Nvidia 9600 GT

well 533 ram is barley any upgrade over older ddr ram i personally run 800 mhz ram in mine and also you cant tell a difference once speeds exceed 1600 mhz ddr 2.
 
well 533 ram is barley any upgrade over older ddr ram i personally run 800 mhz ram in mine and also you cant tell a difference once speeds exceed 1600 mhz ddr 2.

DDR2-1600 !!!! What the hell are you smoking ?
I don't think I've seen DDR2 pushed past 1200 very often. I managed to get 2 x 2Gb Crucial Ballistix from DDR2-800 to 1180 on an EVGA 680i (unlinked memory) and that took a bit more than their rated voltage to achieve.I have seen a set of Crucial DDR2-667 do close to a 100% overclock...but 1600, well that's something else entirely...
 
Can you please explain to me what is the difference in matter of speed ( Where can it be noticed)?

Faster RAM speed doesn't necessarily equate to anything other than small percentage differences in benchmarks- you won't see any real-world differences between DDR2-800, DDR2-1066 and DDR3-1333 for example.
Good DDR2-667 will achieve 1000+ MHz but at the cost of more relaxed timings. I would concentrate more on the the voltage required to run the modules (1.8 volts is standard and gives room to overclock/tighten timings (reduce latency), while cheaper lower performance modules run at 2.1 - 2.2 volts) and the latency - usually expressed as "CAS" or "CL" (or occasionally just "C"). For DDR2-667 a CAS/CL of 3 is good, 4 is ok. For DDR2-800/1000 then 4 is good, 5 is average/poor. Most DDR2-1066 is rated at 5 (and can run at DDR2-800 at CAS 4).
In most situations (other than benchmarking) there is very little to distinguish between DDR2-667 CAS/CL 3 and DDR2-1066 CAS/CL 5 for example. Be aware that good 667 RAM is mightily expensive while 800 CL4 is realtively cheap. Note that if you get DDR2-1066 your motherboard will have to support XMP or EPP profiles for it to work "automatically" or you will have to configure the timings manually.
 
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