Hi there. I'm in the process of building a new system. This system is oriented towards excellent performance at a reasonably high cost, budget of 2000-2200$. requirements : excellent graphics performance 8800GTX FSB1333 on Motherboard - upgradability 800MHZ DDR2 SDRAM - 4GB Reliable power supply Upgradability, relative silence. Here's what I have settled on so far. MoBo : ASUS s775 P5K deluxe @ ~270$ CPU : Intel Core 2 duo E6850 @ ~335$ GPU : BFG 8800GTX OC @ ~606$ RAM : Kingston HyperX 800mhz 4-4-4-12 PC2-6400 (twice) @ ~169$ PSU : Enermax 620w modular @ ~ 185$ CASE : Antec p182 @ ~165$ that's about 1900$ ... then i'll need an extra fan, and i might change the cpu power supply. Depending. Now for the questions RAM : what I'd really like to do is fill only two slots with one kit of two 2048MB modules. However when I look at the QVL of the motherboard The kingston seems like the only logical choice. What do I need to know before I venture outside of the QVL? How do I make the difference between real incompatibilities and unscrupulous deals with memory manufacturers? What would the performance drop be like if i went for cheaper PC2-5300? CPU : The quad Q6600 is still a on the side of my head. Any opinions? How noisy are the stock fans on these processors? would you recommand changing it to, say, something sexy like the Coolermaster Mars or something efficient like the Thermaltake BigTyphoon? GPU : another noise question : are there viable and safe fan alternatives? once again, how noisy is the stock cooler of the 8800GTX? Would changing the manually controlled tri-cool fans that come with the p182 case beinfit being changed for 3-pin MoBo-controlled silent fans like the thermaltake 120mm Stealthfan?