1) Does the number of sticks you have make a difference? I ask because I saw a 8gb kit with 4 sticks that was much cheaper than one with 2 sticks, and the same for 4gb of ddr2. Does this mean anything, like more cards=worse performance? Should I buy an 8GB kit or buy sticks individually?
2) Is there any performance difference between DDR2-800 and the higher ones like 1066?
3) What exactly are timings? For example, I see RAM with 5-4-4-18, and one with 6-6-6-19. What do these mean, and what should I shoot for?
#1 over 4gb ram you need 64bit operating system.
#2 the motherboard has to support or limits the amount of ram
#3 in most cases stick with DDR2-800. For best results the fewer sticks the better like 2 x 2gb sticks vs. 4 x 1gb sticks. Also for best results choose ram that defaults at 1.8v and has a lower Column Address Strobe (CAS)
1-usually kits with less sticks perform/overclock better and are more stable
2-no, not worth it unless you overclock... like a crackhead
3-for ddr2 800, shoot for 4-4-4-12 or something really similar... or less maybe
ddr2 1066 5-5-5-15... those are normals