My system consists of the following:
AMD Phenom x4 II 925 (2.8 GHz quad core)
8 GB RAM
Windows 64 Bit
My power supply and Motherboard are adequate enough.
Using the following information, does the GPU match up with the processor, or is it bottle necking my system? I primarily game on my computer, and running into frame rate drops and running games like Saints Row 3 on medium sort off pushes my system... so what could I do to upgrade my system and improve frame rates in games?
I gave you a few suggestions on both the low end and high end of the spectrum with respect to your budget.
All three of these cards are strong performers. I believe the 560ti would be the happy medium unless you grabbed an overclockable version of the 6870. Then you may be able to surpass the 560ti. The hd 7870 is worth every penny in my honest opinion. Depending on what kind of games you play, you wouldn't be disappointed in its purchase either.