Bottlenecking, yesno?

[Jiniix]

My littlebrother currently has this PC:

• AMD Athlon 64 X2 6400+ Windsor 3.2GHz
• 4GB (4x1GB) DDR2 800MHz
• M3A32-MVP Deluxe
• AMD Radeon HD 5770 1GB
• Samsung 320GB (320GB/16MB/7200RPM)
• 750W PSU

Would I bottleneck the CPU by adding another 5770?
It's running BF3 on a 1600x1200 monitor at medium-high, and I was hoping to make it run smoothly at ultra.

 

[spirit]

You may see a CPU bottleneck if you throw in another 5770 - the X2 6400+ is quite an old CPU. Even if you did put another 5770 in, I doubt you'd be able to play at Ultra, two 5770s isn't the strongest setup.