I always believe that building a system with balanced specs is the ultimate rule. But it's not all the cases, at least for a gaming rigs as long as you play games on high resolution or big monitor. In current pc hardware market, where 22" 1680x1050 wide screen can be easily available with entry level prices, and if you want playing games with all the eye candy turn on, then it's no problem to plug in a 8800GTXs with low end CPU or 1GB of RAM!.
Tomshardware
And for general uses - gaming, DVD watching, listening to music, internet surfing, or a little word processing, i think the system still run great as long as not movie graphics editing programs.
Let's get down to the results! Does a low cost PC equipped with an 8800 GTX stand a chance when pitted against a strong, balanced midrange system with an 8800 GTS? Will the low-cost PC's meager 1GB of RAM and slower CPU prevent it from keeping pace with the midrange system? Let's see:
In 1600x1200 with 4xAA, our Budget Gamer's Special is trumping the mid-range system.
This is a highly specialized case - I don't think I'd ever recommend such an unbalanced system to anyone - but it makes a point that can't be ignored: for high resolution gaming, even the 8800 GTX is a viable card for a low-end dual core system.
Tomshardware
And for general uses - gaming, DVD watching, listening to music, internet surfing, or a little word processing, i think the system still run great as long as not movie graphics editing programs.