon HD 4870 X2 isn't much faster than a single GPU version. With this trick you can, depending on the settings and played level, receive up to 45 percent more fps in Call of Duty 4.
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Actually we cannot think of any reason why AMD doesn't activate the Crossfire performance boost for the single-player. Up to now we haven't received an answer to our inquiry about this matter from the Canadian GPU specialists.
Grafikkarten-Rangliste 2016: 32 Radeon- und Geforce-GPUs im Benchmarkvergleich [Oktober]