i have this PC currently
cpu : athlon ii x3 440 3.0ghz 1.5mb l2 cache
motherboard : gigabyte ga-880gm-usb3
ram : 2 x kingston 2gb ddr3 1333mhz dual channeled
GPU : Radeon 4250 built in
i am planning to get a sapphire radeon hd 7850 1gb
will there be a huge bottleneck by the cpu should i upgrade to an i3 with b75 mobo and get a 550ti instead which will give better performance
A little depending on your games -- maybe a lot in a game or 2 that is really CPU heavy.
Clock-for-clock an AthlonII will perform about 5% slower than a PhII -- a light 10% in those CPU intensive games...
Two thoughts: Gigabyte motherboards are bad to over-volt with Vcore on **Auto** and with DDR3-1333 your sweet spot with the system clock is 250MHz
You should easily be able to run 14x250MHz with good air with 1.3875v or so.
That will give yah a nice boost