CPU-Z, nvidia control panel/ntune, readings

CPU-Z 1.52.2
Is the core VID value supoose to change?
What does the multiplier do? (Currently x 8.0)
Bus speed is 199.6 MHz.... Where is this coming from?
Rated FSB 798.3 MHz.... This is the cpu's fsb!?

My ram is supposed to be ddr 2 PC2-6400 (800 MHz) but for some reason it says its DRAM frequency is 399.2 MHz.... is it not suppose to say 800 or is it just 800/2.....
also it says fsb:dram 1:2 ..... what does that mean?
My cas latency is 6.0 clocks.... so i got CAS 6 stick? 6-6-16... = good/bad?
Under SPD tab in the timing tables, the cas latency changes from 4,5,6 respectively from jedec 1,2,3. whats this mean?
also the frequency increases #1-266MHz #2-333MHz #3-400MHz

Under the graphics tab, memory section it claims bus width of 64bits... is that right? (thought it was 128, 256?)
technology claims 80nm instead of 65nm!?!?!
also in notebookcheck.net it claims to have clocks of
core: 640
shader: 1600
memory: 700
but mines are 580/1450/400 respectively? is that their OC?

nvidia control panel under peformance:
geforce video is 185.77. i know 186.61 is out but for some reason i cant install it.
also it claims that my cpu core frequency is 1597.046MHZ instead of 1400MHz... whats up with that?
also for core speeds 580/1450/400 i can clock the speeds for a custom set up. last week i tried the 640/1600/700 and the fans kicked on and stayed on when the laptop is on. how safe is it to keep them in the high clocks.

 

Yes, the core VID value can change. The voltage changes with the multiplier. Intel's Speedstep controls the multiplier based on the CPU usage at the time (mine goes from 6.0x to 7.0x to 7.5x, and from 0.93V to 1.138V as the usage changes).

Yes, DDR 2 memory at 400 MHz = 800 MHz. I don't know what the fsb:dram ratio is.

Below the given speeds are the latencies at which the RAM can run safely. At lower speed, you can get lower latency (= faster access time, but lower bandwidth). You should stick with whatever the memory comes with (in your case, 400 MHz).

The G105M does actually have only a 64-bit memory interface.

You can probably OC to 640/1600/700 quite safely since these are nVidia's reference clocks for this card. The memory change from 400 MHz to 700 MHz will have quite an impact on temperature, so you may want to keep an eye on those.

The GTX 260M in ASUS' G51 series is also factory underclocked to 500/1250/800 from 550/1375/950 MHz.

nVidia's System Information CPU core frequency is notoriously inaccurate (it doesn't read FSB properly). On my computer, it shows anywhere from 2300 MHz (actual speed) to 5727 MHz.

 

CPU frequency = multi * real FSB

This is your real FSB.

This is the rated FSB, not real FSB. Since most intel CPUs have a quad pumped FSB, it shows ~800mhz when the real FSB is ~200mhz.

That's just the fsb:dram ratio. So (200mhz FSB) : (400mhz dram) = 1:2.

The SPD is where the info about the ram is written.
The info you see just shows the different timmings and frequency the ram is capable of running.