How can i make my PC a more powerful gaming PC?

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The 7750 would automatically be the favored GPU, I don't think you'd have to do anything. Dual channel Ram is not very important when not using the iGPU, but it will perform a bit better if you don't use 10gb, which you probably don't. As for the 7750, you should get 60FPS on medium on BF3 with that resolution. The old COD games should run on high then I guess. What I'm trying to say is that its quite a significant upgrade.
 


alright man thanks, i will remove the 2gb ram, i want to get as best performance as possible, and i will proceed to buy the radeon 7750

 
IMPORTANT!! The AMD Dual Graphics Solutions do not work as advertized, the single card infact runs better than the Dual graphics solution. Hence I would not recommend to go for the Dual Graphics at all. Better buy a better card instead. The dual graphics does not help with the performance. It mostly just increases the amount of skipped frames which will make gaming worse

It is also not recommended by the TomsHardware team even. Look for the review at http://www.tomshardware.com/reviews/dual-graphics-crossfire-benchmark,3583.html


I hope this helps.
 


DDR3 will result in worse performance because it is slower RAM.

I have not seen any benchmarks comparing the HD 7750 DDR3 vs. HD 7750 DDR5. But the Radeon HD 6670 DDR3 only has about 76% the performance of the Radeon HD 6670 DDR5.